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Generator Load List Builder

Turn a list of backed-up items into running load, starting surge, and the kW/kVA a generator must carry.

Inputs

Inputs and assumptions

Add nameplate watts of everything on the backup list.

Not everything runs together. 70-85% is typical for a home.

Well pump, A/C compressor, air compressor, or furnace blower.

Starting watts per running watt. 3 for most motors, up to 5 for hard-starting ones.

Alternators are rated at 0.8 PF. Lower PF needs a bigger kVA.

Headroom for the next appliance you buy.

Result

Alternator rating to specify
—
Generator rating to specify
—
Expected load factor
—
Peak load with motor starting
—
Running load
—

What to check

  • Nameplate watts of every backed-up item
  • Motor starting amps or LRA from the nameplate

Related calculators

Screening-grade estimate built from labeled inputs and stated defaults. Verify the nameplate data, manufacturer fuel tables, adopted code edition, and installer quotes before you buy, wire, or run anything.

Saved calculations

Keep the assumptions with the result.

Save this calculation to return to the inputs, result, and report anytime.

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