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Makes perfect sense! They should use the same de-rating specs across the entire line, meaning that 1000w with the inverter would surely power like 3 of the PPS in charge mode. But you would need like #4 AWG copper wire to connect to your vehicle's alternator :D

the 'vehicle' is a boat.
I'm remodeling an old houseboat.

I know its unlikely, but damn do I hope we get to see that thing.