do you mean NO lights, NO water pump
or do you mean NO 120vac power
batteries power your 12v lights water pump, etc
the built in charge converter also supplies power for 12v items, and charge the RV-house battery when you run the generator or plug in
for 120v power for your outlets, TV, A/C, etc..you run the generator, or plug in somewhere
or
install a 12vdc to 120vac "INVERTER' and more batteries
that way you can watch TV at night using inverter power
the next day
you then run the generator to 'recharge' the battery power you used
I can explain it to you.
But I Can Not understand it for you !
....
Connected using T-Mobile Home internet and Visible Phone service
1997 F53 Bounder 36s