If I am using a 5500 Watt Generator for RV, should I use inverter? So confused…?

I'm a young guy trying to live in an RV. I have a 5500 WEN generator. It is an early 70's model RV. Should I get something that can store the power i'm producing to last through the night, or should it just charge my accessory battery? Someone just explain in laymen's terms what I should do to conserve and produce the most energy with my generator. Even if it means using solar panels.
WEN is the brand name, it has 120 output, I have it converted to use the 4-prong plug thing, sorry im dumb when it comes to this stuff.