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Performance & Value

PowerQ EQ4000

7.16–25.04 kWh · LFP · All-in-one · Single-phase

FoxESSReleased 2024

66/ 100

Very good

Global

LFP12yr+ Warranty

The verdict. In our Performance & Value class, FoxESS PowerQ EQ4000 leads on capacity & usability. Home-battery reliability is rarely independently verified, so judge on chemistry, safety certification and the backing company.

23thof 76 in Performance & ValueTop halfclass average 63.6
Compare this battery →Ask Watt →
United States system boundary. This score belongs to the 120/240 V United States PowerQ system. PowerQ is unavailable in Australia, where EQ4800 is a separate DC battery pathway. The base PowerQ documents backup and grid-down solar operation, but the published below-20 ms transfer figure belongs to the separately specified Fox Hub G2 and is not a hub-free PowerQ capability. Source 1.Source 2.Source 3.

The assessment

How it scores, by category

Capacity & Usability84
Power & Efficiency80
Longevity (verified)60
Safety & Chemistry80
Guarantee & Backbone50
Energy Ecosystem45

Market position

23thof 76 in Performance & ValueTop half
516776

Our reading

PowerQ EQ4000 scores 66, placing 23 of 76 in the Performance & Value class against a class average of 63.6. Its strongest scoring dimension is capacity & usability (84), above the class average of 84. Energy Ecosystem (45) is the dimension with the most room to move. Key specifications: LFP, 95% round-trip efficiency, 3.8 kW continuous output.

Dietreich Farquharson · review.solar

The data

Chemistry
LFP
Power
3.8kW
Round-trip
95%
Cycle life
Not recorded
Technology architecture

All-in-one energy system

Architecture guide

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
Architecture describes the product boundary. It is not a system design or an equipment-pairing decision.

Usable capacity

Stated depth of discharge: 90%. Published usable energy: 7.16 kWh in the scored configuration. These values may have different measurement conditions.

7.16 kWh usableScored configuration: US1H-3.8-EQL2 with EQ4000-AL2. Published range 7.16–25.04 kWh.

The stated depth of discharge and published usable energy can have different test conditions or configuration limits. They do not by themselves establish nominal capacity or a reserve that is always inaccessible. Delivered AC energy and runtime also depend on the inverter, settings and loads.

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.

Usable capacity sourceDepth-of-discharge source

Capacity guarantee: minimum retained at year 12.5

7.2 kWhfull5.0at yr 12.5
60708090100Rated capacity 100%Guaranteed floor 70.0%Typical 10yr70.0%0yr5yr10yr12.5yr
Rated capacity (reference)Guaranteed floor: 70.0% at yr 12.5Typical battery warranty term: 10 yr

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.

Before you buy
Local positionUse a market view to check local availability, approvals and warranty scope.
Ask the installerWhat usable capacity, backup power and warranted operating conditions will the installed PowerQ EQ4000 configuration deliver?

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.

How far the evidence reaches

1 of 5 questions with rows in the rings reach beyond manufacturer claim; none is measured by review.solar.123456
  1. OutputManufacturer claim4 rows in the rings3 design facts beside the rings
  2. EnduranceReviewed absence only1 row in the rings4 warranty terms beside the rings
  3. SafetyCertified or regulator-listed1 of 5 rows in the rings beyond claim1 design fact beside the rings
  4. BackingManufacturer claim1 row in the rings1 warranty term beside the rings
  5. FitManufacturer claim4 rows in the rings1 design fact beside the rings
  6. FootprintNot assessed for batteries

Rings, outside in: manufacturer claim, certified or regulator-listed, third-party source. The centre is review.solar's own measurement, empty for every product today. Warranty terms and design facts that rest on the maker's own word are counted beside the rings; a reviewed absence, or one that reaches beyond the maker's claim, stays in them. How the evidence puzzle works

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. PowerQ firmware/security disclosure reviewed 5 October 2026: public corporate FoxESS policy V1.0 (July 2026) expressly covers inverter/battery ESS and firmware without stated market restriction; existing US PowerQ disclosure band 55 to 80. Exact support duration, firmware protections and offline operation remain unestablished; no AU availability or warranty transfer.

Help strengthen this record

These are published evidence gaps, not private submissions. A source is reviewed under the same methodology whether it comes from a reader, installer or manufacturer.

