Briggs & Stratton PowerProtect 12kW (040666) vs Briggs & Stratton PowerProtect DX 13kW (040740)
The Briggs & Stratton PowerProtect DX 13kW (040740) is the more powerful unit: 13,000 running watts against 12,000 — about 8% more capacity for the Briggs & Stratton PowerProtect DX 13kW (040740). The Briggs & Stratton PowerProtect DX 13kW (040740) is the quieter of the two (69 dBA vs 70 dBA — though manufacturers measure noise at different loads and distances). Warranty favors the Briggs & Stratton PowerProtect DX 13kW (040740): 10 years vs 6.
| Briggs & Stratton PowerProtect 12kW (040666) | Briggs & Stratton PowerProtect DX 13kW (040740) | |
|---|---|---|
| Type | home-standby | home-standby |
| Fuel | natural-gas, propane | natural-gas, propane |
| Running watts (gas / LP for standby) | 12000 W | 13000 W |
| Running watts (propane) | 12000 W | 13000 W |
| Running watts (natural gas) | 10800 W | 11500 W |
| Noise level | 70 dBA | 69 dBA |
| Output voltage | 120/240V | 120/240V |
| Automatic transfer switch included | No | No |
| Main-line circuit breaker | 60 A | 70 A |
| Start type | automatic | automatic |
| Engine | Briggs & Stratton Vanguard M38 | Briggs & Stratton Vanguard |
| Engine displacement | 623 cc | 627 cc |
| NG use at half load | 117 ft³/h | — |
| Propane use at half load | 1.7 gal/h | — |
| Weight | 361 lb | 315 lb |
| Warranty | 6 yr | 10 yr |
Frequently asked questions
Which is more powerful, the Briggs & Stratton PowerProtect 12kW (040666) or the Briggs & Stratton PowerProtect DX 13kW (040740)?
The Briggs & Stratton PowerProtect DX 13kW (040740), at 13,000 running watts on its best fuel versus 12,000 W. Remember that dual-fuel and natural-gas ratings are lower than gasoline ratings — the comparison table shows the published per-fuel figures.
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.