Can a Portable Power Station Run a Space Heater?

How many watts a space heater uses

A Virginia Cooperative Extension list puts portable heaters at 750 to 1,500 W ¹. At the top of that range, that is a lot of power for a battery: every hour on high uses 1.5 kWh.

The heater’s thermostat cuts in and out once the room is warm, so the real use can be lower. In a cold house during an outage, expect it to run most of the time.

How long a power station can run it

The station’s continuous AC output must be above the heater’s watts. All five stations below can run a 1,500 W heater; the question is for how long.

How we got these: capacity × 85 % usable ^3,4 ÷ (heater watts + what the station uses on its own: about 10 W published for the Elite 200 V2 ⁹, 20 W for the Apex 300 ¹⁰, 20 W assumed for the others). The heater runs nonstop in this table.

Some stations have a mode for heating devices above their rated output: EcoFlow says X-Boost is more suitable for heating devices, such as an electric blanket, a water heater or a heat pump ⁸, and BLUETTI’s Power Lifting mode is for pure resistive loads like heaters ⁹. These modes do not add energy: the battery still empties at the same rate.

Why a battery can’t heat a room for long

The arithmetic: a room heater needs about 1.5 kWh for each hour on high. Even the largest station in the table above holds about 3 kWh of usable energy. A 10-hour night on high takes about 15 kWh, the usable energy of about five of the largest station in the table, which weighs 77 lb each ¹¹. The battery-heated products we know of, such as heated clothing, warm a person, not a room.

Baseboard heaters: why a portable station won’t run them

• Voltage. Many baseboards run on 240 V: Ouellet sells its standard line in 240/208 V versions from 300 to 2,500 W, and in 120 V versions from 300 to 1,500 W ². The C1000 Gen 2, DELTA 3 Plus and Elite 200 V2 give 120 V only ^7,8,9; the HomePower 3600 Plus gives 240 V only with a second unit ¹¹, and the Apex 300 can switch to 240 V ¹⁰.
• Wiring. Baseboards are wired to the electrical panel, with no plug. Connecting them to any backup source is a job for a licensed electrician.
• Load. Each 1,000 W baseboard uses 1 kWh per hour of heating. A few rooms of baseboards would empty even the largest station in an hour or two.

What uses far less power and still keeps you warm

• An electric blanket: 60 W for a single, 100 W for a double ¹. On a 2,048 Wh station, a double blanket runs about 15 hours, against about one hour for a heater on high.
• One room, closed doors, warm layers: see how to heat your house during a power outage for heat sources that need no electricity and the safety rules.
• Keep your furnace running instead: a standard gas furnace blower needs about 500 W, a third of a heater; see can a power station run a gas furnace.

To size a battery for your own list, use the power station calculator. Our method is on the how we research page.