Scenario finder — reverse runtime calculator
Tell us what you need to run and for how long. We'll calculate the minimum power station capacity (Wh) you need.
Recommended tier: —
Now find a model in your tier
Browse our database — every model is sorted by capacity. Look for one at or above your minimum, with some margin (we recommend 30–50% headroom so you're not constantly at 0%).
Frequently asked questions
Why does it suggest more capacity than I'd think?
The formula reverses the runtime calculation — it includes the inverter and BMS losses. If you want to run a 60 W device for 8 hours, the math is (60 × 8) / (0.88 × 0.92) = 593 Wh minimum, not 480 Wh. Plus we recommend 30–50% headroom so you're not constantly at 0%.
Should I buy at the minimum or go bigger?
Go bigger if your budget allows. Reasons: you'll add devices over time, cold weather and battery aging eat capacity, and frequently running down to 0% accelerates cell degradation. Most owners we hear from regret buying too small far more often than too large.
What about surge / startup loads?
The finder calculates steady-state capacity only. If you'll start motors (fridges, pumps, AC units), separately check that the unit's surge rating exceeds your device's startup spike — typically 3–5× the running watts. Compressor fridges spike to 1,000–1,200 W. Roof AC units spike to 2,500–3,500 W.