back to batteries

Performance & Value

EQ5500 High-Voltage Stack

10.92–49.14 kWh · LFP · DC-coupled

FoxESS

64/ 100

Good

Global

LFP100% Usable

The verdict. In our Performance & Value class, FoxESS EQ5500 High-Voltage Stack leads on capacity & usability. Home-battery reliability is rarely independently verified, so judge on chemistry, safety certification and the backing company.

34thof 76 in Performance & ValueTop halfclass average 63.0
Compare this battery →Ask Watt →

The assessment

How it scores, by category

Capacity & Usability90
Power & Efficiency76
Longevity (verified)56
Safety & Chemistry76
Guarantee & Backbone50
Energy Ecosystem39

Market position

34thof 76 in Performance & ValueTop half
486476

Our reading

EQ5500 High-Voltage Stack scores 64, placing 34 of 76 in the Performance & Value class against a class average of 63.0. Its strongest scoring dimension is capacity & usability (90), running 6.9 points above the class average on this dimension. Energy Ecosystem scores 39, the lowest pillar for this product. The class average on energy ecosystem is 47. Key specifications: LFP, 95% round-trip efficiency, 4.48 kW continuous output.

Dietreich Farquharson · review.solar

The data

Chemistry
LFP
Power
4.48kW
Round-trip
95%
Cycle life
Not recorded
Technology architecture

DC-coupled battery

Architecture guide

Stores DC energy and relies on system power electronics outside the battery product for household AC.

Product role
The published battery record covers the storage stack, controller and stated capacity range.
Published range
10.92–49.14 kWh
Phase
Not recorded
Backup boundary
Installation-specific
Architecture describes the product boundary. It is not a system design or an equipment-pairing decision.
Decision evidence

What the documents establish

Published evidence, source-reviewed non-disclosure and unresolved questions remain separate from the product score.

01Backup1 published · 0 reviewed absence · 0 not applicable · 3 open02Digital control0 published · 1 reviewed absence · 0 not applicable · 3 open03Battery behaviour9 published · 2 reviewed absence · 0 not applicable · 2 open06Service pathway6 published · 0 reviewed absence · 0 not applicable · 0 open

Usable capacity

100% of this battery’s nominal capacity is usable, 10.92 kWh in the scored configuration.

10.92 kWh usableScored configuration: EQ5500-L2. Published range 10.92–49.14 kWh.

No reserve is withheld at the stated depth of discharge.

At a sourced 100% depth of discharge the usable and nominal figures are the same number, so no separate nominal capacity is stated.

Usable capacity sourceDepth-of-discharge source

Capacity guarantee: minimum retained at year 10

10.9 kWhfull7.6at yr 10
60708090100Rated capacity 100%Guaranteed floor 70.0%70.0%0yr2yr4yr6yr8yr10yr
Rated capacity (reference)Guaranteed floor: 70.0% at yr 10

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 EQ5500 High-Voltage Stack 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 10.92 kWh base stack is scored; larger stacks receive no capacity-size advantage. Scored model: EQ5500-L2 · checked 2026-08-27. Evidence.

Sources & references · checked 2026-09-04

Strong evidence coverage

20 of 20 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. Exact family technical sources, Australian warranty and current regulator snapshot checked 2026-08-27 Battery performance register refresh 2026-08-31: battery/DC round-trip efficiency and cycles-to-70% closed or held from the exact governing sheet. First-market US and DE overlay review 2026-09-01: official regional catalogues recorded; Australian overlays and scores unchanged. T6 United States first-market overlay review 2026-09-04: official United States catalogues recorded; Australian and German overlays and scores unchanged.

Change ledger

Product record history

3 changes to this record · 17 products changed in this update
  1. Record updated

    US Evidence sources

    Before
    https://www.foxesscloud.com/us/product/battery
    After
    https://www.fox-ess.com/us/; https://www.foxesscloud.com/us/product/battery
    US market evidenceUS market evidence
  2. Record updated

    Source revision

    Current text
    Exact family technical sources, Australian warranty and current regulator snapshot checked 2026-08-27 Battery performance register refresh 2026-08-31: battery/DC round-trip efficiency and cycles-to-70% closed or held from the exact governing sheet. First-market US and DE overlay review 2026-09-01: official regional catalogues recorded; Australian overlays and scores unchanged. T6 United States first-market overlay review 2026-09-04: official United States catalogues recorded; Australian and German overlays and scores unchanged.

