About This Data & Methodology
This site's rankings come from a dataset built for a school course project on programmatic SEO, published openly rather than presented as a large editorial team's work.
Who Built This
This project is maintained by a single researcher, not an editorial team. There is no in-house product testing lab โ no unit on this site has been physically tested by this project. Every spec traces to a manufacturer page, official manual, or named retailer listing, linked from each entity page's Methodology section. Where a spec could not be confirmed, it is marked as an open flag rather than filled in with a plausible-sounding number.
How Scoring Works
Each of the 37 use-case pages runs its own weighted formula against 20 verified entities โ capacity, surge rating, inverter type, price per watt-hour, and other factors, weighted differently per use-case because a CPAP night and a well-pump startup need genuinely different specs. See any use-case page's Methodology section for its exact weights, or the runtime calculator to check a specific combination of your own devices.
What Gets a Hard Disqualifier
Some use-cases exclude a unit outright rather than scoring it lower โ CPAP, oxygen concentrators, well/sump pumps, and similar require a confirmed pure sine wave inverter, since a modified sine wave or unconfirmed inverter type is a real equipment-safety risk, not a preference. An unconfirmed inverter_type is treated as a fail by default; it is never assumed safe.
Current Dataset Status
- 20 entities verified across 7 brands
- 4 entities fully verified with zero open data gaps; the rest carry specific, named open flags
- 37 use-case scoring formulas
- 10 head-to-head comparisons, limited to pairs that scored within a close range of each other โ not every possible pairing
- 58 supporting guides
What We Deliberately Don't Do
No star ratings without an actual testing methodology behind them. No "X units tested" claims for units that were not physically tested. No AggregateRating structured data on pages that don't have real review data behind it. Where a competitor site's number could not be independently verified in this project's own research, it is not reused as fact.
Corrections
Every entity page lists its exact source URL and verification date. If a spec has changed since that date, the open_flags system on this site is designed to surface exactly that kind of gap rather than hide it โ check the source link directly for the current figure.
Analytics & Cookies
This site can use Google Analytics 4 to count visits and see which pages people actually read. It is off by default. GA4 sets cookies, so nothing loads until you accept it: no script, no cookie, and no request to Google is made before that. Decline, or simply ignore the banner, and nothing about your visit is sent to Google.
Separately, and regardless of that choice, this site counts clicks on its own outgoing Amazon links. That count records three things: which page the link was on, where on the page it sat, and which product it pointed to. It sets no cookie, stores nothing in your browser, creates no visitor or session ID, and is sent only to this siteโs own server โ so there is nothing in it that identifies you or could later be tied back to you. It exists to show which recommendations people find useful, and it is the only measurement that runs without consent.
If you accept, GA4 records standard aggregate traffic data (pages viewed, approximate location, device and referrer) with IP anonymisation enabled. It is used to decide which use-cases and guides to expand โ nothing on this site is personalised to you, and no data is sold. You can change your mind at any time through the analytics and cookie settings link in the footer of every page.
Affiliate Disclosure
Some entity pages include a "View Price" link to Amazon. As an Amazon Associate, this site earns from qualifying purchases made through those links, at no extra cost to you. This relationship has no influence on scoring, ranking, or which units are marked with open data flags โ the scoring formulas and verification status are set before any commercial link is added, and a unit's inclusion or ranking has never been adjusted based on affiliate availability.