EcoFlow RIVER 2 Pro
- 768 Wh · 800 W output
- Solar input up to 220 W
- 17.2 lb
Runs a box fan ≈ 13.1 h
Check price on AmazonHow we calculate it
Runtime = capacity (Wh) × 0.85 ÷ 50 W
For a hot night you need about 480 Wh (400 Wh of energy plus inverter losses). Running other devices at the same time? Add them in the runtime calculator.
Tips to run your box fan longer
- A box fan on low uses only 30–50 W, far less than an air conditioner.
- DC fans (USB or 12 V) are even more efficient and avoid inverter losses.
- Point the fan across a damp towel or at an open window for extra cooling at night.
Frequently asked questions
How long will a 1000Wh power station run a box fan?
About 17 h, based on an average draw of 50 W and 85% inverter efficiency.
How many watts does a box fan use?
Typically about 50 W while running and up to 80 W for a moment at start-up. Averaged over time it draws about 50 W.
What size power station do I need for a hot night?
At least 480 Wh. The smallest model in our comparison that covers it is the EcoFlow RIVER 2 Pro (768 Wh, about 13.1 h).