Every watt-hour leaving the AC outlets passed through an inverter that kept some of it as heat. This 2026 ranking uses only efficiency figures an independent party measured and published; a brand's own claim, however plausible, does not get a station onto this page.
By the BatteryRank Engineering Team
Reading this ranking
This is the only ranking on the site where evidence, not performance, is the entry requirement: a station appears solely because an independent party published a measurement. Most of the catalog is missing from this page for that reason, and the absence is the finding — conversion loss is the gap between the energy you bought and the energy that reaches the appliance, and almost nobody measures it.
Expecting the difference to change a purchase. The spread between the best and worst measured figures here is a handful of percentage points, which is a meaningful number of watt-hours across a three-day outage and an invisible one across an evening. It is a tie-breaker between finalists, not a reason to reopen a decision.
Independent measurements come from different reviewers using different loads on different sample units, and efficiency varies with how hard the inverter is working. Taking the midpoint of a published range makes them comparable enough to order, but it flattens real methodological differences we cannot reconcile, and a single tested unit is not a production average.
Durability and Trust carry it; Capacity is the drag.
Capacity and Durability carry it; Portability is the drag.
Durability and Charging carry it; Capacity is the drag.
Durability and Trust carry it; Capacity is the drag.
Trust and Charging carry it; Portability is the drag.
Trust and Quiet carry it; Charging is the drag.
Trust and Portability carry it; Capacity is the drag.
Trust and Durability carry it; Charging is the drag.
Trust and Durability carry it; Charging is the drag.
Trust and Capacity carry it; Portability is the drag.