Generator sizing & cost calculator A starting estimate, not a load calculation. A certified installer will size your unit based on your actual electrical panel. Use this to get in the right ballpark before you request quotes, and treat the result as preliminary until a qualified installer confirms it.
What do you want backed up? Essential circuits only Refrigerator, well pump, a few lights and outlets, one AC zone. Most of the home The above, plus most lighting circuits and a larger AC system. Whole home Everything, including multiple AC zones and an electric range/dryer.
Major loads in your home (optional)
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