| Published capacity range | 257 kWh |
| Scored configuration | 257 kWh |
| Cell chemistry | LFP (LiFePO4) |
| Usable capacity | 257 kWh |
| Usable energy / DoD | 100% DoD |
| Continuous power output | 125 kW |
| Warranty period | 5 yr |
| Safety certification | UL9540 / IEC62619 |
| Reliability testing | Not independently tested |
| Manufacturing track record | 15+ years, field-proven |
Some values are estimated where independent verification was not available: see the full scorecard and review.solar/terms.
PowerStack ST255CS-2H · 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 | |||
| Usable energy / DoD (%) | 100 | datasheet | Source +1 |
| Modularity & scalability | Fully modular / stackable expandable | datasheet | Source |
| Energy density / footprint | Bulky | datasheet | Source |
| Power & Efficiency | |||
| Continuous power output (kW) | 125.0 | datasheet | Source +1 |
| Operating temperature range | Standard | datasheet | Source |
| Backup surge / motor-start capability | No surge rating published (integrated / AC-coupled system) | reviewed absence | Source +1 |
| Longevity (verified) | |||
| Warranty period (yrs) | 5 | datasheet | Source +1 |
| Verified reliability | Not independently tested | reviewed absence | Source +1 |
| Safety & Chemistry | |||
| Cell chemistry | LFP (LiFePO4) | datasheet | Source |
| Safety certification | UL9540 / IEC62619 | datasheet | Source |
| Thermal & fire mitigation | Active thermal mgmt + fire suppression / cell isolation | datasheet | Source |
| AC terminal & connection protection | Not specified | reviewed absence | Source +1 |
| Ingress protection (outdoor) | IP54 / sheltered | datasheet | Source |
| Cell provenance & traceability | Undisclosed | datasheet | Source |
| Guarantee & Backbone | |||
| Warranty assurance | Parts only | datasheet | Source |
| Financial strength & warranty backing | Stable / listed | datasheet | Source +1 |
| Manufacturing track record | 15+ years, field-proven | datasheet | Source |
| Energy Ecosystem | |||
| Open protocol & API maturity | Modbus TCP + cloud API | datasheet | Source +1 |
| VPP & grid services readiness | No VPP capability | reviewed absence | Source +1 |
| EV charging integration | No EV integration | reviewed absence | Source +1 |
| Thermal load management | No thermal load integration | reviewed absence | Source +1 |
| Smart home & IoT depth | No local smart home integration | reviewed absence | Source +1 |
| Firmware & security disclosure | Vulnerability disclosure policy + firmware/security documentation published | datasheet | Source |
review.solar · audit sheet · Solar Analytica battery rubric v2.10.0 · https://review.solar/cards/sungrow-st255cs-2h-in