The assessment
How it scores, by category
Market position
The data
All-in-one energy system
Presents storage and power conversion as one integrated product or product platform.
- Product role
- Battery modules, inverter functions and controls are packaged as one purchasing architecture.
- Published range
- 7.16–25.04 kWh
- Phase
- Single phase
- Backup boundary
- Installation-specific
Usable capacity
90% of this battery’s nominal capacity is usable, 7.16 kWh in the scored configuration.7.16 kWh usableScored configuration: US1H-3.8-EQL2 with EQ4000-AL2. Published range 7.16–25.04 kWh.
The remaining 10% stays in the pack as reserve; the home never draws it.
Nominal capacity is not stated here. The usable kWh and the depth-of-discharge percentage are sourced separately, at times from different documents and different module counts, so dividing one by the other would produce a nominal figure no manufacturer published.
Usable capacity sourceDepth-of-discharge sourceCapacity guarantee: minimum retained at year 12.5
No year-by-year capacity schedule is published for this product - the manufacturer guarantees only this end-of-term minimum, not a specific decline curve. Capacity figure based on the sourced usable capacity of the base configuration; modular systems scale with additional modules.
Verification & sources
Market context
Global evidencechange in the site menu
Global benchmark. This scorecard is benchmarked globally. A global score does not imply local availability, certification, warranty coverage, or installer compatibility.
Benchmark anchor. The score uses the smallest exact US PowerQ configuration. The 7.16-25.04 kWh displayed range is usable energy rounded to two decimals from the published 7.95-27.82 kWh nominal range at 90% DoD. Scored model: US1H-3.8-EQL2 with EQ4000-AL2 · checked 2026-07-27. Evidence.
Sources & references · checked 2026-09-01
Strong evidence coverage
25 of 25 scored criteria link directly to a published source.
Values marked estimated, derived, or not found remain visible on the audit sheet and do not carry the same evidential weight as a linked source. Coverage measures direct links, not an independent guarantee that a claim is correct.
Record revision. FoxESS official company timeline rechecked 2026-08-23; PowerQ remains a US exact-product record and AU unavailable. First-market DE overlay review 2026-09-01: official German catalogues recorded; existing Australian and United States overlays and scores unchanged.
- Sourced valuesData card →
- Warranty summary12.5-year product warranty →
Show 6 more
- Archived copy of the primary sourcePDF ↗
- Grid-forming & backup tierManufacturer ↗
- Firmware & security disclosureManufacturer ↗
- Financial strength & warranty backingManufacturer ↗
- Manufacturing track recordManufacturer ↗
- Smart home & IoT depthManufacturer ↗
Product record history
5 changes to this record · 152 products changed in this update
Source revision
- Before
- FoxESS official company timeline rechecked 2026-08-23; PowerQ remains a US exact-product record and AU unavailable.
- After
- FoxESS official company timeline rechecked 2026-08-23; PowerQ remains a US exact-product record and AU unavailable. First-market DE overlay review 2026-09-01: official German catalogues recorded; existing Australian and United States overlays and scores unchanged.
DE Evidence sources
- Before
- Not previously recorded
- After
- https://de.fox-ess.com/; https://www.fox-ess.com/de/
DE Support Note
- Before
- Not previously recorded
- After
- fox-ess.com/de returns 404. de.fox-ess.com names EQ4800 and does not name PowerQ, US1H-3.8-EQL2 or EQ4000-AL2. EQ4800 is a different identity and is not transferred.
8 changes to this record · 78 products changed in this update
State
- Before
- Not previously recorded
- After
- reviewed_absence
Evidence sources
- Before
- Not previously recorded
- After
- https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf; https://us.fox-ess.com/wp-content/uploads/2025/08/US-AIO-EQ4000-Datasheet-V2.2-20251210.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
State
- Before
- Not previously recorded
- After
- supported
Value
- Before
- Not previously recorded
- After
- The current EQ4000 AIO datasheet publishes greater than 95% round-trip efficiency; 95% is used conservatively.
Confidence
- Before
- Not previously recorded
- After
- high
Confidence
- Before
- Not previously recorded
- After
- high
Value
- Before
- Not previously recorded
- After
- The exact PowerQ datasheet, EQ4000 datasheet and governing warranty publish throughput and retention limits but no cycle-count claim to the benchmark's 70% threshold.
Evidence sources
- Before
- Not previously recorded
- After
- https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf; https://us.fox-ess.com/wp-content/uploads/2025/08/US-AIO-EQ4000-Datasheet-V2.2-20251210.pdf
2 changes to this record · 34 products changed in this update
Manufacturing track record: Evidence sources
- Before
- After
- https://us.fox-ess.com/about-us-2/; https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
Source revision
- Before
- PowerQ US identity and separate AU EQ4800/CQ7 lifecycle boundary re-audited 2026-08-07
- After
- FoxESS official company timeline rechecked 2026-08-23; PowerQ remains a US exact-product record and AU unavailable.
This is review.solar's publication history. It does not claim the product changed on the recorded date, and it excludes compatibility, system pairing, installation suitability and relative leaderboard prose. Open the complete JSON record.
Evidence timeline
Recorded verification events for this scorecard. These are evidence checks, not historical score snapshots.
- Core scorecard evidence checked
- DE market evidence checked
- AU market evidence checked
- US market evidence checked
- Series benchmark evidence checked
- Plain-language warranty summary checked
Scored by Solar Analytica Research
Further reading from Findings
Stay across the benchmark.
New scorecards, score changes and market signals, published as they happen.
Our reading
PowerQ EQ4000 scores 66, placing 23 of 74 in the Performance & Value class against a class average of 63.0. Its strongest scoring dimension is capacity & usability (84), above the class average of 83. Energy Ecosystem scores 43, the lowest pillar for this product. The class average on energy ecosystem is 47. Key specifications: LFP, 95% round-trip efficiency, 3.8 kW continuous output.