Generator Size Calculator
Size a standby generator from your appliances' running and starting watts, free online.
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Add the running watts of everything you want to power at once, then add the single largest starting surge (motors and compressors start at 2–3× running watts). Add 20% headroom. kVA = kW ÷ 0.8 (typical power factor). Enter each appliance as "name: running watts, starting watts".