About

This is a reference site on State of charge and backup reserve settings on home batteries and power stations: how the percentage is worked out, what the app shows, and how a reserve setting works, as set out in makers' manuals, kept deliberately narrow.

Facts on these pages come from published sources, such as makers' documentation, official pages and reference works, and each page links to the ones it used. Every page shows when it was last checked.

There are no ads here, and nothing is for sale.

What you read here is general information. The maker's own manual or documentation comes first, and where safety or the law calls for a qualified tradesperson, use one.