Here's some back of the envelope math for batteries and ships:
- Weight is less of a limitation than you would think. Ship size is measured in tonnage. 40K-60K is a medium sized cargo carrying ship. So lets assume a ship like that.
- Battery weight calculations are going to be key. If you assume 170 wh/kg, 6 tonnes of battery equals about 1 mwh of battery.
- Energy usage of ships is speed dependent and it's a non linear relationship. You can save a lot of energy by going a bit slower. Going about 15 knots, a ship like this might use 15mw of power.
So the math becomes something like 6 x 15 = 90 tons of battery per hour. 5000km is about 2700 nautical miles (1 knot == 1 nautical mile/hour). So, you need about 180 hours of battery. Or about 16200 tons for a total of 15mwh x 180 = 2.7gwh of energy. That's a big battery.
The real limitation here comes from the cost of the batteries, which is dropping fast with sodium ion. The reason CATL is bringing this up is because they've been doing similar math with some informed $/kwh math. If they can get it down to around 20$/kwh, a mwh would cost 20K, and a gwh would cost 20M. So the battery would cost 54M$.
The key here is that this is still assuming 15knots. Energy usage might drop considerably if you drop it to 10 knots or even lower. You might only need 7200 tons of battery at those speeds.
The ship can handle the weight either way, though you are sacrificing useful load of course. The real constraints here are cost and speed. You pay a fat premium for a fast ship. Of course ships this size aren't cheap. A few tens of millions is normal. And they burn through many millions worth of fuel per year too. So, even though that amount of battery is expensive, the math might actually work out to these ships being cheap enough to operate that they'd earn back their battery.
You'd have to be pretty bullish about cost and performance of batteries. But CATL clearly feels that way. They have several battery chemistries at their disposal with higher densities (and cost). Over time, batteries might get cheaper and more dense. Ship designs might be optimized for batteries (e.g. structural hulls with battery). There's a lot of wiggle room here. But it's not an impossible proposition.
pjc50 2 hours ago [-]
The one technology that I thought might work really well here is flow batteries. You need a couple of sets of tanks, but then you can do charging by pumping out the old electrolyte and pumping in charged electrolyte. But these seem to have stagnated, possibly because they're dependent on expensive short lived membranes.
I wonder if there's significant scope for offsetting electricity consumption by adding deck renewables. Not for container ships, but maybe for tankers .. which are only needed because of fossil fuel consumption elsewhere. Hmm.
jillesvangurp 24 minutes ago [-]
The main obstacle here is the energy density of those is much lower. We're talking 20-30wh/kg. So you would need about 7-8x more mass compared to a 170wh/kg battery. For ships like this (capable of 5000km), the tanks would take up most of the ship with barely any space for useful load.
Otherwise, it's not a bad idea as you could pump the pre-charged fluids in/out and even ship the fluid around with tankers; which opens up the possibility of fueling at sea. Spills would be bad. But probably better than oil as the toxic fluids dilute more easily. But it would still be a bad day for marine life. It might work for shorter ranges.
pzo 3 hours ago [-]
I think another problem is how fast you will be able to charge such a huge battery and how expensive such ship battery charger will be and if you expect to have such charger at most ports (ideally for every docked ship). Will you even need a power plant at every port?
jillesvangurp 3 hours ago [-]
You'd need big batteries in the port to act as a buffer and enough energy to charge those in between when no ships are docked. But the ship would be there for quite some time (up to a day or even more). So a few tens/hundreds mw of power would go a long way.
You'd probably want to use a mix of local wind/solar power and a grid connection. Of course, harbors usually already have lots of infrastructure to power heavy industry (steel, refineries, etc.) and transport (e.g. rail). This just adds to that.
There are also other solutions including using container batteries and simply swapping in fresh ones. Which especially in a container harbor shouldn't be that big of a deal.
loandbehold 3 hours ago [-]
Charging big battery takes the same amount of time as charging small battery if charger's power is proportionally larger. E.g. charging Tesla at Supercharger takes same amount of time as charging phone using fastest phone charger.
pzo 2 hours ago [-]
I don't think you can just take tesla supercharger and scale it that easily to use in ships. You have to think how thick charging cables you have, how many of those you need to connect to your ship, how heavy they are, how long they are, how much heat the generate. Remember such battery would be many orders of magnitude bigger than in tesla. Tesla charger cable is many times order thicker than your usb charging cable. Now imagine many times order thicker ship charging cable and how heavy it is, how less elastic it is, how much heat generates, how much isolating cover needs (for heat, protection, magnetic field).
i_am_proteus 47 minutes ago [-]
Yes, this is true. Realistically, a "charging station" for a ship this size would have a large pierside structure to transform/regulate, and a very large cable array that would probably be moved to the ship via a crane. The connectors would almost certainly require manual fitup and the operation would require several personnel.
(Similarly, refueling a ship is substantially more complicated than refueling an automobile.)
Maritime engineers and workers can get this job done.
_fizz_buzz_ 21 minutes ago [-]
You could increase the battery pack voltage and/or charge several packs in parallel. Why not have 20 charging cables. Shouldn't be a problem for a ship. Would of course be fairly inconvient for a car.
londons_explore 1 hours ago [-]
Scaling won't be hard - worst case you could just install 1000 250 kilowatt superchargers on the dockside, plug them all in and get 250 megawatts.
Obviously there are better solutions, but that solution demonstrates feasibility with no further engineering work required.
2 hours ago [-]
rgmerk 2 days ago [-]
OK, I did some calculations based on:
* a 5,000 km electric range.
* 40MW continuous power requirement for a 21.5 knot cruise speed[1] for a 14000 teu container vessel:
* the size and weight capacity for the batteries being the same as the fuel capacity for a 14000 teu container vessel (taking the upper figure from [2])
* the battery pack having similar gravimetric (weight) and volumetric(size) energy density as this a modern Chinese NMC EV pack[3]
The short version is that the battery vessel would require about 25,000 tonnes of batteries for a 5,000km range under those assumptions, which compares to the current fuel capacity of approximately 13,000 tonnes. Volumetrically, it's even closer - about 17,000 cubic metres, compared to about 13,000 for the bunker fuel.
Furthermore, it's worth considering just how much cargo the ship carries. One teu corresponds to about 33 cubic metres of cargo space (not counting the space taken up by the walls of the container), so the ship can carry about 462,000 cubic metres of cargo. So the additional space required to carry an additional 3,500-odd cubic metres of batteries corresponds to only about 0.8% of the ship's total cargo-carrying capacity.
I was surprised at just how doable this is, to be honest. What threw me is just how much bunker fuel ships can carry; if I'm doing the sums right, a ship like this can carry enough fuel to circumnavigate the globe a couple of times over. It may well make economic sense but it's not really necessary to have that kind of range to operate the ship safely.
Okay based on your calculation, here's a neat way to do this.
The battery capacity you have calculated needs about 500 shipping containers.
A large shipping vessel carries 24000 container. So make the batteries containerized, and easy to load/unload.
You could imagine pretty fast charging like this, and at some point in the near future using the same infrastructure with containerized nuclear reactors.
rswail 6 hours ago [-]
Why would you bother with the complexity of containerized nuclear reactors when you have containerized batteries that can easily be loaded/unloaded by standard port facilities?
ragebol 5 hours ago [-]
You can carry more cargo if you don't need all those batteries. If that difference makes economic sense is not yet known of course, as there are no containerized nuclear reactions that I know of.
mikkupikku 34 minutes ago [-]
> as there are no containerized nuclear reactions that I know of.
Even if you built one, as some people have proposed designs, it doesn't get you nuclear reactors you can just stack up on a ship or something. Containerized reactors could be convenient for getting a reactor to a remote site where it's needed but once there you'll have to provide substantial shielding for it; usually the way this is meant to be done in these proposals is digging a big hole and/or putting up earthen berms around it. And those earthen berms will be subjected to a lot of neutron radiation, so you need a plan to deal with the site after you run this reactor for any substantial amount of time; the whole site will be radioactive.
