Power station runtime calculator

Choose a power station, add the appliances you'll actually run, and get a runtime estimate built from the manufacturer's own specs — including the check most calculators skip: whether the station can even start your motor loads.

Power station

Include expansion batteries (use the model's maximum capacity, if it has one)

Your loads

AC inverter efficiency: 0.85

0.85 is the factor Bluetti publishes in its own runtime formula. Real units vary roughly 0.80–0.90 depending on load.

Loads run on DC / USB instead of AC (uses a 0.92 factor)

Keep a 10% reserve (don't drain to zero)

The formula (see how we calculate for the full methodology):

• Runtime hours = capacity (Wh) × 0.85 ÷ average load (W) on AC; × 0.92 on DC. The 0.85 factor is the one Bluetti publishes in its own runtime FAQ — REPORTED. The 0.92 DC factor is a WattLong assumption — INFERRED. No separate depth-of-discharge penalty is stacked on top.

• Model specs (capacity, continuous and surge watts kept separate, solar input, cycle life) come from manufacturer product pages and manuals only — CONFIRMED where read off the manufacturer's own page, REPORTED where a dealer reproduces the spec sheet. Each model page names its source.

• If your load's start peak exceeds the model's surge rating, we show "can't start that load" instead of a runtime. A number would be a lie.

WattLong is reader-supported. Some links on this site are affiliate links: if you buy through them, we may earn a commission at no extra cost to you. See our affiliate disclosure. All results are estimates — verify with the manufacturer and a licensed electrician before relying on them.