| Published capacity range | 7.16–25.04 kWh |
| Scored configuration | 7.16 kWh |
| Cell chemistry | LFP (LiFePO4) |
| Usable capacity | 7.155 kWh |
| Usable energy / DoD | 90% DoD |
| Continuous power output | 3.8 kW |
| Round-trip efficiency | 95% |
| Warranty period | 12.5 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.
PowerQ EQ4000 · 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 | datasheet | Source +1 |
| Modularity & scalability | Fully modular / stackable expandable | datasheet | Source +1 |
| Energy density / footprint | Compact high-density (integrated) | datasheet | Source |
| Power & Efficiency | |||
| Round-trip efficiency (%) | 95 | datasheet | Source +1 |
| Continuous power output (kW) | 3.8 | datasheet | Source |
| Backup switching speed | <20ms seamless relay switching (whole-home loads maintained through transition | datasheet | Source |
| Operating temperature range | Standard | datasheet | Source |
| Backup surge / motor-start capability | Motor-start rating published (LRA) | datasheet | Source |
| Longevity (verified) | |||
| Warranty throughput | 2.5-5 MWh warranted per kWh usable | stated | Source |
| Warranty period (yrs) | 12.5 | datasheet | Source +1 |
| End-of-warranty retained capacity (%) | 70 | datasheet | Source +1 |
| Verified reliability | Not independently tested | not found | No link |
| Warranty degradation guarantee | End-point only: minimum capacity at end of warranty term | datasheet | Source +1 |
| Safety & Chemistry | |||
| Cell chemistry | LFP (LiFePO4) | datasheet | Source +1 |
| Safety certification | UL9540 / IEC62619 | datasheet | Source |
| Thermal & fire mitigation | Passive thermal mgmt | datasheet | Source |
| AC terminal & connection protection | Not specified | not found | No link |
| Ingress protection (outdoor) | IP65+ / IP66 outdoor-rated | datasheet | Source +1 |
| Cell provenance & traceability | Supplier named | 3rd party | No link |
review.solar · audit sheet · Solar Analytica battery rubric v2.9.0 · https://review.solar/cards/foxess-co-ltd-foxess-powerq-all-in-one-residential-battery-s
PowerQ EQ4000 · continued from page 2 · Solar Analytica rubric Solar Analytica battery rubric v2.9.0.
| Guarantee & Backbone | |||
| Warranty assurance | Parts only | datasheet | Source +1 |
| Financial strength & warranty backing | Stable / listed | secondary | No link |
| Manufacturing track record | 4-10 years (or new brand, strong parent heritage) | secondary | No link |
| Energy Ecosystem | |||
| Grid-forming & backup tier | Whole-home seamless backup: full load, <20ms switchover (self-contained or val | datasheet | Source |
| Open protocol & API maturity | Proprietary / no documented API | datasheet | Source |
| VPP & grid services readiness | VPP-capable (protocol ready, no confirmed live program) | datasheet | Source |
| EV charging integration | No EV integration | not found | No link |
| Thermal load management | No thermal load integration | not found | No link |
| Smart home & IoT depth | Community integration (Home Assistant, no native support) | secondary | No link |
| Firmware & security disclosure | No security or firmware documentation found | not found | No link |
review.solar · audit sheet · Solar Analytica battery rubric v2.9.0 · https://review.solar/cards/foxess-co-ltd-foxess-powerq-all-in-one-residential-battery-s