The numbers
| Per day | 2.0–6.0 kWh |
|---|---|
| While running | 300–800 W (older motors), 100–300 W (newer ECM motors) |
| Starting surge (plan for) | up to about 1,200 W |
A gas furnace still needs electricity for the blower. No power, no heat.
Tip: It's one of the most important things to back up in a winter outage.
Answer a few taps in a guide and every page like this shows the numbers for your own setup. Start
Running it on solar in Montana
At typical use (about 4.0 kWh a day), it takes about 6 400-watt panels to keep up through December in Montana, plus batteries for the nights.
Sized for your saved location (NASA data). Change location · Size a whole system
How long a battery runs it
On its own, at typical use:
Questions people ask
How long will a power station run a gas furnace fan?
A 2 kWh power station runs it for about 9 hours on its own, at typical use. Bigger batteries scale up from there.
How much solar does a gas furnace fan need?
About 2000 W of panels covers it in a typical US winter month, on its own.
Power it for good
Want it running through outages, or off-grid for good? The guides size everything around what you run.
Typical ranges for planning, from US Department of Energy appliance estimates, nameplate ratings and owner measurements. Your model's label or a plug-in meter gives your exact number. More: How much power do you use?