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Residential battery comparison profile

SAJ
B2S HV

A newer high-voltage LFP stack with larger usable-capacity options and 1C charge/discharge claims.

Research-based opinionConfirmed Australian residential pageChecked 28 July 2026
SAJ brand mark used because a reusable Australian product image is not yet available12.8–51.2 kWh
01

Manufacturer-sourced facts

What it is.

These are product facts, not a score or endorsement.

Usable capacity range
12.8–51.2 kWh
Module size
6.4 kWh
Architecture
DC-coupled
Phase support
Single-phase and Three-phase
Backup
Backup capable
Warranty
10 years
Cell chemistry
LFP
CEC status checked
B2S battery configurations are CEC-listed to 31 December 2027 and H2 inverter models are listed to dates extending to 16 April 2029.
Standout specification
12.8–51.2 kWh CEC-listed usable capacity with an official 10-year warranty and phase-matched H2 hybrid options
Show 7 model variants

These model names sit inside the family above. Capacity, phase and output still need to match the installed configuration.

  • B2-12.8-HV1-S
  • B2-19.2-HV1-S
  • B2-25.6-HV1-S
  • B2-32.0-HV1-S
  • B2-38.4-HV1-S
  • B2-44.8-HV1-S
  • B2-51.2-HV1-S
02

Our opinion

The buying view.

EDITORIAL OPINION - BASED ON THE CITED RESEARCH
“B2S is the more relevant SAJ family for larger battery targets. Its 1C claim is attractive, but household output remains limited by the selected H2 inverter, approved stack and network settings.”
Best suited to
Larger homes wanting a newer SAJ stack with high charge/discharge capability and broad capacity coverage
What stands out
12.8–51.2 kWh CEC-listed usable capacity with an official 10-year warranty and phase-matched H2 hybrid options
03

Cons and watch-outs

What to check before buying.

These are configuration trade-offs and questions to verify, not claims that the product is defective.

  • A large B2S stack does not automatically provide equally large AC output; the selected H2 inverter remains the household power limit.
  • The broad 12.8–51.2 kWh range includes different model suffixes and possible multi-stack arrangements that need installer confirmation.

Ask for these points to be answered against the exact model numbers and installed configuration in your quote.

04

Evidence trail

Check the sources.

Specifications can change by model revision, region and paired hardware. CEC approval is not proof of current availability or suitability. Confirm the model and final design with the manufacturer and an accredited Australian installer.

SAJ Australia - B2S high-voltage batteryOpen manufacturer source ↗SAJ Australia - H2 hybrid inverterOpen supporting source ↗SAJ Australia - B2S warranty and supportOpen supporting source ↗Clean Energy Council - approved batteriesOpen supporting source ↗CEC series: B2S, H2Search the household-scale approval register →Is something outdated or incorrect?Contact TechManPat with an update →

Evidence check

Last checked

Australian sources
Specifications last checked
28 July 2026
Price last checked
28 July 2026
Australian availability last checked
28 July 2026

What changed

  • New product: The newer 12.8–51.2 kWh usable B2S family is now included with explicit H2 inverter and backup checks.
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