Winter Storm Power Outage Guide: Heat, CO Safety and Battery Needs

The short answer: in a winter-storm outage, use a portable power station for the essentials (phones, a router, lights, medical equipment such as a CPAP) and treat heat as a short-burst extra. The essentials add up to roughly 700-1,000Wh a day by our estimate, so a 1,000-2,000Wh station covers a day or two, while a 1,500W space heater empties a 2,000Wh station in about 1.3 hours. Never run a generator or a fuel-burning heater indoors. We did not test these setups; the figures are our calculations from published specifications, and the safety guidance comes from Ready.gov and the CDC.

What a Winter Outage Takes Away

Ready.gov says winter storms can "cut off heat, power and communication services," and recommends gathering supplies to stay home for several days. Cold also affects the power station itself, which we cover below. The question is what to keep running and what to give up.

Priority Loads, From Most to Least Important

1. Medical equipment. CPAP machines, oxygen concentrators and anything that cannot safely pause. See our medical equipment power guide.
2. Communication. Phones, a router and a battery radio for alerts.
3. Light. LED lights draw very little.
4. Heat in one small room. Possible only for short bursts on a battery.
5. A sump pump, if your basement floods. See our sump pump guide.

How Much Battery Do the Essentials Need?

Energy is watts times hours. These are illustrative assumptions, so replace them with the labels on your own devices:

Add a margin of about 25% and divide by the share of the rated capacity you can actually use. In OutdoorGearLab's results table for 14 stations, measured usable capacity ranged from 75% to 93% of the claimed figure. A 1,000Wh-class station such as the Jackery Explorer 1000 v2 (910Wh measured usable) covers about one day of essentials. A 2,000Wh-class unit such as the Bluetti Elite 200 V2 (1,910Wh usable) covers about two. Our runtime calculator does the math for your list.

What a Space Heater Really Costs in Battery

Runtime is usable watt-hours divided by the heater's watts.

These are our calculations and ignore conversion losses, so real runtimes are a little shorter. Check that the station's continuous output is at least the heater's watts: the Jackery 1000 v2 is rated 1,500W and sits right at the limit of a 1,500W heater. For the full math, see our space heater guide. The practical plan is to warm one small room in short bursts and rely on layers, blankets and a closed-off room for the rest, because a battery cannot heat for a whole night.

Carbon Monoxide: The Real Danger of Winter Backup Heat

Power stations produce no exhaust, which is one reason they suit indoor use, but people often turn to generators and fuel heaters during outages. The CDC says to never use a generator inside your home or garage, even with doors and windows open, and to use it only outside, more than 20 feet from windows, doors and vents. Ready.gov gives the same distance and warns never to heat your home with a gas stovetop or oven. Both recommend carbon monoxide detectors with battery backup, near sleeping areas and on every level. You can read the details on Ready.gov and the CDC. Our indoor safety guide covers the station itself.

Cold Also Affects Your Power Station

Battery capacity and performance fall in the cold. Our cold-weather battery guide has the details. Keep the station in a warm room rather than an unheated garage, and charge it fully before the storm.

Solar Is Unreliable in a Winter Storm

Clouds and snow cover cut panel output exactly when you need it. A short winter day may give only 2 to 3 peak sun hours, so plan around stored capacity and treat solar as a bonus. Our solar sizing guide shows how to size panels for your weakest season.

Pre-Storm Checklist: The 48 Hours Before

• Charge the power station and every battery pack to full.
• Bring the station indoors so it starts at room temperature.
• Charge phones and laptops and download offline maps and alerts.
• List your priority loads and the watts of each, so you decide before the storm and not during it.
• Install or test CO detectors with fresh batteries.
• Fill any propane or fuel you rely on and store it safely outdoors.
• Gather blankets, warm clothes, water and non-perishable food.

What the 2021 Texas Storm Showed

The February 2021 storm left millions in the US midcontinent without power, sometimes for days. A joint report by NERC and FERC attributed 44% of unplanned generation outages to frozen equipment and 33% to fuel problems, as summarized in news coverage of the report. The lesson applies beyond Texas: regions that rarely see severe cold are often the least prepared when it arrives.

Frequently Asked Questions

Can a power station run a space heater?

Yes, but only briefly. A 1,500W heater empties a 2,000Wh station in about 1.3 hours and needs a station with at least 1,500W of continuous output. A low setting of about 750W doubles the runtime.

How much battery do I need for a winter outage?

For essentials only (CPAP, router, phones and lights), roughly 750-1,000Wh a day, so a 1,000-2,000Wh station covers one to two days. Add capacity for any heat, medical equipment beyond a CPAP or a sump pump.

Is it safe to use a power station indoors during a storm?

A power station has no exhaust, so it does not make carbon monoxide like a generator, but keep it dry, ventilated and away from heat sources. Never run a generator indoors or in an attached garage.

Does cold weather affect a power station?

Yes. Capacity and charging performance drop in cold temperatures, so keep the station indoors and charge it fully before the storm.