Generac 18kW Standby 7324
#5 in 15 to 22 kWFull review
For average homes with one central air conditioner that want a whole-house switch included.
Amazon $5,975.10$5,975.10
3.2/5
For average homes on natural gas that want full rated output and a long warranty with service included.
- 18 kWPropane
- 18 kWNatural gas
- Included, 200 ATransfer switch
- 7 yearsWarranty
Check price at Norwall$6,899
Price checked November 1, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Full 18 kW on natural gas as well as propane, so no output loss on a gas line
- Seven years of parts, labor and travel cover
- Remote monitoring built in, no add-on to buy
Cons
- Load management needs the separate Symphony II module
- Costs more than Generac and Champion 18 to 22 kW kits
The Briggs & Stratton PowerProtect+ family
Every Briggs & Stratton PowerProtect+ model we rank, smallest first. Ratings compare each against its own size.
| Model | Propane | Rating | Price |
|---|---|---|---|
| Briggs & Stratton PowerProtect+ 18kW (this one) | 18 kW | 3.2/5 | $6,899 |
| Briggs & Stratton PowerProtect+ 22kW | 22 kW | 3.4/5 | $7,289 |
| Briggs & Stratton PowerProtect+ 26kW | 26 kW | 3.3/5 | $8,069 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | 40765 (generator 040757) |
|---|---|
| Output | |
| Rated output, propane | 18 kW |
| Rated output, natural gas | 18 kW |
| THD | Under 5% |
| Engine | 993 cc |
| Engine speed | 3,600 rpm |
| Install | |
| Transfer switch | Included, 200 A |
| Load management | No |
| Remote monitoring | Yes |
| Enclosure | Aluminum |
| Dimensions | 46 x 27 x 28 in |
| Weight | 490 lb |
| Noise and warranty | |
| Noise, normal operation | 66 dBA |
| Noise, weekly self-test | 62 dBA |
| Warranty | 7 years |
| Released | 2026-05 |
Alternatives in this size
Cummins Quiet Connect RS20AC 20kW
#6 in 15 to 22 kWFull review
For homes with central air that want a quiet 20 kW unit with monitoring included and a service-entrance switch in the box.
Norwall $6,662.42$6,662.42
Cummins Quiet Connect RS17A 17kW
#8 in 15 to 22 kWFull review
For average homes on natural gas that want full rated output and built-in monitoring from a commercial power brand.
Norwall $6,264.97$6,264.97
Compare
Compare the Briggs & Stratton PowerProtect+ 18kW with any other standby generator →
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