There's really no getting around this, and most of the people pitching container-sized nuclear reactors are hoping investors don't realize it. The amount of shielding that you could ever hope to place in an ISO container isn't anywhere near enough.
fooker 3 hours ago [-]
> as there are no containerized nuclear reactions that I know of.
Many in design, a few under construction, 2 in operation, by China & Russia.
My point being still: the economics aren't clear yet.
overfeed 5 hours ago [-]
To get paid more money for the additional +480[1] container capacity you gain over the ships life.
1. I'm ball-parking an onboard nuclear source would take up the equivalent displacement as 20-50 containers.
pandemic_region 5 hours ago [-]
What about the scenario where you just want to refuel? Shuffling containers around just to get the batteries out seems suboptimal.
fooker 3 hours ago [-]
Placing/moving containers for some specific loading/unloading goal has been a solved problem for a while.
You can imagine this needs solving pretty hardcore optimization problems.
CraigJPerry 4 hours ago [-]
Refuelling a cargo ship can take over a day. Quite a boring but well paid job.
How many kwh are you lifting at a time with a container? How many kwh are you pumping in the same period?
jadeopteryx 2 hours ago [-]
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Ekaros 1 days ago [-]
Thinking of charging is also interesting. What is the power requirement for that? If they use 40MW under operation, it means they must charge faster unless they spend at least as long time charging. So that capacity requirement can get quite high.
Workaccount2 8 hours ago [-]
Massive battery banks at the ports. Charging batteries off of batteries can yield incredibly fast charge times.
j16sdiz 5 hours ago [-]
> Massive battery banks at the ports.
These kind of infrastructure is not something you can build in 3 year.
You need more than one port having that.
jabl 5 hours ago [-]
Sure. Just like coaling stations and bunker fuel facilities didn't pop into existence with the snap of a finger either. Yet somehow they were built, eventually.
5d41402abc4b 7 hours ago [-]
>Charging batteries off of batteries can yield incredibly fast charge times
How?
Workaccount2 7 hours ago [-]
Batteries have low internal impedance.
A grid can do it too, but spiky 400MW loads are difficult and annoying for a utility. And the port, who would probably have to call in to schedule charging.
It's much easier to "trickle" charge a grid scale battery bank, which can then be used however the port wants whenever they want without upsetting the grid.
AnthonyMouse 2 hours ago [-]
> spiky 400MW loads
Ports can have 10+ container ships at once and unloading one can take multiple days. You're not surprising the power company with sudden loads, you're building a big power plant at the docks and then selling power to the grid during the part of the day when the price is high and charging the ships when it's low.
MengerSponge 6 hours ago [-]
Batteries are also already DC and easy to make arbitrarily high voltage.
I wonder what the "trickle" power requirement is? Knowing next to nothing about shipyard logistics... 20MW?
Ekaros 5 hours ago [-]
In the end, all those battery powered ships needs to be charged. So it is their total energy consumption split between harbours over some period. And as we are talking about trickling you could pretty much average it.
It likely will depend on patterns of harbour. Like how many ships visit, what sort of distance those go. And how much of total time is spend charging some ship.
Worst case is maximum distance trips and maximum utilization that is there being ship almost always being docked. Apart from times when docked ship change.
stavros 4 hours ago [-]
Batteries are, as an approximation, charged at 1C, so for a 40 mWh battery you need 40 MW.
beAbU 1 days ago [-]
I am really surprised that the mass and volume requirement for batteries are within the same order of magnitude as for bunker fuel for this task. I thought batteries were still lagging far behind!
Is bunker fuel energy density just that bad or is it something else? A 50kg tank of diesel can easily outperform a 200kg pack of batteries in an ev.
rgmerk 1 days ago [-]
Battery energy density is way behind that of bunker fuel, it’s just that cargo ships (at least as far as some googling suggests), have fuel capacity far in excess of what is required for a 5000km range.
conk 8 hours ago [-]
My guess is not every port can supply bunker fuel. It prob makes sense to load up when the ship is near a refinery and then make several trips before refueling.
beAbU 5 hours ago [-]
Ah, so what you are saying is we are not going to need to make significant compromises to the ship's cargo capacity, but we are impacting the total max range significantly? Is a fully fuelled ship capable of much more than 5k km?
acchow 6 hours ago [-]
But 5000km is shorter than many major routes, right?
Shanghai to Los Angeles is more than double that
Qwertious 6 hours ago [-]
The route length isn't important, only the longest distance between ports that you can recharge at. Cargo ships regularly slow steam (I.e. run the engine slow to improve fuel-efficiency) and stopping to recharge batteries at multiple ports to reduce the batteries needed is the exact same concept - sacrificing speed to improve fuel costs.
Shanghai to LA is probably the worst example (since the pacific ocean is basically the emptiest spot on the planet, as land/port frequency goes), but Hawaii still exists and they could recharge there.
stavros 4 hours ago [-]
How does Hawaii produce its power? I can't imagine they have tons of capacity.
EDIT: Seems like they mostly use imported oil, so saying "bring us a bunch of oil and we'll charge your batteries with it" seems like the ship is just burning oil with extra steps.
guttural 3 hours ago [-]
I bet these batteries would be standard container sized and they could be shipped as normal containers would be wherever cheap power is available from nuclear or solar or maybe water. Australia could be huge here, back in 2024 there were news of a six gigawatt solar farm in remote Northern Australia. Based on my very vague knowledge of the geography I presume there's plenty more desert to build solar there. Charge the battery-containers, ship them to China.
stavros 3 hours ago [-]
Whatever they are, you can't say "how does the ship refuel when it's empty? I know, it'll carry its own extra fuel".
algorias 4 hours ago [-]
The biggest problem with Electric is the battery weight, so it makes sense.
Ships deliberately use cheaper, less energy dense petroleum products (heavy fuel oil), for pretty much the inverse reasons why airplanes use kerosene.
colechristensen 2 days ago [-]
The recharging infrastructure for such a vessel would be an interesting challenge. Likewise if those batteries caught fire.
manquer 2 days ago [-]
No need do charge in-situ, the ships (and ports) already transfer several times the battery volume and weight on berthing quickly . The battery systems could be designed to leverage that .
Fire hazards are there for any fuel, Safety systems evolve to handle them. The environmental impact would be more localized than an oil spill.
mbirth 1 days ago [-]
Just make the battery banks container sized and swap them out with fresh ones while doing the main cargo. Then service and charge the old ones.
pbmonster 3 hours ago [-]
That also means you can trivially optimize your fuel/cargo ratios. Going across the pacific? Just load 200 more battery containers. Singapore to China right after? Room for 400 FEUs more than normal.
amluto 3 hours ago [-]
It’s not quite “just”. A way to safely and efficiently connect and disconnect them would be needed.
rgmerk 2 days ago [-]
A quick googling suggests that unloading such a vessel takes at least a couple of days, more likely 3-4.
Assuming two days available to charge the vessel, you'd need about 100MW continuous. Not trivial, but doable.
As far as battery fires go, sure, but a) there are already a lot of electric ferries in service so designing safe maritime battery packs isn't a new challenge and b) the alternative isn't exactly risk free either; we've seen plenty of oil spills from ships.
lostlogin 2 days ago [-]
The fire thing comes up with cars all the time. Petrol cars are vastly more likely to catch fire, but are a bit easier to extinguish.
I can only imaging how hard it is to put out a ship fire, but is there any reason to see that the situation would be different? Bunker fuel appears to be less flammable.
cellular 7 hours ago [-]
Just hang the batteries over the water in containers. Dip them into water if they catch fire.
darth_avocado 7 hours ago [-]
Electric battery fire is not exactly extinguished with water.
