I've got some lithiums and an inverter and 3 ways to charge them. From the alternator and ac. The third way is from a home made generator. Lawnmower engine and an alternator run from propane. Decided not to get a store bought generator because I already have an inverter. And most generators are gas driven which brings in several problems. My little solution was fun to make, cost me about $100. It's relatively light and quiet and will run for 2 daze on a 20 pound tank. The output is limited to 30 amps because I put it through a B2B.