DuroMax XP15000EH

~$3,199approx. list price

800 WLights, phones, router, a CPAP
2,200 WFridge, freezer and the essentials
4,000 WFurnace blower, sump pump or a window AC
7,500 WWell pump or a small central AC
18,000 WWhole home with central air

12,500 W running, 15,000 W surge — sustains the well pump or a small central AC tier and everything below it.

Best forLarge-home owners in all 50 states who want a 50-amp portable that is certified for California and will pair it with a large propane tank.

DuroMax's big V-twin, aimed at the owner who wants to run most of a house through a 50-amp transfer switch. It makes 12,500 running watts on gasoline and 11,400 on propane from a 713cc engine, with four 20-amp outlets plus L5-30R, L14-30R and 14-50R on the panel, and it carries CARB and 50-state certification, which most big DuroMax units do not. The cost is size and noise. At 380 lbs and 83 dB it is about 9 dB louder than the 74 dBA Westinghouse WGen14500DFc, which is a large gap, there is no recoil start, and the spec sheet suggests a 60 lb propane tank minimum, so a standard 20 lb cylinder will not run it for long. At $3,199 it lists $300 under the Westinghouse WGen14500DFc, which is rated 2,000 watts higher, so the choice comes down to whether you need DuroMax's 50-state certification or the Westinghouse's extra output.

From the spec sheet

Specifications

Running watts: 12,500 W
Starting watts: 15,000 W
Fuel tank: 10.6 gal
Runtime: Gas: 18 hrs at 25% load, 8 hrs at 50% on 10.6 gal; propane: 16 hrs at 25%, 8 hrs at 50% (60 lb tank suggested)

Type: Portable Generator
Fuel: Dual Fuel (Gas/Propane)
Noise: 83 dB
Outlets: 4x 120V 20A GFCI (5-20R), 1x 120V 30A (L5-30R), 1x 120/240V 30A (L14-30R), 1x 120/240V 50A (14-50R)
Transfer-switch ready: Yes
Weight: 380 lbs
Warranty: 3-year residential, 1-year commercial
Model: XP15000EH