Fox ESS ECS4000-H4 High-Voltage Battery (15.9 kWh): ECS4000 stack figure from Fox ESS's own US ECS4000 datasheet, page 1: one CM module with three CS modules below it, the configuration of the ECS4000-H4 ("1*CM 3*CS"). Figure from the manufacturer's document, page 1.

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Image source: ECS4000 stack figure from Fox ESS's own US ECS4000 datasheet, page 1: one CM module with three CS modules below it, the configuration of the ECS4000-H4 ("1*CM 3*CS"). Figure from the manufacturer's document, page 1.

Fox ESS ECS4000-H4 High-Voltage Battery (15.9 kWh)

Name: Fox ESS ECS4000-H4 High-Voltage Battery (15.9 kWh)
Brand: Fox ESS

By Fox ESSSKU not documented

High-voltage stacked battery Stackable 230.4 V

Evidence score13/100Missing details

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Basic specs15.9 kWhDischarge50 A max.Charge50 A max.Peak current: 65 A $ / rated kWhUnavailable Warranty12.5 yearsSee terms Lifetime productionNot published Size127.79 L^*W: 570 × H: 590 × D: 380 mm143.3 kg315.92 lb0.12 kWh/L*CertificatesNone on fileEvidence missing

Key specs

Units

Chemistry: LFP (LiFePO4)
Official datasheet
Sources
Printed as "LFP (LiFePO₄)" in the row "Battery Type".
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Battery Type
Documented
Nominal energy: 15.9 kWh
Official datasheet
Sources
Printed as "15.9" in the row "Nominal Capacity [kWh]", ECS4000-H4 column. The text layer prints this column's values as quoted.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Nominal Capacity [kWh], ECS4000-H4 column
Documented
Nominal voltage: 230.4 V
Official datasheet
Sources
Printed as "230.4" in the row "Nominal Voltage [V]", ECS4000-H4 column.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Nominal Voltage [V], ECS4000-H4 column
Documented
Maximum discharge current: 50 A
Official datasheet
Sources
Printed as "50" in the row "Max. Charge / Discharge Current [A]", one value for every model.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Max. Charge / Discharge Current [A]
Documented
Maximum charge current: 50 A
Official datasheet
Sources
Printed as "50" in the row "Max. Charge / Discharge Current [A]", one value for every model.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Max. Charge / Discharge Current [A]
Documented
Peak discharge current: 65 A
Official datasheet
Sources
Printed as "65" in the row "Peak Discharge Current (60s) [A]"; for 60 seconds as printed.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Peak Discharge Current (60s) [A]
Documented
Operating voltage range: 194.4 to 262.8 V
Official datasheet
Sources
Printed as "194.4~262.8" in the row "Operating Voltage [V]", ECS4000-H4 column.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Operating Voltage [V], ECS4000-H4 column
Documented
Battery weight: 143.3 kg315.9 lb converted
Official datasheet
Sources
Printed as "143.3" (kilograms, before the pound figure) in the row "Weight [kg/lbs]", ECS4000-H4 column; the complete stack.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Mechanical characteristics, Weight [kg/lbs], ECS4000-H4 column
Documented

1 spec not documented yet: usable energyHelp fill in ›

All specs17

Chemistry: LFP (LiFePO4)
Official datasheet
Sources
Printed as "LFP (LiFePO₄)" in the row "Battery Type".
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Battery Type
Documented
Nominal energy: 15.9 kWh
Official datasheet
Sources
Printed as "15.9" in the row "Nominal Capacity [kWh]", ECS4000-H4 column. The text layer prints this column's values as quoted.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Nominal Capacity [kWh], ECS4000-H4 column
Documented
Usable energy: Not documented
Nominal voltage: 230.4 V
Official datasheet
Sources
Printed as "230.4" in the row "Nominal Voltage [V]", ECS4000-H4 column.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Nominal Voltage [V], ECS4000-H4 column
Documented
Maximum discharge current: 50 A
Official datasheet
Sources
Printed as "50" in the row "Max. Charge / Discharge Current [A]", one value for every model.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Max. Charge / Discharge Current [A]
Documented
Maximum charge current: 50 A
Official datasheet
Sources
Printed as "50" in the row "Max. Charge / Discharge Current [A]", one value for every model.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Max. Charge / Discharge Current [A]
Documented
Peak discharge current: 65 A
Official datasheet
Sources
Printed as "65" in the row "Peak Discharge Current (60s) [A]"; for 60 seconds as printed.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Peak Discharge Current (60s) [A]
Documented
Operating voltage range: 194.4 to 262.8 V
Official datasheet
Sources
Printed as "194.4~262.8" in the row "Operating Voltage [V]", ECS4000-H4 column.
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Electrical characteristics, Operating Voltage [V], ECS4000-H4 column
Documented

Lifetime production

Not published

Published claims and calculations are not independently tested lifetime output.

