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Guide: heat in an outage

How long will a gas furnace blower run on a battery?

A 2 kWh power station runs a 350 W furnace blower for about 4.4 hours if it never stops, and about 7.6 hours on a cold night when it cycles. A 1 kWh unit gives about half that.

About 4.4 h
350 W blower running nonstop on a 2,042.8 Wh unit
About 7.6 h
Same unit, blower on 58% of the time

Our arithmetic from utility wattage charts and Jackery's stated capacity, read Oct 7, 2026. See source

A dark street during a power outage with one window lit.
On this page
  1. Key facts
  2. The arithmetic
  3. Estimated hours for a 350 W furnace blower
  4. Output and the start-up kick
  5. Getting the furnace onto the battery
  6. Units with the surge for a blower
  7. Furnace questions
  8. Sources

Key facts

  • Two utility charts list a furnace fan motor at about 350 W12.
  • Otter Tail Power's chart puts intermittent use at 160 to 415 hours a month: the blower running 22 to 58 percent of the time (our arithmetic)1.
  • A 2,042.8 Wh unit gives about 1,532 Wh at our 75 percent usable share3. Lab tests of a same-size unit found more (1,710 Wh)9.
  • A gas furnace is usually hardwired. Running it from a battery takes a transfer switch or a furnace inlet installed by a licensed electrician.

The arithmetic

Hours = usable watt-hours / blower watts. Take the station's stated capacity, keep 75 percent of it for losses in the inverter, and divide by what the blower draws. For a 2,042.8 Wh Jackery Explorer 2000 Plus that is 2,042.8 x 0.75 = 1,532 Wh, and 1,532 / 350 = 4.4 hours of nonstop blower time13.

A furnace does not run nonstop. The blower comes on when the burner heats the exchanger and stops when the thermostat is satisfied. Otter Tail Power lists 160 to 415 hours a month for an intermittent furnace fan1. Out of 720 hours, that is 22 to 58 percent. On a cold night near the high end, the average draw is about 200 W (350 x 0.58), so the same 1,532 Wh lasts about 7.6 hours. On a mild night near the low end (about 78 W), it lasts about 20 hours.

Use your own furnace's number if you can. The furnace's nameplate lists the blower motor's amps; amps x 120 V gives an upper limit on its watts. The inducer fan, igniter and control board also draw power while the burner runs, and the utility figure covers the fan motor only, so leave margin.

Why 75 percent. It is the highest usable share the makers' own runtime examples support. OutdoorGearLab measured 1,710 Wh of usable AC output from a 2,042 Wh Jackery Explorer 2000 v2, about 84 percent, so our figure leans conservative9.

Estimated hours for a 350 W furnace blower

Our arithmetic: stated Wh x 0.75 / average watts. 58 and 22 percent are the high and low ends of Otter Tail Power's monthly hours.

Power stationStated capacityRunning nonstopOn 58% (cold night)On 22% (mild night)
Lion Summit6665 Wh1.42.56.4
Jackery HomePower 1000 Plus v241,024 Wh2.23.89.9
Lion Safari51,612 Wh3.56.015.5
Anker SOLIX S200072,010 Wh4.37.519.4
Jackery Explorer 2000 Plus32,042.8 Wh4.47.619.7
EcoFlow DELTA 3 Max82,048 Wh4.47.619.7
Explorer 2000 Plus + one Battery Pack 2000 Plus104,085.6 Wh8.815.239.4
SourceMaker product pagesRead Oct 7, 2026Our arithmeticRead Oct 7, 2026Our arithmeticRead Oct 7, 2026Our arithmeticRead Oct 7, 2026

Hours. The 350 W blower figure is from two utility charts12; your furnace may draw more or less. A Jackery Explorer 300 (300 W inverter) is too small for a 350 W blower.

Output and the start-up kick

A blower motor draws extra power for a moment when it starts. Every unit in the table except the Lion Summit lists a surge rating far above a 350 W running load: 3,600 W on the HomePower 1000 Plus v2, 3,000 W peak on the Anker SOLIX S2000, 4,800 W on the EcoFlow DELTA 3 Max, and 6,000 W on both the Explorer 2000 Plus and the Lion Safari34578.

