| Published capacity range | 6.96–28.8 kWh |
| Scored configuration | 6.96 kWh |
| Cell chemistry | LFP (LiFePO4) |
| Usable capacity | 6.96 kWh |
| Usable energy / DoD | 90% DoD |
| Continuous power output | 5 kW |
| Round-trip efficiency | 94% |
| Cycle life | 6000 cycles |
| Warranty period | 10 yr |
| Safety certification | UL9540 / IEC62619 |
| Reliability testing | Not independently tested |
| Manufacturing track record | 4-10 years (or new brand, strong parent heritage) |
Some values are estimated where independent verification was not available: see the full scorecard and review.solar/terms.
ECS CQ7 · every criterion scored by the live rubric (Solar Analytica battery rubric v2.9.0), with its recorded value, evidence status, and any linked source. Page 1 carries the buying-decision summary; this and the next page are the full record for verification and right of reply.
| Capacity & Usability | |||
| Usable energy / DoD (%) | 90 | est. | No link |
| Modularity & scalability | Fully modular / stackable expandable | stated | No link |
| Energy density / footprint | Average | stated | No link |
| Power & Efficiency | |||
| Round-trip efficiency (%) | 94 | est. | No link |
| Continuous power output (kW) | 5.0 | est. | No link |
| Backup switching speed | <20ms seamless relay switching (whole-home loads maintained through transition | stated | Source +1 |
| Operating temperature range | Standard | stated | No link |
| Longevity (verified) | |||
| Cycle life (cycles to 70%) | 6000 | est. | No link |
| Warranty throughput | >=5 MWh warranted per kWh usable (or >=5000-cycle equivalent) | stated | Source |
| Warranty period (yrs) | 10 | stated | No link |
| End-of-warranty retained capacity (%) | 80 | est. | No link |
| Verified reliability | Not independently tested | stated | No link |
| Cell balancing architecture | Passive cell-level balancing (charge dissipation) | est. | No link |
| Warranty degradation guarantee | End-point only: minimum capacity at end of warranty term | est. | No link |
| Safety & Chemistry | |||
| Cell chemistry | LFP (LiFePO4) | stated | No link |
| Safety certification | UL9540 / IEC62619 | stated | No link |
| Thermal & fire mitigation | Passive thermal mgmt | stated | No link |
| AC terminal & connection protection | Standard terminal protection, no active monitoring | stated | No link |
| Ingress protection (outdoor) | IP54 / sheltered | stated | No link |
| Cell provenance & traceability | Undisclosed | stated | No link |
review.solar · audit sheet · Solar Analytica battery rubric v2.9.0 · https://review.solar/cards/foxess-co-ltd-foxess-ecs-cq7-battery-stack
ECS CQ7 · continued from page 2 · Solar Analytica rubric Solar Analytica battery rubric v2.9.0.
| Guarantee & Backbone | |||
| Warranty assurance | Parts & labour | est. | No link |
| Financial strength & warranty backing | Stable / listed | stated | No link |
| Manufacturing track record | 4-10 years (or new brand, strong parent heritage) | stated | No link |
| Energy Ecosystem | |||
| Grid-forming & backup tier | Whole-home backup via paired hybrid inverter (capability is inverter-dependent | stated | No link |
| Open protocol & API maturity | Modbus TCP + cloud API | stated | No link |
| VPP & grid services readiness | VPP-capable (protocol ready, no confirmed live program) | stated | No link |
| EV charging integration | No EV integration | stated | No link |
| Thermal load management | Smart relay switching (excess solar triggered) | stated | No link |
| Smart home & IoT depth | Community integration (Home Assistant, no native support) | stated | No link |
| Firmware & security disclosure | No security or firmware documentation found | stated | Source +1 |
review.solar · audit sheet · Solar Analytica battery rubric v2.9.0 · https://review.solar/cards/foxess-co-ltd-foxess-ecs-cq7-battery-stack