Unlike older gas-only generators, ones that run on propane offer a higher degree of versatility because they can be connected to handy 20-pound tanks or larger whole-house propane tanks.

The best portable propane generators can run continually for 150 to 200 hours. As long as the propane tanks for generators are large enough, a standby propane generator can run for several weeks.

Dual-fuel generators also give you more control over secondary factors like noise and emissions: Gas is easy to get at any station, but propane burns cleaner and quieter. The best dual-fuel ...

(Propane tanks are separate, and natural-gas models are fueled externally.) Weight for stationary models, which stay where installed, is "NA," for not applicable. Only some generators with this ...

(Propane tanks are separate, and natural-gas models are fueled externally.) Weight for stationary models, which stay where installed, is "NA," for not applicable. Only some generators with this ...