DuroMax XP5500EH Dual Fuel vs Generac GP6500 COsense
The Generac GP6500 COsense is the more powerful unit: 6,500 running watts against 4,500 — about 31% more capacity for the Generac GP6500 COsense. The DuroMax XP5500EH Dual Fuel offers more fuel flexibility (gasoline, propane) where the Generac GP6500 COsense runs on gasoline. The Generac GP6500 COsense runs longer at half load — 11.5 hours on its 7.9-gallon tank vs 9 hours.
| DuroMax XP5500EH Dual Fuel | Generac GP6500 COsense | |
|---|---|---|
| Type | portable | portable |
| Fuel | gasoline, propane | gasoline |
| Running watts (gas / LP for standby) | 4500 W | 6500 W |
| Starting watts (gas) | 5500 W | 8125 W |
| Running watts (propane) | 4275 W | — |
| Starting watts (propane) | 5225 W | — |
| Runtime at 50% load (gas) | 9 h | 11.5 h |
| Fuel tank | 4 gal | 7.9 gal |
| Output voltage | 120/240V | 120/240V |
| Transfer-switch-ready outlet | — | 30 A |
| Start type | electric | recoil |
| CO safety shutoff | — | Yes |
| Engine displacement | 224 cc | 389 cc |
| Weight | 124 lb | 172 lb |
Frequently asked questions
Which is more powerful, the DuroMax XP5500EH Dual Fuel or the Generac GP6500 COsense?
The Generac GP6500 COsense, at 6,500 running watts on its best fuel versus 4,500 W. Remember that dual-fuel and natural-gas ratings are lower than gasoline ratings — the comparison table shows the published per-fuel figures.
Which costs less to run, the DuroMax XP5500EH Dual Fuel or the Generac GP6500 COsense?
Estimated fuel for 24 hours at about 50% load: $34 on gasoline for the DuroMax XP5500EH Dual Fuel vs $53 on gasoline for the Generac GP6500 COsense, at national average prices. These are spec-sheet-derived estimates — the assumptions are on the methodology page, and different fuels make this a cost comparison, not an efficiency ranking.
Where do these specifications come from?
Every record on BackupAtlas is hand-curated from manufacturer documentation and spec sheets, and each generator page links to its source document.