At 100 hours per cycle, current generation LiFePO4 batteries will last decades. Maintenance would consist of swapping out faulty modules.
Electric motors are far more robust than ICEs. Wear parts consist of bearings and cooling (although this last is much simpler at 90% efficiency than 50%).
The control circuitry is a potential failure point, but it's small enough that you could run two or three redundant versions and maintain the one that is off.
It sounds like you've included the solution for on board power. Keep using the same generators where they too aren't replaced with batteries (or on board solar may be viable) or in extreme edge cases, use one of the existing ships -- they're not all going to he retrofit on day one.
Electric motors are far more robust than ICEs. Wear parts consist of bearings and cooling (although this last is much simpler at 90% efficiency than 50%).
The control circuitry is a potential failure point, but it's small enough that you could run two or three redundant versions and maintain the one that is off.
It sounds like you've included the solution for on board power. Keep using the same generators where they too aren't replaced with batteries (or on board solar may be viable) or in extreme edge cases, use one of the existing ships -- they're not all going to he retrofit on day one.