Generac GP8000E COsense vs Pulsar G12KBN Dual Fuel 12000W
The Pulsar G12KBN Dual Fuel 12000W is the more powerful unit: 9,500 running watts against 8,000 — about 16% more capacity for the Pulsar G12KBN Dual Fuel 12000W. The Pulsar G12KBN Dual Fuel 12000W offers more fuel flexibility (gasoline, propane) where the Generac GP8000E COsense runs on gasoline. The Pulsar G12KBN Dual Fuel 12000W runs longer at half load — 13 hours on its 8-gallon tank vs 10 hours.
| Generac GP8000E COsense | Pulsar G12KBN Dual Fuel 12000W | |
|---|---|---|
| Type | portable | portable |
| Fuel | gasoline | gasoline, propane |
| Running watts (gas / LP for standby) | 8000 W | 9500 W |
| Starting watts (gas) | 10000 W | 12000 W |
| Running watts (propane) | — | 8550 W |
| Starting watts (propane) | — | 10800 W |
| Runtime at 50% load (gas) | 10 h | 13 h |
| Fuel tank | 7.9 gal | 8 gal |
| Output voltage | 120/240V | 120/240V |
| Transfer-switch-ready outlet | 30 A | 50 A |
| Outlets | — | 4x 5-20R, L14-30R, L14-50R, 12V DC |
| Start type | electric | electric |
| CO safety shutoff | Yes | — |
| CARB compliant | — | Yes |
| Engine | — | Ducar OHV |
| Engine displacement | 420 cc | 457 cc |
| Weight | 198 lb | 209 lb |
| Warranty | — | 3 yr |
Frequently asked questions
Which is more powerful, the Generac GP8000E COsense or the Pulsar G12KBN Dual Fuel 12000W?
The Pulsar G12KBN Dual Fuel 12000W, at 9,500 running watts on its best fuel versus 8,000 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 Generac GP8000E COsense or the Pulsar G12KBN Dual Fuel 12000W?
Estimated fuel for 24 hours at about 50% load: $61 on gasoline for the Generac GP8000E COsense vs $47 on gasoline for the Pulsar G12KBN Dual Fuel 12000W, 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.