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Generator Size Calculator

Add the appliances you need during an outage and find the running and starting watts your generator must supply.

What you want to powerWattsQtyHours/day

How it is calculated

Running watts = sum of all appliances you run at once. Starting watts = running watts + the single largest motor surge (fridges, pumps, AC compressors start at 2–3× their running watts). We add a 20% safety margin. Fuel use is estimated at typical half-load consumption for a generator of that size.

Results are estimates for planning, not bills or professional advice. For generator hookups use a transfer switch installed by a licensed electrician.

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