Maakuth 2 hours ago [-]
This is largely a misconception that's caused by the fact that EV fires are hard to extinguish with normal water sprays. That is because the bettery packs are designed to be water proof, so it is hard to get the fire patrol's water in. If you can immerse the pack in water, the fire is extinguished without much trouble. That's unlike petroleum fires, where the fuel is lighter than water and liquid, so water spray will boil and spread the fire instead of extinguishing it.
Qwertious 6 hours ago [-]
It doesn't need to be extinguished, it just needs to be removed from the ship. Even a second of airtime (and a healthy lateral velocity) might be enough that the ship is out of the explosive radius of the battery.
wakawaka28 8 hours ago [-]
>Petrol cars are vastly more likely to catch fire, but are a bit easier to extinguish.
Petrol cars at most marginally more likely to catch fire, if at all. They cannot catch fire by simply being submerged in a foot of water, like an EV can. They are far easier to extinguish than EVs, which are practically unextinguishable and can reignite weeks or months later. You can use a fire extinguisher on a petrol car fire if you catch it early (they are usually electrical fires). If you catch an EV fire early, your best course of action is to run away as fast as possible.
Ships are not known to be subject to fires because the types of fuel they use are not generally so volatile, and they are literally surrounded by water which can be pumped to the deck or wherever to drown any fire. Some use diesel, which is difficult to light even with a match. Others use heavy crude oil that looks like tar and would be similarly difficult to ignite accidentally. A battery fire on a ship would be a HUGE problem, as we have seen with ships carrying EVs.
I think another often-overlooked risk of EVs is the arson risk. Even if batteries are less likely to catch fire (in the first few years of use, if you baby them), a bad actor can start an unextinguishable fire by shorting out or otherwise igniting a battery pack. This is easy to do and devastating.
halJordan 14 hours ago [-]
How many ships in port charging at a time? Honestly sounds like a good place to stay a few of those micro reactors lockmart claims to have
rgmerk 12 hours ago [-]
The Port of Los Angeles is one of the largest ports in the USA, and has about 1,800 ship arrivals annually.
If they were all electric, all of this size, and required a full charge on arrival, you’re talking about (very roughly) 1 GW continuous power requirement for charging the ships. That’s a lot; no bones about it, but it’s not unprecedented - aluminium smelters and data centers are similarly hungry for power.
baq 5 hours ago [-]
If you have one ship to charge, maybe. Ten is in the standard nuclear power plant territory which is politically impossible to build outside of China.
anticodon 6 hours ago [-]
Wouldn't it be much easier than to put micro reactors on a ship directly? Like on Russian icebreakers that can function on one load of fuel for 3 or 5 years, don't remember exactly but at least 3 years for sure.
rswail 6 hours ago [-]
Containers in general as well as palletization dramatically improved the economics and port efficiency around the world.
Using containerized energy that can be offloaded and charged and swapped at ports is much more efficient way to spread the cost and infrastructure and safety around the world.
There are many ports where you really don't want any form of radiation/nuclear materials available.
toomuchtodo 2 days ago [-]
Sodium batteries have substantially reduced thermal runaway risk compared to lithium. Worst case, the ship sinks during a fire and the batteries are flooded. Charging infra is likely similar to existing EV ferry charging infra. Ship pulls into the berth and starts soaking the battery storage up to 1C up until departure. Could probably use a heat exchange and raw water available for battery cooling to maximize charge current curve, actively cooling the battery storage during charging.
Na-ion cells have roughly half the volumetric and gravimetric energy density of NMC, so it's double the weight and double the space. Apart from still being at least as—if not more—expensive as LFP, they also have a sloping voltage curve, vs lithium with is relatively flat, which poses problems for voltage conversion, and these engines are going to be taking kilovolts of power. So I think those problems would need to be solved first.
amluto 3 hours ago [-]
Is the sloping voltage curve that much of a problem? ISTM it might simplify cell balancing and SOC determination.
aeonfox 1 hours ago [-]
I'd imagine it makes providing constant AC voltage to the engines pretty tough. It's even a problem for home energy storage because you need an inverter that can handle a very wide range of input voltages. Most inverters will cut off well before the Na-ion battery is full drained, vs a lithium which can go pretty much all the way to 0%.
jmward01 2 days ago [-]
I did some fast back of the napkin math on the idea of sahara solar + electrified shipping + sodium ion batteries. A lot depends on the, as yet, fully disclosed pricing of sodium ion batteries but the trend in pricing, and capacity, is clear and the price point may have already happened to make this viable. One thing is clear though, even if my napkin math was massively optimistic and it isn't economically feasible now it will be shortly and at that point energy production around the world is potentially disrupted. Ships can pull in and feed the grid directly or offload containers and onload empty ones to make the trip back for cheap, clean, renewable power. It is looking more and more viable to ship electrons like we do for oil and that is a major game-changer.
idontwantthis 2 days ago [-]
That's both amazing and hilarious just like filling a plane with hard drives is both insanely effective and just plain insane.
jmward01 1 days ago [-]
Just to put the market into perspective, the UK was looking to build an undersea cable to push power from Morocco but canceled it [1]. That cable would have provided somewhere around 8% of the power to the UK and the whole project was slated to cost 25bn pounds (~$33b USD). Imagine sahara solar shipping could provide that but also supply (cheaper) to Spain, Italy, etc. As the tech gets better and cheaper the Americas could become customers too. Suddenly Timbuktu becoming an energy hub for the world doesn't sound as crazy as, well, it sounds.
AWS Snowmobile exists , I wouldn’t call filling a truck (or a plane) with hard disks insane .
eichin 5 hours ago [-]
mmm, it was discontinued in 2024 - so maybe amazon decided it was insane (well, insufficiently economic?) after all?
manquer 3 hours ago [-]
Less demand these days, In 2015 when it launched there was lot more drive to move to the cloud, lift and shift was the industry mantra. By 2024 the kind of orgs with >100 PB have already moved to cloud or have no plans to do so.
The current solution is we can bring our own devices and reserve ports on a AWS Data Transfer Terminal. It costs $300-500/hour USD for a 100 GbE bandwidth so not really cheap.
While AWS is stopping doing devices for migration (not economical at low volumes these days). They however still support physical transfers so customers can pack their own planes so to speak with hard disks to the AWS terminal.
Neil44 2 hours ago [-]
Since there is a lot of space out there in the ocean I wonder if some kind of big floating energy station could be a thing, using middle of the ocean wind, tidal or solar. I guess you don't have to pay anyone for the space or worry about too many regulations etc.
GJim 2 hours ago [-]
> I wonder if some kind of big floating energy station could be a thing
> I guess you don't have to pay anyone for the space or worry about too many regulations etc.
I'm ammused you think offshore energy is lawless. It's the same assumption that had the entire maritime community laughing at the clowns behind 'Seasteding" and the amusing MS Satoshi 'cryptoship'.
Neil44 7 minutes ago [-]
I found your reply unnecessarily snarky. The possibility I'l pondering would be to have a facility in deep ocean, far away from any countries coastline, but near shipping lanes.
simgt 3 hours ago [-]
Sails [0] [1] [2] are obviously more sustainable than the gigantic industry needed around batteries this size. That'd of course massively increase the cost of shipping and suddenly producing most things locally would make more economical sense. Bye bye £2 jeans from Shein.
Sorry this makes zero sense. The low price of shipping comes from the huge size of ships. All these 100% sailing ventures are just so someone can sell you gourmet coffee with a nice story at outrageous prices
simgt 2 hours ago [-]
You really should try to read up to at least the second sentence of a comment before hitting reply.
HPsquared 3 hours ago [-]
I wonder how much the jeans would cost if the price of shipping (i.e. the cost per container ocean mile) were to double.
tralarpa 2 hours ago [-]
I searched a little bit and found these numbers for t-shirts in a 20 foot container:
- Shipping container from China to the US: $3000-$9000 (tariffs?)
