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Rubix

Rubix Battery makes stackable LiFePO4 battery modules for residential and light commercial solar storage, including the Stack Series and the R-Series; the earlier Giga Stack Series is discontinued. Its documents describe Rubix as a product of Ark Battery and MillerTech.

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Owner rating5.0 / 51 reviewVerified reviews0Years in businessNot documentedCatalog products6

Products

6 in the catalog

History and sources

Certificate & document history

Certificate & document history
Observed

UL 1973: claimed

Rubix Stack Series RS51100 battery (51.2 V, 100 Ah, 5.12 kWh)

Battery pack claim; verification pending. A manufacturer claim, not a listing or certificate. Printed as "UL 1973" in the row "Battery Certification UL 1973, UL9540 DCESS" under Certifications in the specifications table for RS51100 (pages 34 and 35) of Rubix's Stack Series Owner's Manual (11617, 2026-01), captured October 2, 2026. Rubix's own Stack Series page (rubixbattery.com), captured October 2, 2026, prints "Certifications : UL 1973 (UL 9540A and UL 9540DC ESS pending)" in the 48V/100AH Key Specs for Model RS51100, and lists a "Stack Series UL 1973 Certification" download that was not captured or read. The documents differ: Rubix's Stack Series 48V specification sheet (version 3.1) for RS51100, captured October 2, 2026, prints "Battery Certification UL 9540A" in its Certifications section on page 3, and no UL 1973. The manual does not say which assembly or configuration was certified. No issuer, certificate or report number is printed; the issuer's record was not checked.

Official instruction manual: Stack Series Owner's Manual, Rubix Battery Checked · Earlier documentOfficial product page: Stack Series page, Rubix Battery Checked · Earlier document
Observed

UL 9540: claimed

Rubix Stack Series RS51100 battery (51.2 V, 100 Ah, 5.12 kWh)

Product / system scope unresolved. A manufacturer claim, not a listing or certificate. Printed as "UL9540 DCESS" (a DC energy storage system) in the row "Battery Certification UL 1973, UL9540 DCESS" under Certifications in the specifications table for RS51100 (pages 34 and 35) of Rubix's Stack Series Owner's Manual (11617, 2026-01), captured October 2, 2026. The documents differ: Rubix's own Stack Series page (rubixbattery.com), captured October 2, 2026, prints "Certifications : UL 1973 (UL 9540A and UL 9540DC ESS pending)" in the 48V/100AH Key Specs for Model RS51100, so the product page calls the UL 9540 DC ESS certification pending, and the specification sheet prints no UL 9540. UL 9540 applies to an energy storage system; no system configuration is named. No issuer, certificate or report number is printed; the issuer's record was not checked.

Official instruction manual: Stack Series Owner's Manual, Rubix Battery Checked · Earlier documentOfficial product page: Stack Series page, Rubix Battery Checked · Earlier document
Observed

UL 9540A: claimed

Rubix Stack Series RS51100 battery (51.2 V, 100 Ah, 5.12 kWh)

Battery pack claim; verification pending. A manufacturer claim, not a test report. Printed as "UL 9540A" in the row "Battery Certification UL 9540A" under Certifications on page 3 of Rubix's Stack Series 48V specification sheet (version 3.1) for RS51100, captured October 2, 2026. The documents differ: Rubix's own Stack Series page (rubixbattery.com), captured October 2, 2026, prints "Certifications : UL 1973 (UL 9540A and UL 9540DC ESS pending)" in the 48V/100AH Key Specs for Model RS51100, so the product page calls UL 9540A pending, and the owner's manual table for RS51100 prints no UL 9540A. UL 9540A is a fire test method, not a certification; no test level, laboratory or report number is printed and no report was checked.

Official datasheet: Stack Series 48V specification sheet, version 3.1, Rubix Battery Rev Version 3.1 · Checked · Earlier documentOfficial product page: Stack Series page, Rubix Battery Checked · Earlier document
Observed

UL 1973: claimed

Rubix Stack Series RS25200 battery (25.6 V, 200 Ah, 5.12 kWh)

Cell / component only. A manufacturer claim, not a listing or certificate. Printed as "Cell Certification UL 1973" under Certifications on page 3 of Rubix's Stack Series 24V specification sheet (version 3.1) for RS25200, captured October 2, 2026. The same Certifications block of the Stack Series Owner's Manual (11617, 2026-01, page 37, the RS25200 table) prints a dash and no standard after "Battery Certification", and Rubix's own Stack Series page prints "Certifications : UL 1973 (UL 9540A and UL 9540DC ESS pending)" in the 24V/200AH Key Specs without saying what it covers; the claim is recorded at the cell scope the specification sheet gives. No issuer, certificate or report number is printed; the issuer's record was not checked. Cell scope: a claim about the cells does not certify the assembled battery.