Published claims and calculations, not independent test results.

Documents

2 on file

PDF
Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28OfficialFox ESSOfficial datasheet
Source details
Revision
V1.5 | 2026/05/28
Revision date
Not stated
Archived copy captured on 2026-10-20.
Location: Page 2, Technical specifications table; page 1, product figure
Retrieved Oct 20, 2026
FOXESS CO., LTD.'s own two-page US datasheet (PDF), linked from the Downloads > Datasheets page of us.fox-ess.com and captured on October 20, 2026. The page 2 table is read from the rendered page: the PDF text layer prints the row labels and the column values in separate runs, so each cited value is quoted as it appears in the text layer and its row was confirmed on the rendered page. Manufacturer document, not an independent test.
Archived copies
Archived copy of a document published by Fox ESS. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived backup V1.5 | 2026/05/28 · 0.13 MB
Source first found
Oct 20, 2026
This copy captured
Oct 20, 2026, 2:15 PM UTC
Archived
Oct 20, 2026, 2:15 PM UTC
File details
Original source
Pages
2
Embedded creation date
Jun 22, 2026
Embedded modification date
Jun 22, 2026
Embedded dates are file metadata, not independent proof of publication.
SHA-256: d0db2d5f90b658522c67b485185fc214a0f1757e45607070380688a62b54dc89
Open
WEB
Fox ESS US product page: ECS4000 (October 20, 2026 capture)OfficialFox ESSOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-20.
Location: Page heading and summary
Retrieved Oct 20, 2026
Fox ESS's own US product page (us.fox-ess.com), captured on October 20, 2026 with the paced research fetcher; the content is whatever the address served on that date. Manufacturer claims, not independent tests; the page carries no revision date.
Open

Archive and older revisions0

Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.

Archived documents

Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28

Archived copy of a document published by Fox ESS. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.

Archived backup V1.5 | 2026/05/28 · 0.13 MB

Source first found: Oct 20, 2026
This copy captured: Oct 20, 2026, 2:15 PM UTC
Archived: Oct 20, 2026, 2:15 PM UTC

File details

Original source

Pages: 2
Embedded creation date: Jun 22, 2026
Embedded modification date: Jun 22, 2026

Embedded dates are file metadata, not independent proof of publication.

SHA-256: d0db2d5f90b658522c67b485185fc214a0f1757e45607070380688a62b54dc89

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Warranty

Warranty term: 12.5 years
Official datasheet
Sources
Printed as "12.5*1" in the row "Standard Warranty [year]"; footnote 1 says "Refer to Fox ESS Battery Warranty Terms and Conditions."
Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document
Location: Page 2, Warranty, Standard Warranty [year]
Documented

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Evidence score

13/100Missing details20% 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 details. This number counts only the evidence recorded so far. The source review for this product is not finished, or the maker has not disclosed enough, so the number can only go up.

Missing for this product: Certificates evidence 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.

Warranty term12.5 years12.5 / 20

12.5 years · 20% weight

12.5 of 20 years, the best documented for a home storage battery (printed by the maker): Bioenno Power 6V 3Ah LiFePO4 Battery (PVC, BLF-0603W)

Printed as "12.5*1" in the row "Standard Warranty [year]"; footnote 1 says "Refer to Fox ESS Battery Warranty Terms and Conditions."

62.5 / 100 × 20 = 12.5 points.

Official datasheet: Fox ESS datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document

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 datasheet (US): ECS4000 high voltage storage battery, V1.5 | 2026/05/28 Rev V1.5 | 2026/05/28 · Checked Oct 20, 2026 · Earlier document

Research pending, 0 points: Certificates, 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: ECS4000-H4

US market

No historical observations recorded yet.

Community discussions

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Recalls / legal notices

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