I have the Kohler generator. It has 16 circuits
and one of the circuits feeds 120 volts to the generator to keep the battery charged. It's regulated at 2amps. It's programmed to run for 20 minutes every week. When hurricane Sandy hit the East coast last Oct we lost power for 26 hours
and the generator started automatically. I stopped it every 8 hours to check the oil level. My neighbors were calling to see why I had lights.