start by going to circuit breaker panel.
and turn each and every one of them off, all the way off, then back on
IF it does not start charging, goto your electric bay
and check the switches, push button circuit breakers, and fuses on the charger-inverter ? combo unit
do you have a portable battery charger
connect that to your house batteries and plug it in
and get your batteries charged
there is more at stake than your lights
you a/c controls and LP fridge controls need 12v, or they won't work
and your food will spoil