GenSize generator sizing

What size generator runs a home office?

Pre-computed outage scenario using the same GenSize formula.

Formula

Running watts + largest startup delta, then 25% headroom.

2.2k4.5k7.5-8.5k9.5-12.5k

Use the about 2,200 W inverter class as the starting estimate for Desktop computer plus monitor, Router plus modem, LED lights x10.

Running 430 W + largest start delta 0 W = 430 W peak. Add 25% headroom: 538 W.

Sizing estimate only - confirm with a licensed electrician; never backfeed a panel.

Loads used

LoadRunning WStarting WNote
Desktop computer plus monitor300300typical electronic load
Router plus modem3030typical electronic load
LED lights x1010010010 bulbs at 10 W each

Models in this class

Honda EU2200i

1,800 running / 2,200 starting W. gasoline.

official Honda technical specifications list 2200 W max and 1800 W rated

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Champion 201317

1,850 running / 2,500 starting W. gasoline.

current 2500 W Champion inverter used as successor-class substitute for 100692

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Why the estimate can change

Use nameplate watts when available. Pumps, compressors, altitude, fuel type, and extension-cord voltage drop can all change the practical generator size.