- Number of t-shirts per container: 35000
How much heavier are jeans than t-shirts? 10 times? That would mean an increase of $2.50 if container shipping costs double.
simgt 2 hours ago [-]
I think the volume is what defines the cost for cargo shipping so your 10x is likely pessimistic. $2.50 is both significant relative to the price of one these jeans and not much compared to what has been the expected cost of a pair for decades.
It says more about how dirt cheap shipping is the single enabler of globalization, even doubling the cost may not be enough to significantly shorten the supply chains.
api 12 minutes ago [-]
The US with its sunk cost and political power base in fossil fuels is losing the innovators dilemma at a large scale here.
56J8XhH7voFRwPR 2 days ago [-]
I guess I want to know "oceanic" means in this instance. Is that just going out into the ocean a short distance? They mention the "Yangtze River Three Gorges 1" river cruise ship as an example. This thing has a range of like 100km. It seems we are far away from making true oceanic crossings of any long distance and I doubt that is coming by 2028.
Animats 2 days ago [-]
East Asia has extensive coastal medium-distance trade. There are so many islands and island nations. That's oceanic trade, but not transatlantic or trans-pacific long hauls.
antonkochubey 2 days ago [-]
Those small islands also don’t have any infrastructure to recharge such ships. The small ones often struggle even to serve their own needs.
Animats 1 days ago [-]
Islands. As in Japan, Taiwan, Okinawa, Philippines, Malaysia, Indonesia, New Guinea, and for practical purposes, Australia. All of which rely on medium-haul sea traffic.
matthewdgreen 2 days ago [-]
I would expect that building out electric fueling points throughout Asia will be a big infrastructure investment over the next few years.
ta9000 2 days ago [-]
If it were Elon Musk saying it, I’d agree, but this is CATL. They actually do the work.
lostlogin 2 days ago [-]
Fully autonomous cargo shipping is coming with the next update.
manacit 4 hours ago [-]
Cargo ships have very few crew as-is, I'd imagine there isn't a huge need to lower that from where it is now.
If something breaks in the middle of the ocean, it's probably better to have a few people on board who can fix it.
tarokun33 4 hours ago [-]
For a vessel the size of a container ship, mounting an SMR (Small Modular Reactor) directly to power it would likely result in less energy loss.
cenamus 4 hours ago [-]
Not even the Russians could decommission their nuclear subs properly. I'm relatively sure that random semi-shading shipping companies wouldn't either.
In a perfect world however... endless cooling water unless they're in some shallow harbor. Would be the perfect application.
mschuster91 1 hours ago [-]
> In a perfect world however... endless cooling water unless they're in some shallow harbor. Would be the perfect application.
Still not, because all it takes is one thing going Seriously Fucking Wrong on another ship and boom, you got yourself a nuclear disaster. Just look at the Francis Scott Key Bridge and imagine that that ship hadn't hit a bridge support but a nuclear powered vessel.
Nuclear powered ships only make sense for ships operating in places where there is no other ship in sight for hundreds of miles (i.e. icebreakers) or for military ships that can and will shoot and sink anything with the potential of becoming a threat.
But an extremely expensive crew to run it coupled with extremely high CAPEX.
Even navies are moving away from nuclear power due to how expensive it is.
ggm 7 hours ago [-]
Ships sail at the cost of static resistance in water. Larger ships are more efficient, once buoyant. There is a New Scientist story about a guy on guard duty moving a moored navy boat by leaning on it, for a long period of time.
TL;DR marine is the one niche where "we had to make it a lot bigger to hold the batteries" isn't actually a big deal. If you do this the right way, you still have heaps of volume for cargo, and solar cells on the hold covers.
mahrain 5 hours ago [-]
It would be amazing if they could leverage the container system, but instead of goods, there'd be battery containers they could just plug in to the ship. You could even charge a battery container somewhere and bring it in by (electrified) rail.
pbmonster 3 hours ago [-]
If we ever end up doing that it would mean terrible things for the state of our regulatory landscape.
A completely optimized high capacity cargo rail line can move 500 rail cars per hour. That's 1000 FEUs if we double stack containers. A lithium battery system in a FEU has around 2 MWh of storage. So that rail line has 2 GW transmission capacity if we saturate it with batteries - the same as a single high voltage transmission line. Being unable to build one of those in parallel to the rail line would be extremely sad.
Note that 500 rail cars per hour is actually an impressive feat of logistics. A normal rail yard at a port would be very happy with a sustained rate of 200 rail cars per hour, and will frequently drop below that.
j16sdiz 5 hours ago [-]
This is overly optimistic.
If you expect _oceanic_ ships in 3 year, you need to start building infrastructure today, in multiple ports.
If you need to build those infrastructure today, you need to have something standardize.
otoh, if all you want are just some prototypes, we have them today already..
Havoc 4 hours ago [-]
I guess if it works for cars then boats should too
eimrine 2 days ago [-]
Is it possible for ocean vessel to generate from sun panels as much as needed for moving? I would suggest vessels does not need scarce Lithium, it is too needed for some other uses.
themanmaran 2 days ago [-]
Unfortunately, it's not even close. Maybe 1-2% in a highly optimistic scenario.
- 20k square meters of hull space
- If fully covered with solar panels, on a sunny day, you could expect 1-2 MWh (when averaging in night time)
- Current diesel engines typically output 60MWh continuously while underway.
And that's not factoring in the solar panels getting covered in salt over time and losing efficiency. Plus preventing the ship from actually loading / unloading cargo efficiently.
It's not just a matter of panel efficiency either. If we had magic panels that could absorb 100% of the suns power over the 20k sqm deck, it would only equate to about four times as much (8% of the overall power need).
tshaddox 2 days ago [-]
Did you mean MW rather than MWh?
themanmaran 1 days ago [-]
Yea mixed up my units in a couple places. Should be:
- Solar: 1–2 MW of average power; ~24–48 MWh of energy per day.
- Diesel: about 60 MW of mechanical power while underway; ~1,440 MWh of energy per day.
probablypower 2 days ago [-]
60 MWh continuously means inf MW.
SigmundA 2 days ago [-]
60 MWh continuous is nonsense because its a unit of energy, 60 MWh per hour is just 60 megawatts, 60 MWh per second however is 216 gigawatts.
SigmundA 2 days ago [-]
Your math seem to work out, but I don't like the incoherent use if energy units.
60 MWh per what? Per hour? thats just 60 MW continuous POWER or 1440 MWh ENERGY per day.
epistasis 2 days ago [-]
Lithium is not scarce, and not a limiting factor for scaling up batteries.
There's more than enough lithium out there, more discovered every month, and the perception that we are limited by lithium is mostly out there because certain media sources are trying to help out there fossil fuel friends by delaying the energy interchange by a few years.
Whether battery ocean shipping containers make technical sense is a different question, but I wouldn't worry about lithium use!
dalyons 2 days ago [-]
By the time we get around to building these it would likely be sodium ion anyway
tim333 1 days ago [-]
Maybe not scarce in an absolute sense but what about whether there is a spare million tons lying around to make ship batteries?
epistasis 1 days ago [-]
What's more scarce is the factory capacity to build the batteries, and the scale of their supply chains. But even that is expanding by 10x every five years. We are currently building more than a TWh per year of batteries.
If there is demand for batteries in ships, it is going to be far smaller than for cars, which is currently 80% of battery demand (the rest is mostly grid storage). So ship batteries will at most slow the fall of battery pricing by a small amount.
jiggawatts 2 days ago [-]
All resources are "scarce" at very low price points, below which most nations are unable or unwilling to extract them.
Lithium, rare earth metals, and a bunch of others are only "scarce" because right now China is the only country willing to put up with the pollution levels that the cheap, dirty version of their extraction produces.
Everything can be produced cleanly, safely, etc... but that comes at a price.
