MNRon wrote:
Does AC mean one or two 15kW ACs? If two, most likely that sucked up most of the power the genny could provide and starved the battery recharge. I don’t know what converter you have, but if standard it probably can’t provide more that ~50A per hour to the batteries (or less); that would require 4hours of charging for two fully depleted 100AHr batteries.
Unless the generator has some kind of sophisticated load shedding feature that prioritizes some circuits over others, I don't think this is how it works- if the generator were overloaded it should trip its main breaker. (I'm assuming you meant 15K btu, not 15kW)