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Usually generators are not sized for the entire house load. At 200 Amps and 240 volts that would be a 48 KW generator. You can get by with less by just creating a transfer electric panel with critical circuits. You can probably get by with a 20 KW generator.

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13y ago
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12y ago

Usually you size an emergency generator for the emergency load, not necessarily the total load under normal operations. This emergency load is moved to a separate panel that is connected through a transfer switch to the generator. Once you size this emergency load you will have a more precise answer. I have used a 12 KW generator on a 5 bedroom house and it has always been adequate in emergencies. It powers well pump, propane furnaces, AC, kitchen appliances, washer and dryer, living area outlets and lights and some additional lights.

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Q: What size generator for 200 amp service?
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