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review.solar · Warranty summary
PowerQ EQ4000
7.16–25.04 kWh · LFP · All-in-one · Single-phase
FoxESS
12.5-year product warrantyUnited States
Reviewed 2026-07 · Document PowerQ warranty v2.6 plus EQ4000 V2.2, reviewed 2026-07-27
58/100
Fair
Guarantee & backbone
About this document
review.solar’s plain-language summary of the manufacturer’s warranty terms as at the review date. Not a legal instrument: verify current terms with the manufacturer before making a claim.
12.5yr
Warranty period
70%
Capacity at end of term
Parts only
Coverage

Capacity guarantee: minimum retained at year 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.

The guarantee
  • Standard product warranty: 12.5 years
  • Capacity retention: EQ-4000 battery module (integrated)
  • Accessories: 2-year warranty
  • Defects in materials and workmanship
  • Spare parts, product exchange, and logistics
  • Registration requirement
What voids or limits it
  • Labour and installation costs
  • Non-accredited installation
  • Force majeure and physical damage
  • Improper connectors and third-party components
  • Unauthorised repair or modification
  • Components not originally sold by Fox ESS
How to claim
A US-market product: as at mid-2026 not listed in FoxESS Australia's battery warranty policy (v2.6, 26 December 2025), which covers the EQ4800-L, CQ6, EP and ECS series for Australia and New Zealand. Full summary, conditions and sources: page 2.
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review.solar/warranties/foxess-co-ltd-foxess-powerq-all-in-one-residential-battery-s
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Page 2 · Complete warranty summaryFoxESS PowerQ All-in-One
Warranty period
Standard product warranty: 12.5 years
Warranted free from defects in materials and workmanship for 150 months (12.5 years) from installation, or no more than 155 months from shipment date, whichever comes first. The same period applies to the integrated Fox Hub G2 energy management unit.
Capacity retention: EQ-4000 battery module (integrated)
Integrated EQ-4000 modules are warranted to retain at least 70% of nominal energy for 12.5 years from initial installation, or until the module-size throughput limit is reached, whichever comes first: from 26.8 MWh (EQ-4000-H2, 7.95 kWh nominal) to 93.8 MWh (EQ-4000-H7, 27.82 kWh nominal). Conditional on ambient temperatures remaining between -10°C and 55°C throughout.
Accessories: 2-year warranty
Ancillary accessory products including dataloggers, meters, and current transformers supplied with the PowerQ system carry a separate 2-year warranty.
What’s covered
Defects in materials and workmanship
Confirmed defects are remedied by repair on site or at a designated Fox service centre, or supply of the closest equivalent product in the current range. Repaired or replaced products carry the remainder of the original term: replacement does not reset or extend it.
Spare parts, product exchange, and logistics
Covers spare-part replacement, exchange of defective products, and associated logistics costs. Repair labour, installation and reinstallation costs are explicitly excluded.
Registration requirement
Register via the Fox ESS warranty portal (warranty.foxesscloud.com) within six weeks of installation and commissioning. Without active registration and FoxCloud data communication, coverage may drop to a five-year term rather than the full 12.5 years.
Exclusions
Labour and installation costs: Repair, installation and reinstallation costs are not covered: parts and logistics are supplied, but removal and reinstallation labour is borne by the owner.
Non-accredited installation: Defects arising from installation by a non-accredited installer, or from improper commissioning, start-up, or operation, are excluded from all warranty obligations.
Force majeure and physical damage: Excludes damage from storm, lightning strike, overvoltage, fire, thunderstorm, flooding or transportation, plus cosmetic issues and wear and tear not adversely affecting function.
Improper connectors and third-party components: Excludes claims arising from connectors or components not supplied with the product or sourced independently by the installer or end-user.
Unauthorised repair or modification: Any unauthorised repair, reinstallation, or modification of the product voids warranty eligibility for the affected components.
Components not originally sold by Fox ESS: Components not initially sold by Fox ESS as part of the system are not covered: even if the same manufacturer or model as those Fox provided.
Transferability
Original purchaser only (distributor, solar retailer or accredited installer) and the end-user at the installation address. No transferability provision: it does not follow the product to a subsequent property owner.
How to make a claim
A US-market product: as at mid-2026 not listed in FoxESS Australia's battery warranty policy (v2.6, 26 December 2025), which covers the EQ4800-L, CQ6, EP and ECS series for Australia and New Zealand. The applicable document is the US-series Fox Warranty Policy administered by FoxESS USA Inc. (Los Angeles, CA). Confirm local warranty support and parts availability with your installer and FoxESS Australia Pty Ltd (Box Hill VIC, 1300 377 369) before purchase. ACL statutory guarantees apply regardless.
Source reference
DocumentFox Warranty Policy: US Series (Power Q, AIO EQ-4000, Fox Hub)
Version at auditVersion 2.6, 18 January 2025; reviewed 27 July 2026
Sourced byreview.solar, 2026-07
Manufacturerfox-ess.com

review.solar · complete warranty summary · review.solar/warranties/foxess-co-ltd-foxess-powerq-all-in-one-residential-battery-s · © Solar Analytica 2026