It's like when employers complain that "nobody wants to work". That needs to be translated to "nobody wants to work for the low wages I'm willing to pay".
fulafel 2 days ago [-]
Yes, but it would move very slowly compared to current freight ships, think an order of magnitude lower average speed. (You can compromise on the freight features to get some more speed of course, but it's still going to be slower unless you do something dramatic like fly a huge PV array as a kite or something)
Besides PV, there's a long history of wind powered ships of course.
rgmerk 2 days ago [-]
No.
I’m too lazy to do it myself but 5 minutes of searching and calculating will show you that the area of solar panels required to move a ship is far, far, larger than the area of that ship.
Not to mention that a container ship’s deck is typically completely covered with, well, containers.
Also, lithium isn’t scarce.
g-b-r 6 hours ago [-]
> Not to mention that a container ship’s deck is typically completely covered with, well, containers.
I guess in theory that could be solved either with huge removable panels around the containers (to be "put aside" somewhere during the loading operations), or placing containers with solar panels (and ways to deliver the energy to the ship) on the outer sides of the cargo.
Actually, maybe the batteries themselves could be loaded as containers on the sides of the cargo, with solar panels on them; that might increase the risk for the cargo if some catch fire, though
But, I guess it wouldn't be worthwhile.
givemeethekeys 2 days ago [-]
There are examples of solar electric catamarans - but they are much smaller than a cargo vessel. It's not nothing, but we're some ways away.
I wouldn't underestimate what creative and dedicated engineers can accomplish.
Onavo 2 days ago [-]
No, but with wind it's possible. Either vertical windmills or sails with modern signal processing.
Honestly DJI and Boeing should get into this business. A boat's sail basically a plane's wing, aerodynamically speaking. They share a lot of similarities with endurance gliders.
bluGill 2 days ago [-]
Plenty of engineers exist in sailing who know all that and have studied this. Boeing brings nothing new if they get in. Well other than perhaps dollars, but that isn't the problem for the most part.
throw-qqqqq 2 days ago [-]
Smaller boats sure, but ocean going cargo vessels? There are some serious challenges!
Try to approximate the area needed to generate e.g. 50MW propulsion. It would be measured in hectares.
ta9000 2 days ago [-]
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mcculley 2 days ago [-]
I am very skeptical. Battery tech is still far away from the energy density of diesel fuel. How far could an electric ship go and what could it carry?
jacquesm 2 days ago [-]
There are multiple electric ferries already in operation:
They are quite impressive but they are still very far away from your average ocean going cargo vessel.
toast0 2 days ago [-]
Electrifying ferries is great, but this particular one has a run time of 20 minutes (and a charge time of 10 minutes). I get a totally different vibe from 'oceanic ship' than a 20 minute ferry ride.
Near me, we now have a hybrid ferry, no charging infrastructure, but it still uses much less fuel than before it was refit, so that's cool too. It's bigger than the one you linked and sails on a longer route: 2,499 passengers, 202 vehicles, typically serves an 8.6 mile route.
Absolutely, but that's how this starts. Boats too started as ferries, it took many, many years before boats purposefully went into blue water. Ferries are a great testbed, they have lots of cycles and they are a pre-cursor to coastal and then eventually larger ocean going vessels, which I predict will go diesel-electric before they go all electric.
jabl 5 hours ago [-]
> eventually larger ocean going vessels, which I predict will go diesel-electric before they go all electric.
Diesel-electric, particularly when using Azipods, is great when you need to do a lot of maneuvering in narrow spaces like ports. But for long-haul it's hard to beat the economics of a two-stroke direct drive diesel.
Maybe a hybrid concept for a long-haul ship would be using a direct drive two-stroke main engine, but the auxiliary diesels replaced by batteries?
SideburnsOfDoom 15 hours ago [-]
> Electrifying ferries is great, but this particular one has a run time of 20 minutes (and a charge time of 10 minutes).
And this one, under construction now, will have a run time of 90 minutes and charge time of 40 minutes:
Sibling comment is perfectly correct that it starts small and ramps up.
From that article:
> "The ferry format, with its high-frequency turnaround, relatively short segment distances, and shore-based rapid charging, is one of the most promising early use cases for electrification in the maritime sector. Maritime electrification has gained momentum over the past few years"
Early. Momentum.
Moving some noticeable percentage of ships away from fossil fuels is still a win.
jacquesm 14 hours ago [-]
I think we'll see a return to sailing at some point with diesel-electric hybrids in between (there are just too many advantages to that model). The sooner we kick the fossil fuels habit the better.
mcculley 2 days ago [-]
Yeah, the oceanic part is the issue. Going between two close points, at least one of which has electricity, is easy.
HWR_14 8 hours ago [-]
Energy density doesn't seem to matter much in boats. Massive ships carry astronomical amounts of cargo.
Right, but batteries are still improving quickly. They won't stay where they currently are.
scythe 2 days ago [-]
Depends on the current fuel-to-payload ratio of the diesel ships. If it's 3% and batteries would push it to 10%, it's not a huge problem. But if it's 15% and batteries would push it to 50% you're losing a lot of capacity.
timbit42 22 hours ago [-]
The top upvoted comment on this post suggests it's less than double.
rgmerk 15 hours ago [-]
Not quite. The difference in energy density is way more than that.
However, most large ships apparently have multiple times more fuel capacity than is required for 5,000km of range, which is what makes the electric version realistic.
jauco 2 days ago [-]
We already have electric oceanic ships. They’re called nuclear submarines.
Allseas is putting the reactors on their vessels as well iirc.
Russia is operating nuclear civil vessels (icebreakers) since 1957
matthewdgreen 2 days ago [-]
US nuclear submarines consume highly-enriched uranium, that's nearly as (and sometimes more) pure as the weapons-grade version. That doesn't mean oceanic reactors aren't possible, it just means that military subs are a bad example.
jabl 5 hours ago [-]
French nuclear submarines run on 7% enriched fuel, so it's certainly possible to build military submarines that don't need HEU.
manquer 2 days ago [-]
There are nuclear icebreakers.
Nuclear powered non military ships do exist, it just not economically feasible .
leosarev 6 hours ago [-]
Much more economically feasible than battery powered ones.
ok_dad 4 hours ago [-]
Prove it.
foota 2 days ago [-]
While perhaps not practical for oceanic shipping as is, it's a fun exercise to demonstrate the energy density of nuclear power.
thelastgallon 1 days ago [-]
I wonder if nuclear containerships can be developed and have enough power to pull a train of containerships.
certainly there exist nuclear ships with enough power but I fail to see how you would feasibly tug a train of containerships
zeristor 2 days ago [-]
Cars have regenerative breaking which is a help in urban areas.
Ships tend to go not change course nearly as much on a several day journey. I guess a propellor could run in reverse for regenerative breaking, but it wouldn’t help much.
jacquesm 2 days ago [-]
Ships are subject to so much drag that this is rarely a problem, only in emergency situations and there is not much that you can do to stop a vessel that weighs 100,000 tons or more except to run your engines in reverse and start praying to your deity. Regenerative braking for boats would be a complete waste.
There are some vessels that have single use emergency brakes, but the latest trend is to have motor 'pods' that are electrical and that can be used both for normal propulsion as well as to perform emergency stops that are quite impressive given the size of the vessels they are on. Typically an oceangoing vessel requires at least 3, but commonly 5 to 10 ship lengths to come to a full stop from moving forward under power. This is not necessarily because of limitations of the propulsion unit, but simply because stopping that much tonnage too fast would do as much damage as a collision would. With classical engines there is far more rotating mass so it would take much longer than with electrical propulsion to react before the beginning of the braking phase.
VBprogrammer 2 days ago [-]
Pods are used primarily for manoverability. This allows Cruise ships to get in and out of ports with a minimum of assistance (none at all, if conditions permit). This is important because they are entering and leaving ports every day or two. It also makes sense as the hotel loads on these floating skyscrapers is similar to the propulsion loads so having combined main engines and generators gives other advantages.
