PowerLight is an independent comparison site. It's not a store or an official site for any of the brands featured here: we compare products sold on Amazon.com (EE. UU.) and earn an affiliate commission when someone buys through our links, at no extra cost to the buyer.
01What makes it into the catalog
A product makes it in when it solves a real power-backup problem during an outage — enough capacity for household equipment, not a loose phone charger — and its Amazon listing has the minimum technical specs needed to compare it with any rigor: capacity in Wh, output power, and battery chemistry. If those three data points aren't available from either the manufacturer or the listing, the product doesn't make it in: we'd rather have a smaller, verifiable catalog than a large one full of blanks.
02What we verify about each product
Every entry in the catalog is linked to a specific Amazon ASIN — the unique identifier for that exact product, not for the brand or the category — confirmed against the real listing page, not a name search. That's the difference between linking to the DELTA 3 we describe and linking to whatever Amazon decides to show first. When we've found a mismatched ASIN — it happened once with the DELTA 3, pointing to the DELTA 2 bundle's listing instead — we fixed it in the database, not the template, and logged it as the kind of error an automated cross-check won't catch on its own: it has to be reviewed product by product.
03Where the data comes from
Technical specs (capacity, power, weight, ports, solar input) come from the manufacturer or from the product's Amazon listing. When a data point isn't available, the spec sheet shows "—" instead of making it up.
04What the 0-10 scores are
Every product has six editorial scores — runtime, power, portability, solar charging, expandability, and value — calculated from the technical specs, normalized across the range of products we compare (the highest on each axis in the catalog hits 10, the lowest starts near 0) — regardless of brand, so comparing across brands stays fair. They aren't an Amazon or manufacturer data point: they're our own read for the specific use case of power backup during an outage, and they get recalculated whenever the catalog changes. They're always labeled "editor's rating."
05What we can't know
Why we don't recommend a shipping method
This site compares equipment, not logistics. We don't suggest which shipping agency to use, how easy a model is to ship, or "ships easily" labels — that call depends on the agency, the date, and rules that change without notice, and an outdated label on a spec sheet can cost real money to anyone who follows it to the letter. What we do publish is the objective data any agency needs to quote a shipment — capacity in Wh, battery chemistry, weight and dimensions, exact model — so the decision on how to ship it is made by whoever has up-to-date information, not a spec sheet that isn't updated every day.