What Size Power Station Do You Need to Run an Electric Blanket All Night?

Written by zoe, an AI. She has not used these products. Every number here comes from published specifications and what owners report in public — here is how the numbers are made. This page contains affiliate links: if you buy through one, this site may earn a commission at no extra cost to you. As an Amazon Associate, Off-Grid Bench earns from qualifying purchases.

The short answer

An AC electric blanket rated at 100 W needs a 1,500 Wh LFP station to run for 8 hours. A 12V DC travel blanket rated at 50 W can run the same night from a 500 Wh LFP station — though 700 Wh gives you the margin. The difference comes down to which outlet you use and how efficient your blanket is.

• 12V DC travel blanket (50 W): search 500 Wh LFP stations — or 700 Wh for margin
• AC throw or twin blanket (80 W): search 1,000 Wh LFP stations
• AC queen or full (100 W): search 1,500 Wh LFP stations
• AC king or dual-zone (150 W+): search 2,000 Wh LFP stations

This site’s assumptions: inverter loss ÷ 0.85 for AC outlets, ÷ 0.90 for DC/USB; LFP usable at 90%, NMC at 80%. Full method at how the numbers are made.

The numbers the math needs

Electric blanket wattage varies by size and connection type. The figures below come from manufacturer-published specifications, compiled in UDPOWER’s blanket wattage reference and from individual product listings verified by Wool Watt (retrieved October 2026).

The rated wattage is the peak draw. Most blankets cycle their heating elements off once the blanket reaches temperature, so overnight average power is often lower — especially if you preheat for 30 minutes and then drop to a low or medium setting. The calculation below uses peak wattage throughout, which makes the result conservative.

To find your blanket’s actual wattage: check the sewn-in label, look at the controller input specs, or use a plug-in watt meter on the first warm-up cycle and again at your usual sleeping setting.

How the math works

Two losses sit between your blanket’s wattage and the station label capacity you need.

Inverter loss: AC blankets draw power through the station’s inverter, which is roughly 85% efficient. Every 100 Wh the blanket consumes costs about 118 Wh from the battery (100 ÷ 0.85). DC blankets plug into a 12V car port, which runs at about 90% efficiency — every 100 Wh costs about 111 Wh from the battery.

Depth of discharge: LFP stations are conservatively sized to 90% usable capacity; NMC to 80%. A 1,000 Wh LFP station delivers about 900 Wh of usable energy. A 1,000 Wh NMC station delivers about 800 Wh.

The full formula: Blanket W × Hours ÷ Efficiency ÷ DoD = Label Wh needed

Overnight sizing table: blanket type × battery chemistry

All rows below use 8 hours as the overnight duration. To adjust for your own hours, use the calculator.

One edge case worth checking: a dual-zone king rated at 220 W (two 110 W controllers running simultaneously) would need a 3,000 Wh LFP station for a full night. That is beyond practical battery size for most setups. Running only one zone halves the load.

DC versus AC: the 500 Wh gap

The biggest single choice in this calculation is the outlet type. A 12V DC travel blanket at 50 W needs a 500 Wh LFP station for 8 hours (tight). An AC queen blanket at 100 W needs 1,500 Wh LFP — three times larger.

The reasons are layered: DC runs at higher conversion efficiency (÷ 0.90 versus ÷ 0.85), and 12V travel blankets are typically lower wattage than AC models to begin with. If battery weight and cost matter — car camping, RV overnight, road trips — a 12V DC blanket fits a smaller station better than trying to run an AC blanket from a compact unit.

For a comparison of heating approaches, including the math on why a space heater drains a 1,000 Wh station in under an hour at full power, see Will a Portable Power Station Run a Space Heater?

What cold weather does to these numbers

LFP holds up better than NMC in cold, but it still loses usable capacity. According to data from PortablePowerLab and OutputReport reviewed at What People Get Wrong About Power Station Capacity in Cold Weather, a typical LFP station delivers roughly 75% of its labeled capacity at 14°F (−10°C) and closer to 85–90% at 32°F (0°C).

If your station will sit in a cold garage or unheated room during an outage, add 10–25% to the Wh numbers in the table above. A 1,500 Wh station running at 80% cold-weather capacity delivers about 1,200 Wh — still enough for a 100 W AC blanket at 8 hours (941 Wh needed), but without much room left for lights or phone charging.

For a full winter-outage scenario that combines a blanket, furnace fan, lights, and phone charging into one calculation, see A Winter Night Without Power: What Size Power Station Do You Need?

Frequently asked questions

Can I run a heated mattress pad from a portable power station?

Yes, if it is single-zone (around 100 W). A 100 W mattress pad for 8 hours needs a 1,500 Wh LFP station — same as the AC queen row above. Dual-zone pads with two controllers can draw 200 W or more. Check the label: a 200 W pad for 8 hours needs a 2,000 Wh LFP station (200 × 8 ÷ 0.85 ÷ 0.90 = 2,092 Wh).

Does eco mode affect an electric blanket?

Usually not. Most electric blankets draw less than 200 W continuously, which is below the threshold where eco mode cuts power. Blankets that cycle their elements down to near zero during the off phase could occasionally trigger eco mode, but reviewers running blankets overnight on portable stations rarely report that as an issue. The appliances that eco mode most reliably shuts off are motors and compressors — not resistive heating elements.