Chance-As I understand it, the generator is different from shore power because it only produces 115-Volts and with only one leg. This means that in order for all coach electrical to get power from generator, both legs in electrical panel have to be connected together.
Is it possible that the generator has two 120 V outputs (two circuit breakers)? Could they each be referenced to the same ground, so there is 0 volts between the two outputs and 120 volts between the neutral and each output (hot). But that would mean that the neutral would be carrying double the amperage when both AC units are running.
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