View the open evidence register
Change ledger

Product record history

1 change to this record · 4 products changed in this update
  1. Record updated

    Safety certification: Evidence sources

    Before
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    After
    https://solarequipment.energy.ca.gov/Home/DownloadtoExcel?filename=EnergyStorage; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Safety certificationSafety certification+1 in JSON record
8 changes to this record · 1 product changed in this update
  1. Record updated

    Global score

    Before
    66
    After
    66.5
    Primary datasheet
  2. Record updated

    Source revision

    Current text
    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. PowerQ firmware/security disclosure reviewed 5 October 2026: public corporate FoxESS policy V1.0 (July 2026) expressly covers inverter/battery ESS and firmware without stated market restriction; existing US PowerQ disclosure band 55 to 80. Exact support duration, firmware protections and offline operation remain unestablished; no AU availability or warranty transfer.

    The previous text is not reproduced here: both versions run to a full research paragraph. Both are in the JSON record linked below.

    Primary datasheet
  3. Record updated

    Firmware & security disclosure

    Before
    Firmware updates referenced; no security documentation
    After
    Security page or vulnerability disclosure published
    Firmware & security disclosureAU market evidence+2 in JSON record
  4. Record updated

    Energy Ecosystem pillar score

    Before
    42.6
    After
    45.4
    Primary datasheet
  5. Record updated

    Firmware & security disclosure: Evidence sources

    Before
    https://us.fox-ess.com/us-faq/; https://us.fox-ess.com/wp-content/uploads/2024/11/User-Manual-PowerQ-without-FOX-Hub-2.0-V1.0b.pdf
    After
    https://au.fox-ess.com/resource-support/vulnerability-disclosure-and-handling-policy; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Firmware & security disclosureFirmware & security disclosure+2 in JSON record
  6. Record updated

    Firmware & security disclosure: Evidence status

    Before
    reviewed_absence
    After
    sourced
    Firmware & security disclosureAU market evidence+2 in JSON record
  7. Record updated

    US Support Note

    Before
    FoxESS publishes exact US PowerQ system, EQ4000 battery and US-series warranty documents.
    After
    FoxESS publishes exact US PowerQ system, EQ4000 battery and US-series warranty documents. FoxESS publishes a corporate vulnerability-reporting and handling policy covering inverter/battery systems and firmware. Exact PowerQ security support duration, firmware signing, secure boot and offline-operation guarantees remain unestablished.
    Primary datasheetFirmware & security disclosure+2 in JSON record
  8. Record updated

    US Evidence sources

    Before
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
    After
    https://au.fox-ess.com/resource-support/vulnerability-disclosure-and-handling-policy; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
    Primary datasheetFirmware & security disclosure+2 in JSON record
19 changes to this record · 1 product changed in this update
  1. Record updated

    Safety certification: Evidence sources

    Before
    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
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Safety certificationSafety certification+2 in JSON record
  2. Record updated

    Round-trip efficiency (%): Evidence sources

    Before
    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
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Round-trip efficiency (%)Round-trip efficiency (%)+2 in JSON record
  3. Record updated

    Usable energy / DoD (%): Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2025/08/US-AIO-EQ4000-Datasheet-V2.2-20251210.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf
    Usable energy / DoD (%)+1 in JSON record
  4. Record updated

    Ingress protection (outdoor): Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Ingress protection (outdoor)+1 in JSON record
  5. Record updated

    AU Evidence sources

    Before
    https://au.fox-ess.com/contact-us; https://au.fox-ess.com/download/datasheets-9; https://cer.gov.au/document/cec-approved-inverters-0; https://cer.gov.au/document/cec-approved-solar-batteries-0; https://us.fox-ess.com/foxhub/; https://us.fox-ess.com/us-faq/; 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/2024/11/User-Manual-PowerQ-without-FOX-Hub-2.0-V1.0b.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
    After
    https://au.fox-ess.com/contact-us; https://au.fox-ess.com/download/datasheets-9; https://cer.gov.au/document/cec-approved-inverters-0; https://cer.gov.au/document/cec-approved-solar-batteries-0; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://us.fox-ess.com/foxhub/; https://us.fox-ess.com/us-faq/; https://us.fox-ess.com/wp-content/uploads/2024/11/User-Manual-PowerQ-without-FOX-Hub-2.0-V1.0b.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
    Primary datasheetAU market evidence+10 in JSON record
  6. Record updated

    EV charging integration: Evidence sources

    Before
    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/2024/11/User-Manual-PowerQ-with-FOX-Hub-2.0-V1.0a.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://us.fox-ess.com/wp-content/uploads/2024/11/User-Manual-PowerQ-with-FOX-Hub-2.0-V1.0a.pdf
    EV charging integrationEV charging integration+1 in JSON record
  7. Record updated

    Continuous power output (kW): Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Continuous power output (kW)+1 in JSON record
  8. Record updated

