Electric Blankets and Heated Pads on a Power Station: Real Run Times

A 1,000Wh power station will run a 12V car-style heated blanket (about 45–55 watts) for roughly 17–20 hours. It will run a household queen electric blanket for about 4 hours on high (around 200 watts) and 12–17 hours on low (about 50 watts). For a full night with power left over, use a 12V blanket or keep a 120V blanket on low.

The rest of this post walks through the math so you can work it out for your own station and your own blanket.

01The one formula you need

Run time (hours) = battery watt-hours × efficiency ÷ watts the blanket draws

Efficiency is the part people skip. A power station turns its battery's DC into 120V AC through an inverter, and that costs you. Runtime calculators commonly use 85% for anything plugged into the AC outlets and about 95% for the 12V car port, because the 12V port skips the inverter.

So a station labeled 1,000Wh really gives you about:

• 850Wh through the AC outlets
• 950Wh through the 12V port

Divide those by the blanket's watts and you have your hours.

02What blankets and pads actually draw

Check the tag or the controller first, since that's your blanket's real number. If you don't have it handy, these are typical ranges from power-station makers' guides:

• 12V car/travel blanket: about 35–75W. Common models list 42W, 45W, 48W (4 amps) and 55W (4.6 amps).
• Twin household electric blanket: about 100–150W at max.
• Full or queen household blanket: about 150–250W at max. Low settings can be around 50W.
• King, dual-control: up to about 300W on high.
• Heated mattress pads: similar to blankets of the same size. A one-sided pad can be around 100W, a two-sided queen around 200W.

The tag number is the maximum. Most blankets have a controller that cycles the heating wires on and off once the bed is warm, so the average draw over a night is lower than the tag, especially on low or medium.

03Run times, worked out

These use a 1,000Wh station. For a different size, scale the numbers: a 500Wh station gets about half, a 2,000Wh station about double.

Queen 120V blanket on high, 200W, running steady: 850 ÷ 200 = about 4.3 hours. That's not enough for a night.

Queen 120V blanket on low, 50W: 850 ÷ 50 = about 17 hours on paper. Add the inverter's own idle draw (below) and plan on 14 or so.

Mid setting, cycling: say a 150W blanket's controller has the wires on about half the time, for an average of about 75W. That works out to 850 ÷ 75 = about 11 hours. The half-on figure is only an example. Your blanket's duty cycle depends on the setting, the air temperature and how well your bag or quilt holds the heat.

12V blanket at 48W on the car port: 950 ÷ 48 = about 20 hours.

12V blanket at 48W on a small 300Wh station: 285 ÷ 48 = about 6 hours. That's fine if you only run it for the first half of the night.

If you also run a fridge or a CPAP off the same station, add their watts before you divide. Our posts on fridge run times and running a CPAP have those numbers.

0412V vs. 120V: why the 12V blanket usually wins

A 12V blanket comes out ahead on a power station for three reasons:

1. No inverter loss. That's roughly 10% more of your battery going into heat you can feel.
2. No inverter idle draw. With the AC side switched on, many 1kWh-class stations burn about 10–20W doing nothing. One brand's 1,000Wh model is reported at around 10–12W idle with AC on. Over a 10-hour night, 10W of idle is 100Wh gone, about two extra hours of a 12V blanket.
3. Lower draw to begin with. A 48W 12V blanket on all night uses less than a queen household blanket on medium.

The tradeoffs: 12V blankets are mostly throw-size (roughly lap-blanket to single-sleeper), with fewer settings and less heat. A queen 120V blanket covers two people and gets hotter.

Check the 12V port's limit. Many stations rate the car port at 12V/10A, which is 120W. A 4–5 amp blanket is well under that. If you plug in a splitter and run a 12V fridge from the same port, add the amps together.

05How to get a full night out of a 120V blanket

If the household blanket is what you own, here's how to stretch it:

• Preheat, then turn it down. Run it on high for about 15 minutes before you get in, then drop to low. That's a common tip from power-station makers, and it keeps you out of the 200W range for most of the night.
• Turn off the AC side when it's not in use. Idle draw adds up overnight when nothing is plugged in.
• Insulate under you. Heat you lose into the ground is heat the blanket has to replace. A pad with a decent R-value under you makes the controller cycle less. See sleeping pad R-values explained.
• Put the blanket inside your layers. An electric blanket on top of a sleeping bag mostly heats the tent air. Put it under a quilt or over you inside the bag's zip (if the manual allows), or use a heated mattress pad on top of your sleeping pad with your bag over it.
• Use the auto-off timer if it has one. Many household blankets and pads shut off after a set number of hours. Some Sunbeam queen pads list a selectable shut-off up to 12 hours. That stops a forgotten blanket from draining the station the next day.

06Measure it instead of guessing

Most power stations show watts out on the display. Plug the blanket in, set it where you'd sleep, and watch the number for 10–15 minutes. On a cycling blanket you'll see it jump between the full draw and almost nothing.

The better test is a full night at home. Charge the station to 100%, sleep on the blanket, and read the percentage in the morning. If it dropped from 100% to 55% on a 1,000Wh unit, your night used about 450Wh at the wall-side meter. That real number beats any chart, including this one.

07Safety notes that matter at camp

• Follow the manual about bunching and folding. Most tell you not to run the blanket wadded up or tucked under a mattress, because trapped heat is how hot spots start.
• Keep the controller and plug dry. Tent condensation runs down the walls and collects on the floor, so keep connections off the floor and away from the tent wall. Here's why tents get wet inside.
• Don't run a 12V blanket all night off your vehicle's starting battery. That's what the power station is for.
• A heated blanket is one of the safest ways to use electric heat at camp because it heats you instead of the air. For why a space heater on a power station is a different story, see tent heaters: what's safe.

08Recharging for night two

A 450Wh night needs 450Wh back in the morning. On short fall days, a 200W panel won't come close to its rating. Our post on solar output on a short fall day shows how to plan for that. If you're on a hookup site, plug the station into the pedestal and you're done.

09Before your next cold trip

• Find the watts on your blanket's tag or controller.
• Divide your station's Wh × 0.85 (AC) or × 0.95 (12V port) by those watts.
• If the answer is under 10 hours, switch to low after preheating or go 12V.
• Turn off the AC side when it's not powering anything.
• Do one test night at home and write down the percentage used.

For the rest of the cold-night setup, see staying warm below 40 and our power station basics.

Related: Fall Foliage Camping: Planning a Trip Around Peak Color

Sources (6)

• Oupes: How many watts your electric blanket really uses
• Bluetti: Electric blanket power consumption guide
• Ozk Customs: 12V heated blanket guide for vans and camping
• Powyr: How to calculate how long a power station will last
• Portable Energy Lab: Inverter idle consumption explained
• B&H: Jackery Explorer 1000 v2 specs