Guys, its simple math. If Gen is capable to run pump, fan and compressor, just plug it directly as mostly AC unities can switch them on in phases to not overload the system at start-up. If not, using your inverter will drain the missing power from batt and these will deplet if you don't charge at same rate, without limit. Add more by using the inverter loss. I agree you can run it for a while then charge the used amps later, but you are simply taking the missing power form your batts; an idea used by Martervolt to create the power combi.
Beneteau Oceanis 43
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