I haven't had enough time with the game to do in game testing. However, the fact that you can select to not charge the batteries while on the surface implies that it does take away power from the main diesels (like pto in a tractor or some kind of clutch) even thought both screws are turning (which I haven't verified). Either way, nothing regarding energy is free. I doubt they had the system set up turn the generators for recharging the battieries even when they didn't need to. It wouldn't make sense simply due to the resulting loss of efficiency it would create.
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