Portable vs Standby Generator: Which Do You Need?
Portable or standby generator? A plain-spoken comparison of cost, power, fuel, convenience and install — so you can pick the right kind of backup power for your home.
The choice between a portable and a standby generator comes down to one trade: cost versus convenience. A portable is cheap and flexible but hands-on; a standby is expensive but automatic and covers the whole house. Here’s the honest side-by-side, and a clear pick for each buyer.
| Portable | Standby | |
|---|---|---|
| Typical cost | $400–$2,000 + transfer switch | $7,000–$15,000 installed |
| Power | Essentials (5,000–9,500 W) | Whole house incl. central AC (18–26 kW) |
| Fuel | Gas, dual-fuel, propane (you refuel) | Natural gas or propane (permanent supply) |
| Start-up | Manual — roll out, fuel, start | Automatic within seconds of an outage |
| Install | Transfer switch / interlock by an electrician | Full pro install, pad, ATS, permit |
| Runtime | Hours per tank; refuel by hand | Days on natural gas; unattended |
Choose a portable if…
Outages are rare or brief, you mainly want to protect food and heat, and you’re comfortable rolling the unit out and refueling it. It’s the budget-friendly path — pair it with a transfer switch and see the best portable generators.
Choose a standby if…
You face frequent or long outages, work from home, rely on a well or sump pump, need medical equipment, or simply want hands-off whole-house backup including central AC. See the best whole house generators and price it with the cost estimator.
Either way, size it first with the generator sizing calculator.
A whole-house standby must be installed by a licensed electrician. Never run a portable generator indoors or in a garage — the exhaust contains carbon monoxide.
Frequently asked questions
What is the difference between a portable and a standby generator?
A portable generator is a wheeled unit you roll out, fuel and start yourself, connecting through a transfer switch or interlock to power selected circuits — cheaper, but hands-on. A standby generator is permanently installed outside, runs on natural gas or propane, and starts automatically within seconds of an outage to power the whole house through an automatic transfer switch — far more convenient, but several times the cost.
Is a standby generator worth it over a portable?
If you face frequent or long outages, work from home, have a well or sump pump, or need medical equipment, a standby is often worth it — it’s automatic, runs on your gas supply for days, and covers the whole house including central AC. If outages are rare and brief and you mainly want to protect food and heat, a portable covering essentials is far cheaper and enough. It comes down to how often and how long your power goes out.
Can a portable generator run a whole house?
A portable can run a home’s essentials — fridge, furnace blower, a pump, lights and Wi-Fi — through a transfer switch or interlock, but it generally can’t run central air conditioning and everything at once, and you have to fuel and start it by hand. For automatic, whole-house backup including AC, you want a standby generator. Size either with the generator sizing calculator.