Ocean going container vessels on the other hand use massive direct drive two stroke diesel engines (usually they only have a single engine). They have no gearbox. The only way to go-astern is to literally start the engine in reverse. This can only be done up to a limited speed, otherwise the windmilling effect of the water passing through the prop would overpower the starting air.
Suffice to say, I'd put a long bet on the overwhelming majority of containerships being powered by internal combustion engines in 30 years time. If we get our act together we might have come up with an alternative / synthetic fuel by then but I wouldn't hold my breath.
It's interesting but it's just an automated system build on top of the existing pod drive architecture which is there for the reasons I suggested.
Interestingly, there are situations in which it might be helpful where it wouldn't have worked. For example, the Francis Scott Key Bridge incident. The vessel suffering from a blackout caused by a transformer being tripped by a single loose wire.
jacquesm 22 hours ago [-]
Yes, new technology enables other new technology. The e-brake potential of drive pods was recognized before they were put to practice, and the jury is still out on whether or not it is the way of the future. But it is something that simply wasn't possible before at all unless you wanted to risk a snapped drive shaft, you can't just throw that much rotating mass into reverse without consequences and the driveshafts of a liner are most impressive, I've stood on a lathe that could cut them, and that thing required it's own building and power hookup just to spin the shaft up in a reasonable amount of time for machining.
> The vessel suffering from a blackout caused by a transformer being tripped by a single loose wire.
Transformers don't 'trip'. Circuit breakers do.
Yes, it was a loose wire. But that vessel had regular diesel propulsion so that is not going to make any difference, loose wires can - and do - happen, usually with less far reaching consequences.
The point of the pods is that there are many of them, and they are somewhat redundant reducing the chance of such complete outages. It may well have prevented that particular accident but it may have caused another. This tech is just too new to draw any conclusions.
As far as I understand it every pod has its own dedicated power infrastructure section (batteries, drivers), with the ability to maintain symmetrical drive even in light of multiple failures. So these are right now not for normal propulsion on ocean going vessels (though in a diesel-electric setting they could already be used like that and there are a couple of vessels that use them but I'm not sure if that is for main propulsion as well), but these 'captive torpedos' definitely have a lot of potential.
VBprogrammer 4 hours ago [-]
> Transformers don't 'trip'. Circuit breakers do.
I'm not sure what this pedantry adds. It's pretty common to say that a piece of equipment tripped for example whole power stations, a generator, a pump etc. When of course it's the circuit breaker protecting that equipment or even occasionally something like a physical over speed trip.
The pod drive architecture, and diesel electric more generally, only makes sense when the other benefits outweigh the efficiency losses of converting from mechanical to electrical and back again. It's very difficult to beat a shaft connected directly from the flywheel to the propeller.
NewJazz 2 days ago [-]
Regenerative braking for boats would be a complete waste.
Unless you have a large sail to generate thrust to spin the propeller...
lostlogin 2 days ago [-]
It’s a pity that the sail isn’t also PV solar.
tmountain 2 days ago [-]
Isn’t regenerative braking reclaiming otherwise wasted energy from necessary deceleration? Running the propeller in reverse would result in having to apply equal or greater energy to regain the current speed, so it’s a net loss of energy if I’m understanding the suggestion properly.
tshaddox 2 days ago [-]
Not changing course is good though. Regenerative braking is only good because it increases the efficiency when you absolutely must slow down, but it would always be more efficient to slow down less.
dyauspitr 2 days ago [-]
Wind, large surface area for solar
Also wave based generators that could also act as dampers/suspension and they wouldn’t steal energy from forward motion like wind would (depending on if you’re generating wind energy or using wind to buttress the batteries).
Ideally a combination of sails coupled with batteries and wave generators sounds like it would be very energy efficient.
jacquesm 2 days ago [-]
Solar on board of cargo vessels is a pipe dream, as is 'wave based generation'.
Rendered at 12:07:19 GMT+0000 (Coordinated Universal Time) with Vercel.
- Weight is less of a limitation than you would think. Ship size is measured in tonnage. 40K-60K is a medium sized cargo carrying ship. So lets assume a ship like that.
- Battery weight calculations are going to be key. If you assume 170 wh/kg, 6 tonnes of battery equals about 1 mwh of battery.
- Energy usage of ships is speed dependent and it's a non linear relationship. You can save a lot of energy by going a bit slower. Going about 15 knots, a ship like this might use 15mw of power.
So the math becomes something like 6 x 15 = 90 tons of battery per hour. 5000km is about 2700 nautical miles (1 knot == 1 nautical mile/hour). So, you need about 180 hours of battery. Or about 16200 tons for a total of 15mwh x 180 = 2.7gwh of energy. That's a big battery.
The real limitation here comes from the cost of the batteries, which is dropping fast with sodium ion. The reason CATL is bringing this up is because they've been doing similar math with some informed $/kwh math. If they can get it down to around 20$/kwh, a mwh would cost 20K, and a gwh would cost 20M. So the battery would cost 54M$.
The key here is that this is still assuming 15knots. Energy usage might drop considerably if you drop it to 10 knots or even lower. You might only need 7200 tons of battery at those speeds.
The ship can handle the weight either way, though you are sacrificing useful load of course. The real constraints here are cost and speed. You pay a fat premium for a fast ship. Of course ships this size aren't cheap. A few tens of millions is normal. And they burn through many millions worth of fuel per year too. So, even though that amount of battery is expensive, the math might actually work out to these ships being cheap enough to operate that they'd earn back their battery.
You'd have to be pretty bullish about cost and performance of batteries. But CATL clearly feels that way. They have several battery chemistries at their disposal with higher densities (and cost). Over time, batteries might get cheaper and more dense. Ship designs might be optimized for batteries (e.g. structural hulls with battery). There's a lot of wiggle room here. But it's not an impossible proposition.
I wonder if there's significant scope for offsetting electricity consumption by adding deck renewables. Not for container ships, but maybe for tankers .. which are only needed because of fossil fuel consumption elsewhere. Hmm.
Otherwise, it's not a bad idea as you could pump the pre-charged fluids in/out and even ship the fluid around with tankers; which opens up the possibility of fueling at sea. Spills would be bad. But probably better than oil as the toxic fluids dilute more easily. But it would still be a bad day for marine life. It might work for shorter ranges.
You'd probably want to use a mix of local wind/solar power and a grid connection. Of course, harbors usually already have lots of infrastructure to power heavy industry (steel, refineries, etc.) and transport (e.g. rail). This just adds to that.
There are also other solutions including using container batteries and simply swapping in fresh ones. Which especially in a container harbor shouldn't be that big of a deal.
(Similarly, refueling a ship is substantially more complicated than refueling an automobile.)
Maritime engineers and workers can get this job done.
Obviously there are better solutions, but that solution demonstrates feasibility with no further engineering work required.
* a 5,000 km electric range. * 40MW continuous power requirement for a 21.5 knot cruise speed[1] for a 14000 teu container vessel: * the size and weight capacity for the batteries being the same as the fuel capacity for a 14000 teu container vessel (taking the upper figure from [2]) * the battery pack having similar gravimetric (weight) and volumetric(size) energy density as this a modern Chinese NMC EV pack[3]
The short version is that the battery vessel would require about 25,000 tonnes of batteries for a 5,000km range under those assumptions, which compares to the current fuel capacity of approximately 13,000 tonnes. Volumetrically, it's even closer - about 17,000 cubic metres, compared to about 13,000 for the bunker fuel.
Furthermore, it's worth considering just how much cargo the ship carries. One teu corresponds to about 33 cubic metres of cargo space (not counting the space taken up by the walls of the container), so the ship can carry about 462,000 cubic metres of cargo. So the additional space required to carry an additional 3,500-odd cubic metres of batteries corresponds to only about 0.8% of the ship's total cargo-carrying capacity.
