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.

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pzo 3 days ago | parent [-]

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 3 days ago \| parent \| next [-]
		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.
	▲	labcomputer 2 days ago \| parent \| prev \| next [-]
		There already exist purpose-built chargers for electric ships. See, for example, https://www.stemmann.com/en/products/charging_systems/ferryc... To support a 48 hour recharge of the battery hypothesized upthread, you would only need to scale up this system by about 10x. Or attach 10 along the length of the ship. Or some combination of those options. This is a non-problem. Edit: Excuse me, but I misread the brochure. The existing system need be only scaled up by a factor of 2.5x to recharge a container ship in 48 hours.
	▲	londons_explore 3 days ago \| parent \| prev \| next [-]
		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.
	▲	_fizz_buzz_ 3 days ago \| parent \| prev [-]
		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.