You say you are doing a parallel hybrid. I have used the Steyr system in my 12m solar cat. My assumption is that your system, like my Steyr one, charges the battery while the diesel is propelling the boat. I have a 48Vdc LFP battery pack.?

You should not need additional generator(s). Since you’ll have two systems, you can also run one side on diesel abd the other on electric if your battery is low. This uses less fuel than running both motors on diesel at similar speeds.?

at anchor, you can also run one diesel in neutral to charge the battery. Since you generate DC power, this is more efficient than running an AC generator and converting to DC.?

while you’re at it, I’d suggest you run all your AC loads thru inverter(s) using shore power to only charge your battery thru a dedicated charger.?

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Well, there’s no actual system yet except in my head.
I would certainly like the ability for the motor to act as a generator when running under diesel.
i understand though that it depends on the type of motor - AC, BLDC, BDC? Still learning...

Question - if we did have a 10kW continuous motor Acting as a generator, probably using a 2:1 or 3:1 reduction (or opposite!) to keep the same prop as diesel, how much of the diesel power will I lose to the New “alternator” and how much of that will actually get back to the batteries? ?For example, if at half max rpms the diesel is putting out 20 kW (in hp :), would I lose half the 10kW =5kW into the electric-now-generating? So only 15kW getting to prop (ignoring loss for stern gland)? ?If so, how much of the 5kW would actually recharge the batteries - ie. would a 90% efficient motor recharge at 90% to?

We will definitely be running all DC if possible.

There’s no free lunch. If the motor is generating 5kW then you’ll be using 5kW if diesel plus at Keats 10% for losses. that said, it’s more efficient than adding a stand alone generator?
making the same 5kW ??

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