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Generac GP15500EFI (7705) vs. Generac Guardian 22kW Standby
| Generac GP15500EFI (7705) | Generac Guardian 22kW Standby | |
|---|---|---|
| Running watts | 15,500 W | 22,000 W |
| Starting watts | 19,300 W | 22,000 W |
| On propane | — | — |
| Type | Open frame | Home standby |
| Fuel | Gasoline | Propane / natural gas |
| Noise (mfr figure) | — | — |
| Weight | 420 lb | — |
| Fuel tank | 14.2 gal | — |
| Runtime (mfr claim) | ~11 h at 50% load | — |
| Outlets | Four 20A 125V GFCI, L14-30R (transfer switch), 14-50R (240V/50A), L5-30R | Hardwired via automatic transfer switch |
| Start | Electric | Electric |
| CO shutoff | Yes | Check listing |
| Approx. price | ~$4,219 | ~$5,700 |
Dashes mean the manufacturer doesn't publish that figure. Wattages are gasoline ratings. Prices are typical street prices as of July 2026 — check current listings.
What the spec sheet actually says
- The Generac Guardian 22kW Standby gives you 6,500 more running watts for about $1,481 more.
- They're different classes: open frame vs home standby — the inverter class runs quieter and makes cleaner power; open-frame buys more watts per dollar.
Generac GP15500EFI (7705)
Full review →Generac Guardian 22kW Standby
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