That is interesting. I do have a charger that is on a timer, but should not be able to be charging during this time period we are discussing as it should have been in the off cycle. I will check this to see.

My Chassis battery charger is connected to my Engine block heater outlet which has a master switch on my dash for the outlet. My outlet switch for the Block Heater is on (the block heater plug is disconnected) and the Chassis battery charger and the timer are plugged into this outlet. My point here is that if the charger was on it would have been charging as a result of the inverter producing AC to the Block Heater Outlet???? It was not, but when I turned on the Genset the voltage dropped from 29 to 25 the dash chassis battery charge light came on and the lights stopped surging. Go figure.