Capacity
What can a 300 Wh power station run?
A 300 Wh power station gives about 255 Wh from its outlets: an average US fridge for about 3.6 h, a CPAP with humidifier for about 1.4 nights, or a modem and router for about 23.2 h.
| Device | Draw | Hours, one at a time |
|---|---|---|
| Modem + router (NRDC) | 11 W | 23.2 h |
| LED bulb (Philips) | 8.5 W | 30 h |
| CPAP, humidifier on (ResMed) | 22 W | 11.6 h |
| Laptop (Penn State) | 50 W | 5.1 h |
| Electric blanket, double (Penn State) | 100 W | 2.6 h |
| Fridge, US average (EIA) | 70.4 W | 3.6 h |
| Starlink Standard (Starlink) | 100 W | 2.6 h |
| Microwave drawing 1,100 W (Penn State) | 1,100 W | More than the 600 W output of any model this size we list |
300 Wh × 0.85 ÷ watts.
Running several at once? Add the watts, or use the calculator.
Stations about this size
EcoFlow RIVER 3 Plus
3.5 h average fridge
286 Wh
EcoFlow price, Oct 23
Check price at EcoFlow for the EcoFlow RIVER 3 PlusPaid linkBLUETTI Elite 30 V2
3.1 h average fridge
288 Wh · fridge only if it can start it
BLUETTI price, Oct 23
Check price at BLUETTI for the BLUETTI Elite 30 V2Paid link
Average US fridge (70.4 W). Unlike the table above, these include each station’s own draw where the maker lists it, which is why same-size stations differ; stations whose makers list none likely run shorter. Maker prices, Oct 23, 2026, unless dated. Checkout price applies. Photos: the makers. Cards marked “Illustration” use our own drawing where we have no photo.
Quick answers
How long will a 300 Wh power station run a fridge?
About 3.6 h for an average US fridge (70.4 W): 300 × 0.85 ÷ 70.4.
Can a 300 Wh power station run a microwave?
Only if its output is above the microwave’s draw, and then for about 14 min at 1,100 W. The models this size we list put out at most 600 W, so not a typical 1,100 W microwave.
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