I was surprised at just how doable this is, to be honest. What threw me is just how much bunker fuel ships can carry; if I'm doing the sums right, a ship like this can carry enough fuel to circumnavigate the globe a couple of times over. It may well make economic sense but it's not really necessary to have that kind of range to operate the ship safely.
[1]https://www.man-es.com/docs/default-source/marine/tools/prop... [2]https://www.freightwaves.com/news/how-many-gallons-of-fuel-d... [3]https://www.batterydesign.net/zeekr-140kwh-catl-qilin/
The battery capacity you have calculated needs about 500 shipping containers.
A large shipping vessel carries 24000 container. So make the batteries containerized, and easy to load/unload.
You could imagine pretty fast charging like this, and at some point in the near future using the same infrastructure with containerized nuclear reactors.
Even if you built one, as some people have proposed designs, it doesn't get you nuclear reactors you can just stack up on a ship or something. Containerized reactors could be convenient for getting a reactor to a remote site where it's needed but once there you'll have to provide substantial shielding for it; usually the way this is meant to be done in these proposals is digging a big hole and/or putting up earthen berms around it. And those earthen berms will be subjected to a lot of neutron radiation, so you need a plan to deal with the site after you run this reactor for any substantial amount of time; the whole site will be radioactive.
There's really no getting around this, and most of the people pitching container-sized nuclear reactors are hoping investors don't realize it. The amount of shielding that you could ever hope to place in an ISO container isn't anywhere near enough.
https://world-nuclear.org/information-library/nuclear-power-...
1. I'm ball-parking an onboard nuclear source would take up the equivalent displacement as 20-50 containers.
You can imagine this needs solving pretty hardcore optimization problems.
How many kwh are you lifting at a time with a container? How many kwh are you pumping in the same period?
These kind of infrastructure is not something you can build in 3 year. You need more than one port having that.
How?
A grid can do it too, but spiky 400MW loads are difficult and annoying for a utility. And the port, who would probably have to call in to schedule charging.
It's much easier to "trickle" charge a grid scale battery bank, which can then be used however the port wants whenever they want without upsetting the grid.
Ports can have 10+ container ships at once and unloading one can take multiple days. You're not surprising the power company with sudden loads, you're building a big power plant at the docks and then selling power to the grid during the part of the day when the price is high and charging the ships when it's low.
I wonder what the "trickle" power requirement is? Knowing next to nothing about shipyard logistics... 20MW?
It likely will depend on patterns of harbour. Like how many ships visit, what sort of distance those go. And how much of total time is spend charging some ship.
Worst case is maximum distance trips and maximum utilization that is there being ship almost always being docked. Apart from times when docked ship change.
Is bunker fuel energy density just that bad or is it something else? A 50kg tank of diesel can easily outperform a 200kg pack of batteries in an ev.
Shanghai to Los Angeles is more than double that
Shanghai to LA is probably the worst example (since the pacific ocean is basically the emptiest spot on the planet, as land/port frequency goes), but Hawaii still exists and they could recharge there.
EDIT: Seems like they mostly use imported oil, so saying "bring us a bunch of oil and we'll charge your batteries with it" seems like the ship is just burning oil with extra steps.
Ships deliberately use cheaper, less energy dense petroleum products (heavy fuel oil), for pretty much the inverse reasons why airplanes use kerosene.
Fire hazards are there for any fuel, Safety systems evolve to handle them. The environmental impact would be more localized than an oil spill.
Assuming two days available to charge the vessel, you'd need about 100MW continuous. Not trivial, but doable.
As far as battery fires go, sure, but a) there are already a lot of electric ferries in service so designing safe maritime battery packs isn't a new challenge and b) the alternative isn't exactly risk free either; we've seen plenty of oil spills from ships.
I can only imaging how hard it is to put out a ship fire, but is there any reason to see that the situation would be different? Bunker fuel appears to be less flammable.
Petrol cars at most marginally more likely to catch fire, if at all. They cannot catch fire by simply being submerged in a foot of water, like an EV can. They are far easier to extinguish than EVs, which are practically unextinguishable and can reignite weeks or months later. You can use a fire extinguisher on a petrol car fire if you catch it early (they are usually electrical fires). If you catch an EV fire early, your best course of action is to run away as fast as possible.
Ships are not known to be subject to fires because the types of fuel they use are not generally so volatile, and they are literally surrounded by water which can be pumped to the deck or wherever to drown any fire. Some use diesel, which is difficult to light even with a match. Others use heavy crude oil that looks like tar and would be similarly difficult to ignite accidentally. A battery fire on a ship would be a HUGE problem, as we have seen with ships carrying EVs.
I think another often-overlooked risk of EVs is the arson risk. Even if batteries are less likely to catch fire (in the first few years of use, if you baby them), a bad actor can start an unextinguishable fire by shorting out or otherwise igniting a battery pack. This is easy to do and devastating.
If they were all electric, all of this size, and required a full charge on arrival, you’re talking about (very roughly) 1 GW continuous power requirement for charging the ships. That’s a lot; no bones about it, but it’s not unprecedented - aluminium smelters and data centers are similarly hungry for power.
Using containerized energy that can be offloaded and charged and swapped at ports is much more efficient way to spread the cost and infrastructure and safety around the world.
There are many ports where you really don't want any form of radiation/nuclear materials available.
https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2023-04/...
https://old.reddit.com/r/electricvehicles/comments/1m8wlou/e...
[1] https://apnews.com/article/uk-morocco-renewable-energy-xlink...
The current solution is we can bring our own devices and reserve ports on a AWS Data Transfer Terminal. It costs $300-500/hour USD for a 100 GbE bandwidth so not really cheap.
While AWS is stopping doing devices for migration (not economical at low volumes these days). They however still support physical transfers so customers can pack their own planes so to speak with hard disks to the AWS terminal.
Congratulations, you have just re-invented offshore (floating) wind turbines. https://duckduckgo.com/?t=ftsa&q=floating+wind+turbines+&ia=...
> I guess you don't have to pay anyone for the space or worry about too many regulations etc.
I'm ammused you think offshore energy is lawless. It's the same assumption that had the entire maritime community laughing at the clowns behind 'Seasteding" and the amusing MS Satoshi 'cryptoship'.
[0] https://www.towt.eu/en/home/
[1] https://www.neoline.eu/
[2] https://graindesail.com/fr/voilier-cargo-grain-de-sail-3/
- Shipping container from China to the US: $3000-$9000 (tariffs?)
- Number of t-shirts per container: 35000
How much heavier are jeans than t-shirts? 10 times? That would mean an increase of $2.50 if container shipping costs double.
It says more about how dirt cheap shipping is the single enabler of globalization, even doubling the cost may not be enough to significantly shorten the supply chains.
If something breaks in the middle of the ocean, it's probably better to have a few people on board who can fix it.
In a perfect world however... endless cooling water unless they're in some shallow harbor. Would be the perfect application.
Still not, because all it takes is one thing going Seriously Fucking Wrong on another ship and boom, you got yourself a nuclear disaster. Just look at the Francis Scott Key Bridge and imagine that that ship hadn't hit a bridge support but a nuclear powered vessel.
Nuclear powered ships only make sense for ships operating in places where there is no other ship in sight for hundreds of miles (i.e. icebreakers) or for military ships that can and will shoot and sink anything with the potential of becoming a threat.
https://en.wikipedia.org/wiki/Russian_floating_nuclear_power...
Even navies are moving away from nuclear power due to how expensive it is.
TL;DR marine is the one niche where "we had to make it a lot bigger to hold the batteries" isn't actually a big deal. If you do this the right way, you still have heaps of volume for cargo, and solar cells on the hold covers.
A completely optimized high capacity cargo rail line can move 500 rail cars per hour. That's 1000 FEUs if we double stack containers. A lithium battery system in a FEU has around 2 MWh of storage. So that rail line has 2 GW transmission capacity if we saturate it with batteries - the same as a single high voltage transmission line. Being unable to build one of those in parallel to the rail line would be extremely sad.
