There is already a net loss of battery charge with prolonged running on diesels, (obviously without recharging!), but it's a tiny rate, in the rough order of 100Ah, and the rate doesn't seem to vary, except by reducing the brightness of the lighting.
As regards the hydraulics, the safest (least awful!) system would be an electrically-powered hydraulic pump, hydraulic accumulator and hydraulic motor in one place near the driven service, to minimise the length of pressurised hydraulic piping, and thus minimise the risk of a cloud of highly flammable hydraulic fluid in the boat during depth charging.
So it'd expect the hydraulic services to involve an electrical load every time they're used, simply to replenish the hydraulic accumulator.
I'd be interested to know how Jerry did mitigate the risks of using hydraulics.
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