How long will a 1000Wh battery run common devices?
Estimate how long a 1000Wh battery runs fridges, laptops, routers and more with realistic efficiency assumptions.
Quick take
A 1000Wh battery typically runs a 60W laptop for ~14–15 hours, or a 100W TV for ~8–9 hours. Fridges vary widely due to compressor cycling.
How to use the calculator
- Open the calculator linked below.
- Enter the numbers that match your setup.
- Use our rules of thumb to sanity-check the result.
Rules of thumb
- LiFePO₄ inverters are ~85–92% efficient.
- Fridges average 40–70W but spike 400–1200W for a second.
- Runtime = (Wh × efficiency) ÷ average W.