In my case, it's cheaper to run the furnace at night than run a Onan 5500 generator. Of course, this is where the use of a second battery comes into play. If you have a two 12v battery setup, you will have plenty of battery reserve to run the furnace, water pump when needed, turning on lights when needed during the night. You can run the generator during the day when the batteries need to be recharged.
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