Winter Outage Backup: How to Size a Power Station for Your Home (and What It'll Actually Run)

Ice storms, nor'easters, and grid failures don't send invitations. Every October, the same questions flood homesteading and preparedness forums: "How big a battery do I need to keep the fridge cold and the lights on when the power goes out?" And right behind it: "Can I just run everything off one of those portable power stations?"

Short answers: yes, you can size it — and no, one box won't run your whole house like nothing happened. Here's the honest math so you buy once, not twice.

The two numbers that matter: watts and watt-hours

A power station's spec sheet gives you two headline numbers, and they answer two different questions:

• Watts (W) = how much power it can deliver at once. This is the speedometer. Your fridge needs ~150W running, a phone charger needs 15W, an induction cooktop pulls ~1,800W. If the total of everything running at the same time exceeds the station's wattage rating, it shuts off — or refuses to start that load at all.
• Watt-hours (Wh) = how much energy it stores. This is the gas tank. A 1,024Wh station can theoretically run a 100W load for about 10 hours — in practice a bit less, because inverters waste ~10–15% converting DC to AC.

Rule of thumb: size your watts to your biggest simultaneous load, and size your watt-hours to how long the outage might last. Most people get this backwards — they buy for watts and run out of tank on night one.

Start with your essentials list (not your whole house)

The most common mistake in every winter-outage thread is designing for "everything, like the grid never left." That pushes you toward a $8,000+ whole-home setup fast. Start smaller. For a winter outage, most families really need:

• Refrigerator + freezer: ~150–250W running, ~1.2–1.8 kWh per day
• LED lights for main rooms: ~30–60W
• Phones, tablets, router/hotspot: ~30–60W
• A few small extras (CPAP machine, well-pump controller, furnace blower fan): ~50–200W

That essentials bundle typically draws 250–500W at a time and burns through 2–4 kWh per day. Write your own list, check each device's label or manual for its watts, and add 20% headroom. That list is your sizing worksheet — everything flows from it.

What a portable power station can and can't do

Be straight with yourself here, because marketing isn't:

• Yes: fridge and freezer for a day or more, lights, phones, internet, laptops, CPAP, TVs, small fans, LED work lights. This is the sweet spot.
• Maybe: a microwave (1,000W+) for short bursts, a coffee maker, a small space heater on low — but these drain a battery shockingly fast. Five minutes of microwave is fine; heating a room all evening is not.
• No: electric stoves, induction cooktops (~1,800W each), whole-house electric heat, central AC, electric water heaters. These are grid-scale loads. In a winter outage, cook on gas/camp stove and heat with wood or a fireplace if you have one. Size the battery around the steady, critical loads, not the fantasy of business as usual.

This is the advice that keeps showing up in real preparedness threads, and it's the right one: one fuel source for cooking, a battery for everything else.

The winter caveat: solar recharges slowly in bad weather

Here's the part solar-battery bundles don't advertise: a "solar generator" is just a battery plus panels. In a sunny October week, 400W of panels might refill a 1,000Wh station in 3–4 hours. Under the gray, sleeting sky of an actual winter storm? Expect a small fraction of that — or nothing.

So size the battery for the outage, and treat solar as a bonus. If you want 2 days of essentials (say 5–6 kWh), buy that much battery first. Panels extend your runway when the sun shows up; they are not the plan. If your area gets real winter weather, consider a small inverter generator as the third leg for multi-day outages — battery for the quiet nights, generator to recharge the battery by day.

Do the math in 60 seconds

1. List your essentials and their watts. Total them. That's your minimum wattage rating (add 20%).

2. Multiply your simultaneous watts by the hours you want to run. That's your minimum watt-hours.

3. Divide by 0.85 to account for inverter losses.

4. If storms in your area last 2–3 days, multiply by the number of days — or plan a recharging method (solar, generator, your car).

Example: fridge (150W) + lights (50W) + phones/router (50W) + furnace blower (100W) = 350W running, ~4.2 kWh for 12 hours. Divided by 0.85 ≈ 5 kWh of battery for a 12-hour stretch, or roughly five 1,000Wh-class stations — or one 1,000Wh station recharged daily. That last sentence is why recharging strategy matters as much as capacity.

What the runtimes actually look like

Real numbers for a 1,000Wh-class LiFePO4 station (the most common "one big box" size):

• Fridge alone (~150W): ~5.5 hours
• Fridge + LED lights + phones (~250W): ~3.5 hours
• Lights, phones, router only (~80W): ~11 hours
• Space heater on low (750W): ~70 minutes — this is why you don't heat with batteries

And on a 100Wh power bank scale, you're looking at phones and a lamp for an evening — fine for a short blackout, not a winter storm.

Which size is right for you?

• Under 500Wh: short blackouts, camping, keeping phones and a light alive. Affordable, portable, limited.
• ~1,000Wh (1kW-class): the winter-outage workhorse. Runs a fridge plus basics for most of a day. Our 1000W / 1024Wh LiFePO4 station and 1200W / 1008Wh station both sit in this class — enough to keep the essentials going through the night, LiFePO4 cells for thousands of cycles.
• 2,000Wh+: multi-day resilience, or running heavier loads (well pump, sump pump, power tools). Pairs well with a few hundred watts of solar for daytime top-ups.

LiFePO4 vs. older lithium: if the listing says LiFePO4 (lithium iron phosphate), that's the better battery chemistry for home backup — far more charge cycles and more stable in temperature swings than standard lithium-ion. It's the spec worth paying for.

A note on buying

Whatever you buy, buy it before the storm forecast. Shipping a 27-pound battery takes time — ours ship free with delivery in about 1–2 weeks, and demand spikes the moment a named storm appears on the map. October is the month to get this done, not January.

And one last honest point: a power station doesn't replace a plan. Keep flashlights, blankets, a manual can opener, and a way to cook without electricity. The battery covers the machines; you cover the rest.

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Winter is coming whether the forecast mentions it or not. Size for your essentials, buy the battery before you need it, and keep the cooking off the battery. Browse our portable power stations — free US shipping, code WELCOME10 saves 10%. This is general guidance, not electrical advice — when in doubt, check with a licensed electrician.