We have an inverter/charger on out 5er. All the electrical - except the water heater and AC's are run off it. I have power for (almost) everything all the time (off the batteries). I find a 2000 watt generator works well for charging the batteries, and I can program with a few buttons the input of my I/C to 10 or 15 amps, if the load is more then that, it will switch to inverter off the generator and run the load, switching back to the generator when it is done. I run the coffee pot, microwave, toaster, and lighting all off an old Costco 2000 generator. Within the limits of my battery bank, I can do all of that without the generator as well, but the batteries don't last long with a 200-300 amp load. The 2000 will burn less fuel then the 3500 at very small loads, run it close to rated power, and the larger generator at 1/2 load usually burns less fuel.