Standby vs. Portable Generators: Which One Fits Your Home
By LumoWatt Editorial Team · Updated 2026-08-02
The core difference
A standby generator is permanently installed outside your home, connects through an automatic transfer switch, and starts on its own within seconds of an outage. A portable generator has to be manually set up, fueled, and started every time the power goes out, and is typically run outdoors with extension cords or a manual transfer switch to a subset of circuits.
Side-by-side
| Standby | Portable | |
|---|---|---|
| Startup | Automatic, seconds after outage | Manual, you set it up each time |
| Fuel | Natural gas or propane, on-site tank or gas line | Gasoline, propane, or diesel, refueled manually |
| Coverage | Whole-home or a defined set of circuits, wired in | Whatever you can reach with cords, or a manual switch panel |
| Upfront cost | Higher, see our installation cost guide | Lower |
| Ongoing effort | Runs a weekly self-test, otherwise hands-off | You manage setup and fuel every outage |
Which one makes sense
A standby generator makes the most sense if you travel often, have medical equipment or a well/sump pump that needs to keep running without you being home, or simply don't want to manage equipment during a storm. A portable generator can be a reasonable lower-cost option for occasional, short outages if you're comfortable setting it up yourself and running it outdoors, well away from windows and doors because of carbon monoxide risk.
If you're leaning toward a standby system, the generator sizing calculator gives you a starting estimate for size and cost.
Ready to install? Find installers in your city.