Official datasheet: Stack Series 24V specification sheet, version 3.1, Rubix Battery Rev Version 3.1 · Checked · Earlier documentOfficial instruction manual: Stack Series Owner's Manual, Rubix Battery Checked · Earlier documentOfficial product page: Stack Series page, Rubix Battery Checked · Earlier document
Observed

UL 1973: claimed

Rubix R-Series RRS51280 battery (51.2 V, 280 Ah, 14.336 kWh)

Cell / component only. A manufacturer claim, not a listing or certificate. Printed as "Cell Certification UL 1973" under Certifications on page 3 of Rubix's R-Series specification sheet (version 3.1) for RRS51280, captured October 2, 2026, and in the RRS51280 specifications table of the R-Series Owner's Manual (2026, page 20). Rubix's own R-Series page prints "Certifications : UL 1973" in the 48V/280AH Key Specs for Model RRS51280 without saying what it covers; the claim is recorded at the cell scope both the specification sheet and the manual give. No issuer, certificate or report number is printed; the issuer's record was not checked. Cell scope: a claim about the cells does not certify the assembled battery.

Official datasheet: R-Series 48V specification sheet, version 3.1, Rubix Battery Rev Version 3.1 · Checked · Earlier documentOfficial instruction manual: R-Series Owner's Manual, Rubix Battery Checked · Earlier documentOfficial product page: R-Series page, Rubix Battery Checked · Earlier document
Observed

UL 1973: claimed

Rubix R-Series RRS25560 battery (25.6 V, 560 Ah, 14.336 kWh)

Cell / component only. A manufacturer claim, not a listing or certificate. Printed as "Cell Certification UL 1973" under Certifications on page 3 of Rubix's R-Series specification sheet (version 3.1) for RRS25560, captured October 2, 2026, and in the RRS25560 specifications table of the R-Series Owner's Manual (2026, page 18). Rubix's own R-Series page prints "Certifications : UL 1973" in the 24V/560AH Key Specs for Model RRS25560 without saying what it covers; the claim is recorded at the cell scope both the specification sheet and the manual give. No issuer, certificate or report number is printed; the issuer's record was not checked. Cell scope: a claim about the cells does not certify the assembled battery.

Official datasheet: R-Series 24V specification sheet, version 3.1, Rubix Battery Rev Version 3.1 · Checked · Earlier documentOfficial instruction manual: R-Series Owner's Manual, Rubix Battery Checked · Earlier documentOfficial product page: R-Series page, Rubix Battery Checked · Earlier document
Observed

UL 9540A: claimed

Rubix Giga Stack Series RGS51100 battery (48 V, 100 Ah, 5.12 kWh)

Battery pack claim; verification pending. A manufacturer claim, not a test report. Printed as "UL9540A" in the RGS51100 column of the BATTERY CERTIFICATION row (the RGS51200 column reads "UL9540A PENDING") on page 2 of Rubix's Giga Stack Series specification sheet (version 3.1) and on page 14, General Specifications, of the Giga Stack Series Owner's Manual, both captured October 2, 2026; the column was read from the printed layout. The documents differ: the Giga Stack sell sheet prints "UL9540A PENDING" for both models and "UL9540A pending" on page 1. UL 9540A is a fire test method, not a certification; no test level, laboratory or report number is printed and no report was checked.

Official datasheet: Giga Stack Series specification sheet, version 3.1, Rubix Battery Rev Version 3.1 · Checked · Earlier documentOfficial instruction manual: Giga Stack Series Owner's Manual, Rubix Battery Checked · Earlier documentOfficial document: Giga Stack Series sell sheet, Rubix Battery Checked · Earlier document

Manufacturer history

Manufacturer history

No manufacturer history recorded yet.

Manufacturer & sources

Manufacturer & sources

This manufacturer is listed as Rubix. Manufacturing entities, factories, cell origin and model-specific ownership relationships have not been audited.

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5.0 / 51 review
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5.0 / 51 review
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5.0 / 51 review
Ease of install
4.0 / 51 review
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5.0 / 51 review

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