    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

    US Support Note

    Before
    The United States FoxESS battery shell does not retrieve EQ5500-L2. Held is not unavailable. EQ4800 and PowerQ are not transferred.
    After
    The United States FoxESS battery shell does not retrieve EQ5500-L2. fox-ess.com/us returns 404. Held is not unavailable. EQ4800 and PowerQ are not transferred.
    US market evidenceUS market evidence
9 changes to this record · 152 products changed in this update
  1. Evidence added

    US Status

    Before
    Not previously recorded
    After
    not_reviewed
    US market evidence
  2. Evidence added

    US Support Note

    Before
    Not previously recorded
    After
    The United States FoxESS battery shell does not retrieve EQ5500-L2. Held is not unavailable. EQ4800 and PowerQ are not transferred.
    US market evidence
  3. Record updated

    Source revision

    Current text
    Exact family technical sources, Australian warranty and current regulator snapshot checked 2026-08-27 Battery performance register refresh 2026-08-31: battery/DC round-trip efficiency and cycles-to-70% closed or held from the exact governing sheet. First-market US and DE overlay review 2026-09-01: official regional catalogues recorded; Australian overlays and scores unchanged.

    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
  4. Evidence added

    US Certifications

    Before
    Not previously recorded
    After
    US market evidence
  5. Evidence added

    DE Evidence sources

    Before
    Not previously recorded
    After
    https://de.foxesscloud.com/product/eq4800; https://www.foxesscloud.com/us/product/battery
    DE market evidenceUS market evidence
  6. Evidence added

    US Evidence sources

    Before
    Not previously recorded
    After
    https://www.foxesscloud.com/us/product/battery
    US market evidence
  7. Evidence added

    DE Certifications

    Before
    Not previously recorded
    After
    DE market evidenceUS market evidence
  8. Evidence added

    DE Support Note

    Before
    Not previously recorded
    After
    No German FoxESS catalogue naming EQ5500-L2 was retrieved. Held is not unavailable. EQ4800 is a different family.
    DE market evidenceUS market evidence
  9. Evidence added

    DE Status

    Before
    Not previously recorded
    After
    not_reviewed
    DE market evidenceUS market evidence
2 changes to this record · 61 products changed in this update
  1. Record updated

    Source revision

    Before
    Exact family technical sources, Australian warranty and current regulator snapshot checked 2026-08-27
    After
    Exact family technical sources, Australian warranty and current regulator snapshot checked 2026-08-27 Battery performance register refresh 2026-08-31: battery/DC round-trip efficiency and cycles-to-70% closed or held from the exact governing sheet.
    Primary datasheet
  2. Record updated

    Round-trip efficiency (%): Evidence sources

    Before
    https://au.fox-ess.com/Public/Uploads/uploadfile/files/20260612/ENEQ5500DatasheetAUV1.220260610.pdf
    After
    https://au.fox-ess.com/Public/Uploads/uploadfile/files/20260612/ENEQ5500DatasheetAUV1.220260610.pdf; https://www.fox-ess.com/Public/Uploads/uploadfile/files/20251231/ENEQ4800EQ5500ManualV1.0.8.pdf
    Primary datasheetCycle life (cycles to 70%)
2 changes to this record · 147 products changed in this update
  1. Evidence added

    Bc2Fd84C6514

    Before
    Not previously recorded
    After
    accepted at: 2026-08-29; category: battery; certification model: EQ5500-L2; jurisdiction: au_cec; match method: exact_normalized_single_record; product slug: foxess-eq5500-10-92-49-14-au; source key: data/batteries/foxess_eq5500_au.json; source manufacturer name: FOXESS CO LTD; validation: approved at: 2026-06-16; candidate model: EQ5500-L2; data confidence: High; evidence url: https://cer.gov.au/document/cec-approved-solar-batteries-0; expires at: 2027-12-31; list data version: au-cer-battery-2026-08-20-b3f077cbe945; list retrieved at: 2026-08-27T04:30:11Z; listing status at validation: listed
    Australian approved-product source identity
  2. Evidence added

    Certification model

    Before
    Not previously recorded
    After
    EQ5500-L2
    Australian approved-product source identity
1 change to this record · 6 products changed in this update
  1. Record added

    Product record

    kind: battery; brand: FoxESS; name: EQ5500 High-Voltage Stack; model: EQ5500-L2 through EQ5500-L9; scored reference EQ5500-L2; score: 63.9

    Primary datasheet

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. Core scorecard evidence checked
  2. US market evidence checked
  3. DE market evidence checked
  4. Australian certification source identity verified
  5. AU market evidence checked
  6. Series benchmark evidence checked
  7. Plain-language warranty summary checked

Evidence record (JSON)

Scored by Solar Analytica Research

Further reading from Findings

Australian buying guide

Place this scorecard beside the other Australian buyer-ready batteries, with quote questions and direct evidence coverage visible before you compare.

Open the guide →

Stay across the benchmark.

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