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Last updated: October 31, 2026
THE SHORT ANSWER
A furnace fan, yes, easily — it draws roughly 300–600 watts running. A sump pump, usually — a common ⅓-horsepower pump runs near 800 watts but can surge past 2,000 watts at startup, so it wants a station with at least 2,000 watts of output and only runs in bursts. A well pump is the hard one: many are 240-volt, and a standard power station only makes 120 — no adapter fixes that. For 120-volt pumps, the rule is the same everywhere on this page: the station has to survive the motor’s starting surge, which is two to three times its running watts.
Fridges are forgiving loads; motors are not. A motor at rest pulls a gulp of power in its first second — the nameplate running watts are the polite number, and the surge is the one that trips stations. So this page runs on two numbers per load: what it drinks, and what it gulps.
The three loads, honestly sized
| Load | Running watts | Starting surge | Verdict |
|---|---|---|---|
| Furnace fan (gas furnace blower) | 300–600W | ~1,000–1,500W | Runs on most 1kWh+ stations |
| Sump pump, ⅓ HP | ~800W | ~2,000–2,900W | Needs 2,000W+ output; runs in bursts |
| Sump pump, ½ HP | ~1,050W | ~2,500–3,200W | Top end of station output; test before the storm |
| Well pump, ½ HP, 120V | ~1,000W | ~2,000–3,000W | Possible on big stations; runtime is minutes-to-hours |
| Well pump, 240V | — | — | Standard stations cannot run it at all |
Station output, for scale: the 2kWh class in our power station comparison delivers 2,200–2,600 watts of AC output, which covers the furnace fan with room to spare and the common sump pump with less room than the brochure implies. Runtime is the second wall: a 2,000Wh station running a furnace fan at 500 watts gives roughly three to four hours of fan — which, because a gas furnace only runs its fan in cycles, can be most of a cold day’s heat. A sump pump in a storm is the reverse problem: bursts of high draw against rising water, and the pump, not the battery, decides the schedule.
How to size yours before the sky does it for you
- Read the pump’s nameplate, not the forum. Amps × volts is watts; multiply running watts by three for a surge estimate when the maker prints no surge figure.
- Test on a dry day. Plug the pump into the station, pour two buckets in the pit, and watch it start under load. A station that starts your pump in October is a plan. One you have never tried is a hope.
- Sequence the loads. Never start two motors on one station at the same moment — stagger them by minutes and the surge problem halves.
- For the 240V well, the answer is a generator or a transfer setup, not a bigger portable station — that division of labor is exactly the setup in automatic backup with no solar, and the generator side is compared in our portable generator comparison.
- Sleep loads stay protected: if the same station carries a CPAP through the night, the pump budget comes out of what’s left.
Questions people also ask
Will a power station run a furnace in a gas or oil system?
The furnace itself burns its own fuel — the electricity runs the blower and the controls, a few hundred watts. That is the best bargain in outage heating: a modest station keeps a gas or oil furnace heating the house in cycles for many hours. Electric furnaces and heat pumps are a different universe of watts and are not station loads.
Can a station run a sump pump all night in a storm?
Only if the water cooperates. A pump cycling every few minutes against heavy inflow can drain a 2kWh station in a few hours. The honest storm plan pairs the station with a water-powered backup pump or a generator recharge — sized before the season, not during it.
What about a refrigerator’s compressor surge?
Real but small — a modern fridge surges a few hundred watts for a fraction of a second, which any station in the comparison class absorbs without noticing. It is covered in the fridge runtime math.
Related questions
- How long will a power station run a refrigerator?
- How long will a power station run my CPAP?
- Automatic backup with no solar
This question sits in What People Are Asking About Backup Power — the full list of backup-power questions from real forums, each with a short answer.
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