The GP5500E puts out 5,500 W continuously and up to 6,875 W for a few seconds when a motor starts. It runs up to 10.5 h at 50% load on a full 5.4 gal20.5 L tank. It weighs 163 lb74 kg. It takes 0.74 qt0.7 L of engine oil, and the source recommends 10W-30 or SAE 30.
Specifications
Units: /| Power | |
|---|---|
| Running output | 5,500 W 1 |
| Starting output | 6,875 W 1 |
| Voltage | 120/240 V 1 |
| Engine | |
| Engine | Generac OHV with EFI (electronic fuel injection) 1 |
| Displacement | 298 cc 1 |
| Fuel | Gasoline 1Generac's product page lists the fuel type as "Gaseous", which looks like a copy error. |
| Starting | Electric start, with recoil pull start as backup 1 |
| Fuel and run time | |
| Tank | 5.4 gal20.5 L 1Generac's product page gives 20.4 L. |
| Run time | 10.5 h 1at 50% load13.4 hours at 25% load. |
| Size and noise | |
| Weight | 163 lb74 kg 1Unit weight from the spec sheet; shipping weight is 181 lb. Generac's product page lists 172 lb (86 kg). |
| Length × width × height | 27 × 27 × 25 in686 × 686 × 635 mm 1Generac's product page lists 30 × 27 × 25 in. |
| Outlets | |
| Outlets | 2 × 120 V 20 A GFCI duplex (5-20R) 1 × 120/240 V 30 A twist-lock (L14-30R) |
| Other | |
| CO shutdown | COsense 2 |
| Emissions certification | 50-state (50ST) 2 |
| Warranty | 3 years residential, 2 years commercial 1 |
Oil, spark plug and service
What to have on the bench before an oil change or tune-up.
| Oil capacity | 0.74 qt0.7 L 1Generac's product page lists 1.06 qt (1 L); the spec sheet for this engine says 0.74 qt. |
| Oil type | 10W-30 or SAE 30 1 |
We're still missing some service figures for this model. Have the owner's manual? Send it over.
Parts
Search links for common parts. Check the part number against the label on your unit before you buy.
| Part | Find it |
|---|---|
| Air filter | Amazon · eBay |
| Spark plug | Amazon · eBay |
| Battery | Amazon · eBay |
| Generator cover | Amazon · eBay |
We may earn a small commission if you buy through these links. It doesn't change what we list. More.
Model numbers
This page covers model numbers 8150, G0081500. Brands often sell the same name under several numbers with small differences, so check the label on the frame.
Compare
Often compared: Generac GP8000E, Westinghouse WGen7500, Generac GP6500, Honda EU7000iS
Questions people ask
How much oil does the Generac GP5500E take?
0.74 qt0.7 L. Oil type: 10W-30 or SAE 30.
How long does the Generac GP5500E run on a tank?
10.5 h. That's at 50% load, according to the source. More load means less time.
How much does the Generac GP5500E weigh?
163 lb74 kg. Unit weight from the spec sheet; shipping weight is 181 lb. Generac's product page lists 172 lb (86 kg).
What's the difference between 5,500 W and 6,875 W?
5,500 W is what it can supply continuously. 6,875 W is a short burst for the moment a motor (a fridge, a pump, an AC unit) starts up.
Sources
- Generac GP5500E spec sheet (model G0081500). Manufacturer, accessed November 11, 2026.
- Generac GP5500E product page (model 8150). Manufacturer, accessed November 11, 2026.
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