| Published capacity range | 10–20 kWh |
| Scored configuration | 20 kWh |
| Usable capacity | 20 kWh |
| Continuous power output | 10.5 kW |
| Warranty period | 10 yr |
| Safety certification | UL9540 / IEC62619 |
Some values are estimated where independent verification was not available: see the full scorecard and review.solar/terms.
VARTA.wall BM1 · every criterion scored by the live rubric (Solar Analytica battery rubric v2.10.0), with its recorded value, evidence status, and any linked source. Page 1 carries the buying-decision summary; this page is the full record for verification and right of reply.
| Capacity & Usability | |||
| Modularity & scalability | Fully modular, ≤5 kWh increments, expandable in field | datasheet | Source +1 |
| Power & Efficiency | |||
| Continuous power output (kW) | 10.5 | datasheet | Source |
| Operating temperature range | Limited | datasheet | Source |
| Longevity (verified) | |||
| Warranty throughput | 2.5-5 MWh warranted per kWh usable | datasheet | Source |
| Warranty period (yrs) | 10 | datasheet | Source |
| End-of-warranty retained capacity (%) | 80 | datasheet | Source |
| Warranty degradation guarantee | End-point only: minimum capacity at end of warranty term | datasheet | Source |
| Safety & Chemistry | |||
| Safety certification | UL9540 / IEC62619 | datasheet | Source |
| Thermal & fire mitigation | Passive thermal mgmt | datasheet | Source |
| Ingress protection (outdoor) | Indoor only | datasheet | Source +1 |
| Cell provenance & traceability | Undisclosed | datasheet | Source +1 |
| Guarantee & Backbone | |||
| Warranty assurance | Parts only | datasheet | Source |
| Financial strength & warranty backing | Financial distress / going-concern risk | datasheet | Source +1 |
review.solar · audit sheet · Solar Analytica battery rubric v2.10.0 · https://review.solar/cards/varta-wall-bm1-de