Scenario
What size power station runs a furnace fan, fridge and Wi-Fi through a 12-hour winter storm night?
Our best fit is the EcoFlow DELTA Pro 3, at about 13 h calculated. The plan needs 3,110 Wh at the outlet over 12 hours and about 1,600 W at start-up, from maker specs and cited appliance figures checked .
Yes. EcoFlow DELTA Pro 3 runs a furnace fan, fridge and Wi-Fi through a 12-hour winter storm night for about 13 h. calculated from maker specs, .
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Goal: 12 h. Hours use maker inverter efficiency where published, otherwise the 0.85 estimate, and leave out idle draw the maker doesn't publish. Stations shown out of stock or with availability not shown are skipped. How we pick.
Open this plan in the calculator to change hours, watts, solar or temperature.
Devices and assumptions
| Device | Qty | Hours a day | Running | Starting | Source |
|---|---|---|---|---|---|
| Furnace blower fan (1/2 HP) | 1 | 8 | 550 W | 1,200 W | Champion wattage chart |
| Refrigerator (full-size) | 1 | On the whole time | 275 W | 1,000 W | ENERGY STAR data + Champion chart · cycles about 19% of the time calculated |
| Internet router/modem | 1 | On the whole time | 15 W | No extra | Champion wattage chart |
| LED light bulb | 3 | 6 | 11.5 W | No extra | Champion wattage chart |
Together: 875 W running, about 1,600 W while the largest motor starts, and 6,219 Wh a day. Over the 12-hour goal that is 3,110 Wh at the outlet calculated.
- A gas furnace still needs power for its blower; the fan runs a third of the day, an editable assumption.
- Furnace fan watts are Champion chart midpoints for a 1/2 HP blower.
- The station stays indoors, inside the maker's temperature range.
Stations that fit, cheapest first
| Station | Hours calculated | Starting headroom | List price |
|---|---|---|---|
| Anker SOLIX F3800 Plus | 13 h | 73% | $2,599.99 |
| EcoFlow DELTA Pro 3 | 13 h | 80% | $2,799 |
| Goal Zero Yeti PRO 4000 | 13 h | 78% | $3,999.95 |
3 of 43 stations in our data fit, counting out-of-stock and unpriced ones; this table shows the cheapest in-stock ones.
What would change this answer
- Your own device watts: the label on the device beats any typical figure. Enter it in the calculator.
- Inverter idle draw: most makers don't publish it, so hours here leave it out. Small loads feel this most.
- Cold: below a maker's temperature range a station may stop discharging or charging.
Our take
A gas furnace can keep a house warm in an outage only if something powers its blower and controls. Connecting a furnace to a power station usually needs an electrician-installed inlet or transfer switch, so plan that before the storm.
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