There was no suggestion to attempt to operate an Air Cond on battery power , only to allow the start surge to be taken care of by the inverter.
As second far cheaper solution is possible .
IF the boat does stay cool , the RV folks sell a unit that will only allow one unit to operate at a time.
A simple relay and you could roll your own , load shedding unit.
Single staggered operation might require a bunch of exterior curtains over the windows to handle big sun loads.
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