Note that 500 rail cars per hour is actually an impressive feat of logistics. A normal rail yard at a port would be very happy with a sustained rate of 200 rail cars per hour, and will frequently drop below that.
If you expect _oceanic_ ships in 3 year, you need to start building infrastructure today, in multiple ports.
If you need to build those infrastructure today, you need to have something standardize.
otoh, if all you want are just some prototypes, we have them today already..
- 20k square meters of hull space
- If fully covered with solar panels, on a sunny day, you could expect 1-2 MWh (when averaging in night time)
- Current diesel engines typically output 60MWh continuously while underway.
And that's not factoring in the solar panels getting covered in salt over time and losing efficiency. Plus preventing the ship from actually loading / unloading cargo efficiently.
It's not just a matter of panel efficiency either. If we had magic panels that could absorb 100% of the suns power over the 20k sqm deck, it would only equate to about four times as much (8% of the overall power need).
- Solar: 1–2 MW of average power; ~24–48 MWh of energy per day.
- Diesel: about 60 MW of mechanical power while underway; ~1,440 MWh of energy per day.
60 MWh per what? Per hour? thats just 60 MW continuous POWER or 1440 MWh ENERGY per day.
There's more than enough lithium out there, more discovered every month, and the perception that we are limited by lithium is mostly out there because certain media sources are trying to help out there fossil fuel friends by delaying the energy interchange by a few years.
Whether battery ocean shipping containers make technical sense is a different question, but I wouldn't worry about lithium use!
If there is demand for batteries in ships, it is going to be far smaller than for cars, which is currently 80% of battery demand (the rest is mostly grid storage). So ship batteries will at most slow the fall of battery pricing by a small amount.
Lithium, rare earth metals, and a bunch of others are only "scarce" because right now China is the only country willing to put up with the pollution levels that the cheap, dirty version of their extraction produces.
Everything can be produced cleanly, safely, etc... but that comes at a price.
It's like when employers complain that "nobody wants to work". That needs to be translated to "nobody wants to work for the low wages I'm willing to pay".
Besides PV, there's a long history of wind powered ships of course.
I’m too lazy to do it myself but 5 minutes of searching and calculating will show you that the area of solar panels required to move a ship is far, far, larger than the area of that ship.
Not to mention that a container ship’s deck is typically completely covered with, well, containers.
Also, lithium isn’t scarce.
I guess in theory that could be solved either with huge removable panels around the containers (to be "put aside" somewhere during the loading operations), or placing containers with solar panels (and ways to deliver the energy to the ship) on the outer sides of the cargo.
Actually, maybe the batteries themselves could be loaded as containers on the sides of the cargo, with solar panels on them; that might increase the risk for the cargo if some catch fire, though
But, I guess it wouldn't be worthwhile.
I wouldn't underestimate what creative and dedicated engineers can accomplish.
Honestly DJI and Boeing should get into this business. A boat's sail basically a plane's wing, aerodynamically speaking. They share a lot of similarities with endurance gliders.
Try to approximate the area needed to generate e.g. 50MW propulsion. It would be measured in hectares.
https://en.wikipedia.org/wiki/MV_Ampere
They are quite impressive but they are still very far away from your average ocean going cargo vessel.
Near me, we now have a hybrid ferry, no charging infrastructure, but it still uses much less fuel than before it was refit, so that's cool too. It's bigger than the one you linked and sails on a longer route: 2,499 passengers, 202 vehicles, typically serves an 8.6 mile route.
https://en.wikipedia.org/wiki/MV_Wenatchee
Diesel-electric, particularly when using Azipods, is great when you need to do a lot of maneuvering in narrow spaces like ports. But for long-haul it's hard to beat the economics of a two-stroke direct drive diesel.
Maybe a hybrid concept for a long-haul ship would be using a direct drive two-stroke main engine, but the auxiliary diesels replaced by batteries?
And this one, under construction now, will have a run time of 90 minutes and charge time of 40 minutes:
https://spectrum.ieee.org/electric-boat-battery-ship-ferry https://news.ycombinator.com/item?id=45844832
Sibling comment is perfectly correct that it starts small and ramps up.
From that article:
> "The ferry format, with its high-frequency turnaround, relatively short segment distances, and shore-based rapid charging, is one of the most promising early use cases for electrification in the maritime sector. Maritime electrification has gained momentum over the past few years"
Early. Momentum.
Moving some noticeable percentage of ships away from fossil fuels is still a win.
However, most large ships apparently have multiple times more fuel capacity than is required for 5,000km of range, which is what makes the electric version realistic.
Allseas is putting the reactors on their vessels as well iirc.
Nuclear powered non military ships do exist, it just not economically feasible .
Ships tend to go not change course nearly as much on a several day journey. I guess a propellor could run in reverse for regenerative breaking, but it wouldn’t help much.
There are some vessels that have single use emergency brakes, but the latest trend is to have motor 'pods' that are electrical and that can be used both for normal propulsion as well as to perform emergency stops that are quite impressive given the size of the vessels they are on. Typically an oceangoing vessel requires at least 3, but commonly 5 to 10 ship lengths to come to a full stop from moving forward under power. This is not necessarily because of limitations of the propulsion unit, but simply because stopping that much tonnage too fast would do as much damage as a collision would. With classical engines there is far more rotating mass so it would take much longer than with electrical propulsion to react before the beginning of the braking phase.
Ocean going container vessels on the other hand use massive direct drive two stroke diesel engines (usually they only have a single engine). They have no gearbox. The only way to go-astern is to literally start the engine in reverse. This can only be done up to a limited speed, otherwise the windmilling effect of the water passing through the prop would overpower the starting air.
Suffice to say, I'd put a long bet on the overwhelming majority of containerships being powered by internal combustion engines in 30 years time. If we get our act together we might have come up with an alternative / synthetic fuel by then but I wouldn't hold my breath.
Check out the https://swzmaritime.nl/news/2022/11/08/how-abbs-braking-syst... 'wonder of the seas' e-brake system.
Interestingly, there are situations in which it might be helpful where it wouldn't have worked. For example, the Francis Scott Key Bridge incident. The vessel suffering from a blackout caused by a transformer being tripped by a single loose wire.
> The vessel suffering from a blackout caused by a transformer being tripped by a single loose wire.
Transformers don't 'trip'. Circuit breakers do.
Yes, it was a loose wire. But that vessel had regular diesel propulsion so that is not going to make any difference, loose wires can - and do - happen, usually with less far reaching consequences.
The point of the pods is that there are many of them, and they are somewhat redundant reducing the chance of such complete outages. It may well have prevented that particular accident but it may have caused another. This tech is just too new to draw any conclusions.
As far as I understand it every pod has its own dedicated power infrastructure section (batteries, drivers), with the ability to maintain symmetrical drive even in light of multiple failures. So these are right now not for normal propulsion on ocean going vessels (though in a diesel-electric setting they could already be used like that and there are a couple of vessels that use them but I'm not sure if that is for main propulsion as well), but these 'captive torpedos' definitely have a lot of potential.
I'm not sure what this pedantry adds. It's pretty common to say that a piece of equipment tripped for example whole power stations, a generator, a pump etc. When of course it's the circuit breaker protecting that equipment or even occasionally something like a physical over speed trip.
The pod drive architecture, and diesel electric more generally, only makes sense when the other benefits outweigh the efficiency losses of converting from mechanical to electrical and back again. It's very difficult to beat a shaft connected directly from the flywheel to the propeller.
Unless you have a large sail to generate thrust to spin the propeller...
Also wave based generators that could also act as dampers/suspension and they wouldn’t steal energy from forward motion like wind would (depending on if you’re generating wind energy or using wind to buttress the batteries).
Ideally a combination of sails coupled with batteries and wave generators sounds like it would be very energy efficient.