Best Power Station for a Refrigerator: Hours of Cold per Charge

Our power station sizer assumes a 150 W fridge at a 35 percent duty cycle. That is 52.5 W averaged over a day, or about 1,260 Wh per 24 hours. With 15 percent lost in the inverter, a 1,024 Wh unit delivers about 870 Wh and runs the fridge about 16 hours. A 2,048 Wh unit gives about 33 hours and a 3,014 Wh unit about 49 hours. The 4,096 Wh EcoFlow DELTA Pro 3 reaches about 66 hours, but by then you are paying for 240V output you may not need.

Newer ENERGY STAR refrigerators often average under 40 W, which stretches every figure above by 25 percent or more. Older side-by-sides with ice makers can average 80 W and cut them by a third. For a real number, plug your fridge into a watt-meter for a day before you buy. Otherwise the sizer's defaults are a safe middle.

A fridge that stays closed holds temperature for several hours without power. There is no rush to plug it into the battery the moment the lights go out. Do it when you notice, and the hours above start from that point.

A compressor is an induction motor, and it needs a burst of current to start. Our appliance table puts a full-size fridge at 1,200 W starting and a chest freezer at 900 W. Every unit in this guide has a 3,000 W surge or better, so the fridge alone will always start. The question is what else is plugged in when the compressor kicks on. If two motors start at once, a fridge, freezer and 600 W furnace blower together can momentarily ask for about 2,400 W. That is why we treat 3,000 W as the floor and prefer 4,000 W.

Continuous wattage matters less than people think. A fridge at 150 W plus a freezer at 100 W plus lights, router and phone chargers stays under 500 W steady. The continuous rating bites in the kitchen. Run a microwave or coffee maker on top of the fridge and you are at 1,500 W, which puts the 1,500 W Jackery Explorer 1000 v2 at its limit while the 1,800 W to 2,600 W units have headroom.

The 1 kWh class is the cheapest and buys roughly 16 hours of fridge. Step up to the 2 kWh class and you get a full day plus a margin, and most of those accept expansion batteries. The 3 kWh Elite 300 at $1,199 is the only unit that reaches two days in one box under $1,500. Choose the class by how long your outages usually last, then choose the unit by weight and solar input.

A fridge uses about 1,260 Wh a day. Panels rarely deliver their nameplate, so plan on 70 percent of rating for about four peak-sun hours. At that rate 400 W of panels puts back roughly 1,100 Wh on a decent day and 600 W puts back about 1,700 Wh. In good weather, 400 W keeps a fridge going indefinitely with the battery covering the night. Going to 600 W adds the freezer and lights.

What limits this is the unit's solar input. The Jackery Explorer 1000 v2 and 2000 v2 cap at 400 W. The BLUETTI Elite 100 V2, Elite 200 V2 and EcoFlow DELTA 2 Max accept 1,000 W, the DELTA 3 Plus accepts 1,000 W across two inputs, and the Jackery Explorer 2000 Plus accepts 1,400 W. Planning to run on sun for more than a day? Shop for input wattage as hard as you shop for capacity.

A chest freezer is easier than a fridge. It runs at about 100 W with a 900 W start and a 30 percent duty cycle, which averages about 30 W and 720 Wh a day. A full chest freezer that stays shut can go 48 hours without power, so it is also the load you can rotate. Run the fridge for a few hours, then move the plug to the freezer for an hour. Together the two average about 82 W, which gives a 1,024 Wh unit about 10 hours and a 2,048 Wh unit about 21 hours.

If the power station is not next to the appliance, use a 12-gauge outdoor extension cord and keep the run under 50 ft so the compressor sees full voltage at start. Thin 16-gauge cords are the most common reason a fridge trips a power station's overload protection.

Once your outages routinely last three days or more, a power station stops making sense around the 3 kWh mark. A Westinghouse iGen2550DFc dual fuel inverter generator costs $500 to $1,000 and runs about 11 hours at quarter load on 1.1 gallons of gasoline. It will keep the fridge, freezer, furnace blower and lights going for as long as you have fuel. You give up silence and indoor use in exchange for unlimited runtime. The dual fuel inverter guide covers the quiet options.

To cover the fridge, furnace and well pump automatically with no fuel at all, step up to a 240V home battery. The Anker SOLIX F3800 Plus at about $2,400 has 3,840 Wh, 6,000 W and real 240V output, and it takes up to six expansion batteries. It is heavy and costs far more than the Elite 300. It is also where a battery starts to replace a generator instead of backing one up. The home battery guide compares the no-install options.