The Lion Summit lists 530 W of AC output and we did not find a surge figure on its page6. It may run a small blower, but check the furnace's start draw before you count on it.

Recharge matters as much as size. A cold snap can outlast any battery. Jackery lists a 2-hour AC recharge for the Explorer 2000 Plus and 50 minutes for the HomePower 1000 Plus v2; Lion lists about 2.3 hours for the Safari345. If the grid comes back for a few hours, or a generator runs outdoors for a while, a fast recharge buys another night.

Getting the furnace onto the battery

Most gas furnaces are wired straight into a circuit, with no plug. To run one from a power station, an electrician installs a transfer switch or a dedicated inlet so the furnace circuit can be fed from the station safely. Jackery's Explorer 2000 Plus page offers a transfer switch, valued there at $399.99, for whole-home backup3. We do not give wiring steps: this is a job for a licensed electrician, and many areas require a permit.

What a 120 V station will not do. No single 120 V portable power station runs central air, a ducted heat pump or a 240 V well pump. Jackery says two Explorer 2000 Plus units in parallel give 120/240 V3; whether that starts a particular 240 V motor is a question for the electrician. For a long outage with heavy loads, a fuel generator running outdoors is often the right tool. See power station or generator.

Using a space heater instead? It draws about four times what a blower does. See electric blanket vs space heater.

Units with the surge for a blower

Each maker's own page has the current price and the full spec sheet.

Good for high output with a TT-30 RV outlet

Lion Safari

Output
3,000 W, 6,000 W surge
Capacity
1,612 Wh, to 4,300 Wh with a pack
Listed price
$1,399.00
Checked
Oct 7, 2026
See prices on Lion Energy

Good for $338 per kWh in our October 2 table, the least we read

Anker SOLIX S2000

Output
1,500 W, 3,000 W peak
Listed price
$679.99
Checked
Oct 7, 2026
See prices on Anker SOLIXOpens Anker SOLIX's site. Not a referral link.

Furnace questions

Can a power station run my gas furnace?

It can run the blower and controls of a gas furnace if its output covers the blower's start and running draw, and if an electrician connects the furnace through a transfer switch or inlet. The gas does the heating. How long it lasts depends on capacity and how often the blower runs: see the table above.

How many watts does a furnace blower use?

Otter Tail Power and Utilities Kingston both list a furnace fan motor at about 350 W12. Your furnace's nameplate amps x 120 V gives the upper limit for your own unit.

How long will a 1,000 Wh battery run a furnace?

About 2.2 hours of nonstop blower time at 350 W, or about 3.8 hours on a cold night when the blower runs 58 percent of the time (1,024 x 0.75 / 350, our arithmetic).

Will it run central air or a heat pump?

No. No single 120 V portable power station runs central air, a ducted heat pump or a 240 V well pump. Two paralleled Explorer 2000 Plus units give 240 V per Jackery3; ask an electrician whether that covers your equipment.

How do I make the battery last longer?

Set the thermostat a few degrees lower so the blower runs less, close off rooms you are not using, and recharge whenever the grid or a generator gives you a window.

Sources

  1. Appliance energy use chartsOtter Tail Power Company, read Oct 7, 2026
  2. Electricity use and appliancesUtilities Kingston, read Oct 7, 2026
  3. Explorer 2000 Plus Portable Power StationJackery, read Oct 7, 2026
  4. HomePower 1000 Plus v2Jackery, read Oct 7, 2026
  5. Lion SafariLion Energy, read Oct 7, 2026
  6. Lion SummitLion Energy, read Oct 5, 2026
  7. SOLIX S2000 Portable Power StationAnker SOLIX, read Oct 2, 2026
  8. DELTA 3 Max Portable Power Station (2048Wh)EcoFlow, read Oct 2, 2026
  9. Power station lab measurements (updated July 23, 2026)OutdoorGearLab, read Oct 7, 2026
  10. Battery Pack 2000 PlusJackery, read Oct 7, 2026

About this page

We may be paid when you buy through links on this page.

We may be paid when you buy through links on this page.

Prices and specifications are each maker's own, as listed on the date shown, and change often during sales. The maker's page is the final word on price, availability and terms.

Runtime figures are estimates from stated capacity, not measurements. OutageReady Guide does not sell power stations and has not tested any product.