    Primary Source

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Primary datasheet+1 in JSON record
  9. Record updated

    Energy density / footprint: Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Energy density / footprint+1 in JSON record
  10. Record updated

    Modularity & scalability: Evidence sources

    Before
    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
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Modularity & scalabilityModularity & scalability+2 in JSON record
  11. Record updated

    Manufacturing track record: Evidence sources

    Before
    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
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://us.fox-ess.com/about-us-2/
    Manufacturing track recordManufacturing track record+1 in JSON record
  12. Record updated

    Warranty degradation guarantee: Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
    Warranty degradation guaranteeWarranty degradation guarantee+1 in JSON record
  13. Record updated

    Operating temperature range: Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Operating temperature range+1 in JSON record
  14. Record updated

    Thermal & fire mitigation: Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Thermal & fire mitigation+1 in JSON record
  15. Record updated

    Backup surge / motor-start capability: Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2024/11/US-PowerQ-datasheet-Non-US-Mainland-V1.1-20241112.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf
    Backup surge / motor-start capability+1 in JSON record
  16. Record updated

    Thermal load management: Evidence sources

    Before
    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/2024/11/User-Manual-PowerQ-with-FOX-Hub-2.0-V1.0a.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://us.fox-ess.com/wp-content/uploads/2024/11/User-Manual-PowerQ-with-FOX-Hub-2.0-V1.0a.pdf
    Thermal load managementThermal load management+1 in JSON record
  17. Record updated

    US Evidence sources

    Before
    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
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf; https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/Download/EN-PowerQ-EQ4000-HUB-warranty-20250707.pdf
    Primary datasheetUsable energy / DoD (%)+3 in JSON record
  18. Record updated

    Cell chemistry: Evidence sources

    Before
    https://us.fox-ess.com/wp-content/uploads/2025/08/US-AIO-EQ4000-Datasheet-V2.2-20251210.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260722/USAIOEQ4000DatasheetV2.220251210.pdf
    Cell chemistry+1 in JSON record
  19. Record updated

    AC terminal & connection protection: Evidence sources

    Before
    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/2024/11/User-Manual-PowerQ-with-FOX-Hub-2.0-V1.0a.pdf
    After
    https://us.fox-ess.com/Public/Uploads/uploadfile/files/20260929/USPowerQdatasheetV1.120241112.pdf; https://us.fox-ess.com/wp-content/uploads/2024/11/User-Manual-PowerQ-with-FOX-Hub-2.0-V1.0a.pdf
    AC terminal & connection protectionAC terminal & connection protection+1 in JSON record
5 changes to this record · 152 products changed in this update
  1. Record updated

    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.
    Round-trip efficiency (%)
  2. Evidence added

    DE Evidence sources

    Before
    Not previously recorded
    After
    https://de.fox-ess.com/; https://www.fox-ess.com/de/
    DE market evidenceDE market evidence
  3. Evidence added

    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.
    DE market evidenceDE market evidence
  4. Evidence added

    DE Certifications

    Before
    Not previously recorded
    After
    DE market evidenceDE market evidence
  5. Evidence added

    DE Status

    Before
    Not previously recorded
    After
    unavailable
    DE market evidenceDE market evidence
8 changes to this record · 78 products changed in this update
  1. Evidence added

    State

    Before
    Not previously recorded
    After
    reviewed_absence
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  2. Evidence added

    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
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  3. Evidence added

    State

    Before
    Not previously recorded
    After
    supported
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  4. Evidence added

    Value

    Before
    Not previously recorded
    After
    The current EQ4000 AIO datasheet publishes greater than 95% round-trip efficiency; 95% is used conservatively.
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  5. Evidence added

    Confidence

    Before
    Not previously recorded
    After
    high
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  6. Evidence added

    Confidence

    Before
    Not previously recorded
    After
    high
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  7. Evidence added

    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.
    Round-trip efficiency (%)Warranty throughput+1 in JSON record
  8. Evidence added

    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
    Round-trip efficiency (%)Round-trip efficiency (%)+1 in JSON record
2 changes to this record · 34 products changed in this update
  1. Record updated

    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
    Round-trip efficiency (%)Manufacturing track record
  2. Record updated

    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.
    Round-trip efficiency (%)

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.

  1. AU market evidence checked
  2. Core scorecard evidence checked
  3. DE market evidence checked
  4. US market evidence checked
  5. Series benchmark evidence checked
  6. Plain-language warranty summary checked

Evidence record (JSON)

Scored by Solar Analytica Research

Further reading from Findings

Stay across the benchmark.

New scorecards, score changes and market signals, published as they happen.