About Backup Index

Backup Index compares backup power by what a unit actually delivers. We rank portable power stations by price per usable watt-hour, using capacity that independent testers measured, not the number printed on the box. Every figure links to its source, date and test method.

Who runs it

Backup Index is an independent site run by James Cowan. It launched in November 2026 and is still small.

What we do and don't do

• We collect and organize results from other people's tests. We do not run our own lab tests.
• We leave a model out when we cannot find a credible measured figure for it.
• Prices are checked by hand and dated, not live. See the methodology.

How the site earns money

We may earn a commission when you buy through links on this site, at no extra cost to you. Rankings are based on measured capacity and price, not on commissions. Some links on this site are affiliate links.

Corrections and contact

If a number is wrong or out of date, tell us at hello@backupindex.com. We check what you send against the source and fix confirmed errors.