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Are you plugged into a 30 amp rated or a 50 amp rated service and any adapter being used on the cord? Batteries full of water and less than 3 years old?
And can you give me the make and model of your load center where all the fuses and breakers are? Most of these were made by Magnetek or WFCO. That would help me direct you better. The AC is powered by 12 VAC unless it has direct ceiling controls........hence the battery question.