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Residential battery comparison profile

SAJ
B2S HV 5–25

The established 5–25 kWh high-voltage B2S stack with 1C operation and up to eight parallel stacks.

Research-based opinionConfirmed Australian residential pageChecked 7 August 2026
SAJ brand mark used because a reusable Australian product image is not yet available4.5–22.5 kWh
01

Manufacturer-sourced facts

What it is.

These are product facts, not a score or endorsement.

Usable capacity range
4.5–22.5 kWh
Module size
4.5 kWh
Architecture
DC-coupled
Phase support
Single-phase and Three-phase
Backup
Backup capable
Warranty
10 years
Cell chemistry
LFP
CEC status checked
The established 5–25 kWh B2S HV1-S and HV5-S configurations are CEC-listed to 31 December 2027. Confirm the exact stack and H2 inverter codes on the quote.
Standout specification
5–25 kWh per stack, 1C charge/discharge and up to eight parallel stacks
Show 10 model variants

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

  • B2-5.0-HV1-S
  • B2-10.0-HV1-S
  • B2-15.0-HV1-S
  • B2-20.0-HV1-S
  • B2-25.0-HV1-S
  • B2-5.0-HV5-S
  • B2-10.0-HV5-S
  • B2-15.0-HV5-S
  • B2-20.0-HV5-S
  • B2-25.0-HV5-S
02

Our opinion

The buying view.

EDITORIAL OPINION - BASED ON THE CITED RESEARCH
“This is the established B2S family, not the newer 12.8–51.2 kWh product. Keeping them separate makes the approval and capacity evidence much easier to verify in a quote.”
Best suited to
Homes wanting an established SAJ H2-compatible stack in familiar 5 kWh nominal increments
What stands out
5–25 kWh per stack, 1C charge/discharge and up to eight parallel stacks
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.

  • Its advertised 5–25 kWh range is nominal; current CEC usable capacities are 4.5–22.5 kWh.
  • Parallel-stack capability does not determine household AC output; the selected H2 inverter and network limit remain decisive.

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 5–25 kWh high-voltage batteryOpen manufacturer source ↗SAJ Australia - H2 hybrid inverterOpen 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
7 August 2026
Price last checked
7 August 2026
Australian availability last checked
7 August 2026

What changed

  • Specifications updated: The established 5–25 kWh B2S approval ladder is now separated from the newer 12.8–51.2 kWh family so model and eligibility claims are not mixed.
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