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I use a small 2300w inverter generator, purchased two of them for my site power for building this house, at least one ran almost every day for 8hrs for 1 1/2 years, they still run well. I can run a furnace and fridge or freezer no problem. We don't usually get long power outages so not too worried about running everything at once. My backup cooktop is portable induction.

EDIT, My furnaces run ECM blower motors so low wattage especially at startup compared to reg AC blower.