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Update on an old post; I decided to go with a Kohler 20k , dual fuel, nat. gas or propane, standby unit WITHOUT auto switching. It fired right up and seems to run just fine using propane. I did run a permanent 120 volt feed which is used to keep the battery charged up when not running. Battery required is a small R51 car battery. I found the exhaust system a bit odd, the engine dumps all exhaust gas inside the unit and fans draw cool, outside air in one end and pushes it out the other end. I assume this helps keep the noise level down somewhat.