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Fox ESS CQ6.6-L12 High Voltage Storage Battery

By Fox ESSSKU not documented

High-voltage stacked battery691.2 V
Evidence scoreResearch pending
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Basic specs79.44 kWhDischarge80 A max.Charge50 A recommendedPeak current: 110 A$ / rated kWhUnavailableWarrantyUnknownSee termsLifetime productionNot publishedSize468.07 L*W: 660 × H: 1,970 × D: 360 mm610.5 kg1,345.92 lb0.17 kWh/L*CertificatesNone on fileEvidence missing

Key specs

Units
Chemistry
LFP (LiFePO₄)
Official datasheet
Sources

Shared row across the system columns, read visually; no individual-module chemistry inferred.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Battery Type

Documented

Nominal energy
79.44 kWh
Official datasheet
Sources

Printed as 79.44.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, MODEL CQ6.6 / -L12 column, Nominal Energy [kWh]

Documented

Nominal voltage
691.2 V
Official datasheet
Sources

Printed as 691.2.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, MODEL CQ6.6 / -L12 column, Nominal Voltage [V]

Documented

Maximum discharge current
80 A
Official datasheet
Sources

The row names both directions. Footnote 1: The current is affected by temperature, cell voltage and SOC.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Max. Charge/Discharge Current [A], footnote 1

Documented

Maximum charge current
80 A
Official datasheet
Sources

The row names both directions. Footnote 1: The current is affected by temperature, cell voltage and SOC.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Max. Charge/Discharge Current [A], footnote 1

Documented

Peak discharge current
110 A
Official datasheet
Sources

60 seconds as printed; not a continuous-current claim.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Peak Discharge Current (60s) [A]

Documented

Operating voltage range
104.4 to 919.8 V
Shared table range: 104.4 ~ 919.8 V, as printed.Official datasheet
Sources

One merged row spanning all 13 system columns. This is the common range exactly as printed, not an individual configuration range. No per-column range is calculated.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Operating Voltage [V]

Documented

1 spec not documented yet: usable energyHelp fill in ›

All specs29
Chemistry
LFP (LiFePO₄)
Official datasheet
Sources

Shared row across the system columns, read visually; no individual-module chemistry inferred.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Battery Type

Documented

Nominal energy
79.44 kWh
Official datasheet
Sources

Printed as 79.44.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, MODEL CQ6.6 / -L12 column, Nominal Energy [kWh]

Documented

Usable energy
Not documented
Nominal voltage
691.2 V
Official datasheet
Sources

Printed as 691.2.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, MODEL CQ6.6 / -L12 column, Nominal Voltage [V]

Documented

Maximum discharge current
80 A
Official datasheet
Sources

The row names both directions. Footnote 1: The current is affected by temperature, cell voltage and SOC.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Max. Charge/Discharge Current [A], footnote 1

Documented

Maximum charge current
80 A
Official datasheet
Sources

The row names both directions. Footnote 1: The current is affected by temperature, cell voltage and SOC.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Max. Charge/Discharge Current [A], footnote 1

Documented

Peak discharge current
110 A
Official datasheet
Sources

60 seconds as printed; not a continuous-current claim.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Peak Discharge Current (60s) [A]

Documented

Operating voltage range
104.4 to 919.8 V
Shared table range: 104.4 ~ 919.8 V, as printed.Official datasheet
Sources

One merged row spanning all 13 system columns. This is the common range exactly as printed, not an individual configuration range. No per-column range is calculated.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Operating Voltage [V]

Documented

Recommended charge current
50 A
Official datasheet
Sources

The row names both directions.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Location: PDF page 2, Recommend Charge/Discharge Current [A]

Documented

Lifetime production

Not published

Published claims and calculations are not independently tested lifetime output.

Published claims and calculations, not independent test results.

Documents

1 on file
  • PDF
    Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10OfficialFox ESSOfficial datasheetJuly 10, 2026

    Our copy is kept as private evidence and is not available to download. SHA-256: 56fb517425290dbb193f6b6b40ee05020eb8ce8b5c8552bed65db7bf5cf7f970, captured .

    Source details
    Revision
    V1.3
    Revision date
    July 10, 2026

    Archived copy captured on 2026-11-04.

    Location: PDF page 1 cover; PDF page 2 TECHNICAL SPECIFICATIONS

    Retrieved

    Unchanged official original PDF from Alternative Research native public filter delivery. Acquisition timestamp retained; not a new capture. English, download label Global; no individual market established. Parser font warnings retained; original not repaired. System columns and named modules kept distinct. Claims are manufacturer statements, not independent tests.

    Open

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Warranty

No warranty terms on file.

Sellers

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Price history

No seller price history.

Owner reviews

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Evidence score

Research pending0% documented

The Evidence score uses the priorities you choose. It counts published documents, such as certificates and warranty terms, and it compares a documented figure with the best documented figure of the same kind. It does not count owner reviews, and it is not a verdict on product quality or on how many people have reviewed it. A low score can mean little is documented, or that a documented figure is below the best of its kind. Undisclosed data scores 0.

Missing for this product: Certificates evidence needed; Warranty term needed; Warranty energy disclosure evidence needed; Lifetime / capacity evidence needed; Cell model disclosure evidence needed.

High-voltage stacked batteries · Rated capacity

The warranty term and the lifetime energy are each scored against the best documented value for a home storage battery: a value earns its share of that best, times the weight. A documented value always earns points; an undisclosed one earns 0.

Lifetime / capacityResearch pending0 / 20

No qualifying figure · 20% weight

Not published. No lifetime-production bonus.

Not documented. Undisclosed data scores 0.

Official datasheet: Fox ESS CQ6.6 datasheet, V1.3, 2026/07/10 Rev V1.3 · July 10, 2026 · Checked · Earlier document

Research pending, 0 points: Certificates, Warranty term, Warranty energy disclosure, Cell model disclosure.

Computed from public specifications and evidence records. Warranty duration is not service quality; certificate evidence points are not a safety rating. Compatibility and installation limits still apply.

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Certificates

No certificates on file. Certificate guide

Parts and accessories

No sourced accessories or replacement parts listed yet.

Model history

Model identity

Model
CQ6.6-L12

Manufacturer SKU unknown

No historical observations recorded yet.

Community discussions

No discussions linked yet. Search DIY Solar Forum

Recalls / legal notices

No recalls or legal notices on file; this is not a complete recall or court search. All notices · Report a notice

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Fox ESSProducts, reviews and history
4.0 (1)

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