The short answer: yes, a solar generator works in a winter power outage, as long as you keep it indoors. The Jackery HomePower 3000 holds 3,072Wh and puts out 3,600W. That runs a fridge, router, lights and phones for about a day and a half, or the same list plus a gas furnace’s blower for about half a day.
The two things that change in winter are not what most people expect. The battery is fine in the cold if you keep it warm. The part that gets weak is the sun: panels return far less energy on a short, grey winter day. This guide shows what that means in hours, so you can decide whether one unit is enough for the storms where you live.
Where cold weather actually matters
There are three separate questions, and they have different answers.
- Delivering power in the cold. Lithium iron phosphate (LiFePO4) batteries, the type in the Jackery units, deliver power in cold rooms without trouble. A very cold battery loses some usable capacity, so you get a little less than the number on the box.
- Charging in the cold. This is the real limit. Most lithium batteries restrict or refuse charging when the battery itself is below freezing, to protect it. That affects charging from the wall and from panels. Look up the charging temperature range on Jackery’s specification page for the exact unit you are buying, because it differs by model.
- Solar input in the cold. Panels themselves like cold air and actually work a little more efficiently when they are cold. The problem is the light: short days, a low sun, snow cover and cloud.
The simple rule that covers the first two: keep the unit inside the heated part of the house. A closet, hallway or utility room is fine. An unheated garage in a hard freeze is not.
A day of winter essentials
Winter loads are heavier than summer ones because of the furnace. These are typical figures, so check the labels on your own equipment.
| Load | Typical draw | Energy per day |
|---|---|---|
| Refrigerator or fridge-freezer | about 150W running | 1,000 to 1,500Wh |
| Wi-Fi router and modem | 10 to 15W | about 300Wh |
| LED lights (a few rooms, long dark evenings) | about 50W | 300 to 500Wh |
| Phones, tablets, a laptop | 20 to 60W | 150 to 300Wh |
| Gas or oil furnace blower and ignition | 400 to 600W running | 3,000 to 5,000Wh in deep cold |
The first four add up to roughly 2,000Wh a day. The furnace blower more than doubles that. It is the single biggest decision in a winter outage, and our furnace guide covers what it can and cannot run.
How long it lasts
These figures count the battery alone, with no solar, and use 2,000Wh a day for the essentials and 5,500Wh a day with a furnace blower. They ignore conversion losses, so real runtimes will be roughly 10 to 15 percent shorter.
| Setup | HomePower 3000 (3,072Wh) | HomePower 3600 Plus (3,584Wh) | 5000 Plus (5,040Wh) |
|---|---|---|---|
| Essentials only (about 2,000Wh a day) | about 1.5 days | about 1.8 days | about 2.5 days |
| Essentials plus furnace blower (about 5,500Wh a day) | about 13 hours | about 16 hours | about 22 hours |
If your furnace is gas or oil and you have a warm layer of clothing and blankets, you can also run the blower only part of the day, and a house that is closed up and insulated holds heat for hours. That stretches the second row considerably.
Check the current price of the HomePower 3000 at Jackery (panels included)
What winter sun gives back
Be realistic here, because this is where winter buying decisions go wrong.
On a clear day in the northern half of the country, a set of panels may return somewhere in the region of a third to a half of what the same panels would give in summer. For a modest panel set, that is on the order of 600 to 1,200Wh over the day, depending on how far north you are, how steeply the panels are tilted and whether they are in shade by mid-afternoon.
Under heavy overcast or falling snow, output drops to a small fraction of that, often not worth setting up. And if the panels are buried in snow, they produce nothing.
Put that against the table above. On a clear winter day, panels can win back about half of a day of essentials and make a two-day outage a three-day one. They cannot carry a furnace blower. And a storm that causes the outage is usually the same storm that blocks the sun, so the battery has to carry the first days on its own. Our guide to how many panels charge a HomePower 3000 shows the charge-time sum for any panel size.
Setting up panels in winter
A few habits make a real difference when the sun is low.
- Face them south and tilt them steeply. A steep angle catches the low sun and lets snow slide off.
- Keep them out of shade. In winter the shadow of a tree or the next house is much longer than you remember from summer.
- Clear snow gently. Use a soft broom or brush. Never chip ice with a hard tool.
- Keep cables off the ground. Connectors left in slush or snow can freeze or fill with water. Our guide to cables and connectors covers what to check.
- Bring the charge indoors. Run the panel cable through a door or window gap to the unit inside, so the battery stays warm while it charges.
Safe use in a winter outage
Cold weather brings its own risks, and some of the worst ones come from the equipment people use to keep warm.
- Never run a gas generator, grill or camp stove indoors. Carbon monoxide kills people in almost every major winter outage. A battery unit makes no exhaust, which is its main safety advantage. Our comparison with gas generators goes through it.
- Do not use the unit to run a large electric heater for hours. A 1,500W space heater empties a HomePower 3000 in about two hours. Our space heater guide shows the runtimes, and a blanket or heated pad uses a tiny fraction of that.
- Protect against frozen pipes with the loads you can run. Some people run a small circulating pump or keep the furnace blower going in short bursts, rather than heat the whole house.
- Plan for medical needs first. If someone relies on a CPAP or an oxygen concentrator, size the unit around that load before anything else. Our CPAP guide and oxygen concentrator guide cover it.
Charge it before the storm, and keep it charged
A winter outage usually comes with warning. A battery sitting at 100 percent when the storm arrives lasts the full figures in the table above. A battery at 40 percent does not.
Keep the unit topped up through the cold months. Charge it from the wall in a warm room, not from the outdoor panels on a freezing morning. When a winter storm warning appears, check that it is full and that the cables and panels are somewhere you can reach them without digging.
Which unit to buy
For most households in cold-winter states, the HomePower 3000 is the sensible start. It covers the essentials for a day and a half, handles a furnace blower for part of a day, and includes panels. It suits a short outage of one to two days.
Step up to the 3600 Plus or the 5000 Plus if outages in your area routinely last several days, if you want the furnace blower running through the nights, or if you rely on medical equipment. The home backup buying guide compares every unit on the same list, and our three-day outage guide shows what a longer event demands.
Jackery's full lineup and current prices
Keep reading: Best solar generators for home backup · How to size a solar generator for home backup · Can a solar generator run a furnace? · Best solar generators for home backup in Alaska