Quick answer: A 2000Wh power station holds a refrigerator, a chest freezer and a router for 19 hours, or those plus a CPAP and a furnace blower for 9 hours. The average American power cut in 2024 lasted about 7 hours, so that is the outage covered two or three times over — and the doubled capacity is the least interesting thing about it.
Doubling the battery doubles the runtime. Exactly, boringly: every figure in the 1,000 Wh table is multiplied by two and nothing else about it changes. If that were the whole story this article would be a paragraph. Two things do change, and neither of them is capacity: what the inverter will start, and whether the total covers the outage you are actually likely to get. For the wider decision, our power station sizing guide covers every tier.
What actually changes: the surge
At 1,000 Wh the class ships surge ratings of 3,000 to 3,600 W. At 2,000 Wh it ships 4,400 to 6,000 W — 2,042 Wh with 2,200 W continuous and 4,400 W surge at one end of the shelf, and 3,000 W continuous with a 6,000 W peak at the other. That matters because of one load.
No refrigerator maker publishes a starting figure for the finished appliance. The only published inrush numbers belong to the compressors, and they run 3,146 to 4,626 VA. Set the two side by side and the picture is not gradual, it is a threshold.
| Class | Surge rating | Against 3,146–4,626 VA |
|---|---|---|
| 1 kWh, smaller inverter | 3,000 W | does not reach even the bottom of the band |
| 1 kWh, larger inverter | 3,600 W | covers the lowest third |
| 2 kWh, smaller inverter | 4,400 W | covers 85 per cent of it |
| 2 kWh, larger inverter | 6,000 W | clears the whole band, 30 per cent to spare |
There is a neat symmetry in those numbers. At 1 kWh the smallest published compressor inrush sits 5 per cent above the smaller unit’s surge rating. At 2 kWh the largest published inrush sits 5 per cent above the smaller unit’s. The whole band fits between the two classes, which is why this is the tier where the refrigerator question closes rather than the tier where the runtime gets long.
Long enough for what?
Runtime tables usually stop at the number of hours. The useful question is whether those hours cover a real power cut, and the EIA publishes the answer. In its Electric Power Annual 2024, the average American customer went 11 hours without electricity across 1.5 interruptions — about seven and a third hours per outage. That is the bar to clear.
| What you keep running | Draw | Runtime | Average outage |
|---|---|---|---|
| Refrigerator, chest freezer and router | 83.8 W | 19 hours | covered 2.6× |
| Those, plus a CPAP with humidifier | 142.8 W | 11 hours | covered 1.5× |
| Those, plus a furnace blower on ECM low | 169.8 W | 9 hours | covered 1.3× |
| Those, plus a window air conditioner | 919.8 W | 1.7 hours | not covered |
Three of those four budgets cover the average outage with margin, and the fourth misses it by a factor of four. That is the shape of the decision at this tier: keeping food cold and people connected is comfortably solved; keeping a room cool is not solved at all.
Where the average stops helping
An average hides the outages people actually buy for. In the same EIA year, customers in South Carolina averaged nearly 53 hours without power, after Hurricane Helene; customers in Arizona, the Dakotas and Massachusetts averaged under two. A fridge-freezer-router budget covers the whole of a two-hour state ten times over, and about a third of everything South Carolina’s customers lost across the whole of 2024.
Nothing you can carry covers a hurricane. Past roughly a day, capacity stops being the question and recharging becomes the whole of it. If your outages are measured in days rather than hours, size for the recharge, not for the battery.
How we calculated this
Runtimes are 2,000 Wh × 0.8 ÷ the summed running watts. The 0.8 is our planning figure, taken from the runtimes one manufacturer publishes for its own product, which imply 57 to 86 per cent delivered depending on the load. A nominal 2,000 Wh is used rather than any one product’s capacity; the two Jackery units cited both hold 2,042 Wh.
The outage figures are the EIA’s own SAIDI and SAIFI for 2024, published 1 December 2025; seven and a third hours is 11 divided by 1.5, our arithmetic on their two numbers rather than a figure they print. Load figures come from this site’s verified articles — medians of ENERGY STAR certified records for the refrigerator and freezer, manufacturer data sheets for the CPAP and the blower. No product was tested by us and none is recommended. Our method is described at how we test.
One thing worth saying plainly: a refrigerator’s rating plate is not its average draw. Pages quoting “a 500 W fridge” and then promising twenty hours from 2,000 Wh are applying an undeclared duty cycle — their own arithmetic gives four. The certified average of 52.6 W already has the cycling in it.
Before you rely on this in an outage
A portable power station is a plug-in appliance. Do not wire one into your home’s circuits, and never feed a house through a wall socket — that is backfeeding and it can kill line workers. A transfer switch is electrician work.
If someone in the house depends on medical equipment, size it with the equipment supplier rather than from a table, and ask your network operator about its priority-restoration register.
Frequently asked questions
Is a 2000Wh power station twice as useful as a 1000Wh one?
It is exactly twice as long-lasting, which is not the same thing. The useful difference is the inverter that comes with it: the surge rating jumps from 3,000–3,600 W to 4,400–6,000 W, and that is what moves a refrigerator from “probably” to “yes”. If your loads already started on the smaller unit, you are buying hours and nothing else.
Will it run a refrigerator through a power cut?
Yes, and with a freezer and a router alongside it for about 19 hours — roughly two and a half times the average 2024 outage. At this tier the surge ratings also cover the published compressor inrush, which the 1,000 Wh class did not. For a single night rather than a whole outage, the overnight arithmetic is a shorter calculation. Check the figure on your own rating plate all the same; it is the one appliance nobody publishes a proper starting number for.
Can it run a window air conditioner?
It will start one — all 438 certified window units use a variable-speed compressor, so there is no violent inrush — but a 750 W air conditioner on top of the fridge, freezer, router and CPAP leaves you about an hour and three quarters. Cooling is the load this tier does not solve, and the reason is energy rather than power: it draws four times what everything else on that list draws put together.
How many appliances can I run at the same time?
Add the running watts and stay under the continuous rating — 2,200 to 3,000 W here, which is more than most households will ever put on it at once. For surge, add nothing except the single largest starting figure, because motors do not start in unison. The arithmetic that catches people out is the gap between starting and running, not the sum of the running watts.
The short version
Buy a 2000Wh power station for the inverter, not for the battery. The capacity buys you a second day of the same small loads; the surge rating buys you the one appliance the smaller class could not promise. Set against what the EIA says an American outage actually looks like, a fridge, a freezer and a router are covered two and a half times over, a CPAP and a furnace blower still fit, and a window air conditioner does not — at any capacity you can carry.
This article is general information, not an installation guide and not a substitute for a licensed electrician. Electrical work on a service panel, a transfer switch or a utility connection is regulated in most jurisdictions and normally requires a permit and an inspection. Fuel-burning equipment produces carbon monoxide and must never be run indoors, in a garage or near an opening into the home.
