We want you to know exactly where every number on Tested Watts comes from. Every figure falls into one of three clearly labeled types.
Where our numbers come from
- Calculated estimates. Runtimes and sizing figures worked out from published specifications and standard efficiency assumptions. We always show the formula and the assumptions so you can check the math or plug in your own numbers.
- Manufacturer and public data. Capacities, outputs and charging specs from manufacturers, plus guidance from public agencies such as the CDC and FoodSafety.gov. We link to our sources.
- Hands-on measurements. Results from products we have used and measured ourselves. We are building our hands-on testing program; when an article includes our own measurements, it says so explicitly, and nothing else is presented as tested.
Our hands-on test protocol
When we test a power station ourselves, we use the same protocol every time so results are comparable:
- A 110–120 V, 60 Hz grid, the same standard as the United States.
- A plug-in watt meter to log real power draw and the watt-hours actually delivered.
- Usable capacity, real-world runtime with common household loads, startup surge handling, charging time and everyday use such as noise and weight.
Our independence
Commissions and ads never decide what we recommend. If a brand ever sends us a product, we will say so in the article, and it will not change the verdict. We may earn a commission if you buy through our links; see our Affiliate Disclosure.
Updates and corrections
Prices, models and firmware change often. We review our guides regularly, show the last-updated date on every article and fix confirmed errors. Spotted one? Tell us.
