Wow great advice, I don't think it was heat that caused the fans to operate all night because it was a cold night, everything DC was off and we don't run the furnace after we go to bed. We were plugged into shore power so possibly it was trying to recharge my batteries but I just charged them before I left. there voltage read was 13 volts on Sunday 2 weeks after getting home. I do like the idea of swapping it out is it a confusing and difficult task, I can wire my house but I don't have the same confidence level here?