I would not share a starting battery with the main engine. I would (and do) have a separate battery only for generator starting. Hooked up to nothing else.
That way if (and when) you discharge too deep the gen battery is always ready to either start the gen to recharge the main battery, or to jump start the main engine.
I have been there once or twice.
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Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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