6000 watt Coleman generator in a shed that is wired to a completely separate system. We have an outlet in every room for lamps and the freezer and refrigerator. The furnace is connected via its own breaker so our electricity does not flow into the grid.
Gasoline is the only issue but I keep rotating through a couple of 5 gallon jerry cans to keep it fresh. Haven't had to use it in four years but you never know, you know.
Free
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