I use a 2000 watt inverter generator. Nothing fancy. I bought the cheapest one I could find, Sam’s club 350$. It sips the gas, and it’s pretty quiet. For the whole trip it used maybe 2.5 gallons. I don’t really know if it ever fully recharged the batteries, but I ran it for about 4 to 5 hours a night. I have an minnkota onboard charger for my 24 volt battery bank for the trolling motor. It’s nice to charge phones, have a real light in the tent and to watch a movie.
I wish this little generator would run my a/c for the summer, but it’s not powerful enough. For the summer I have to bring my 3500 watt, which sucks because it’s twice as heavy.