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Home battery · SAJ · B2 series · CEC approved April 2026

SAJ B2-25.0-HV1

A 25 kWh home battery. Medium home size, the 20 to 30 kWh band.

Installed in Perth, after rebates: ~$18,164Estimate: your own quote will vary
WA Battery Scheme rebate: Depends on your inverterThe scheme needs a Synergy-approved inverter; we don't know yours
Usable capacity: 25kWh
Warranty: 10yrs

B2-25.0-HV1: the short answer

In the B2 seriesOne of 5 sizes, from 4.8 to 24 kWh: 25kWhOne of 5 sizes, from 4.8 to 24 kWh
WA Battery SchemeThe scheme needs a Synergy-approved inverter; we don't know yours: Check eligibilityThe scheme needs a Synergy-approved inverter; we don't know yours
Continuous powerRuns enough for a whole home, air conditioning included: 15kWRuns enough for a whole home, air conditioning included

Other sizes in the B2 series

What we can tell you

Read from the figures on this page. No review written yet.

25 kWh sits in the medium home band (20 to 30 kWh).
It is CEC-approved, which is a condition of both the federal STC discount and the WA Battery Scheme.
We can't score it: a value score needs a price and full specs, and without them any number would be guesswork.

Key specs, in plain terms

The numbers that matter for a home. The full datasheet is below.

Usable capacity: 25kWh; How much energy it stores for you to use
Continuous power: 15kW; How much it can run at once: enough for a whole home, air conditioning included
Round-trip efficiency: 95%; How much of the energy you store comes back out
Depth of discharge: 95%; How much of the battery you can actually use
Warranty: 10yr; 60% of capacity guaranteed at the end of it
Battery chemistry: N/A; The cell type inside it

Warranty and support

The warranty covers defects for up to 10 years. Major exclusions include unauthorized modifications and improper installation. Claims can be started through your distributor or installer.

Product: 10 years; transferable; full replacement
At year 10: At least 60% of capacity
Throughput: 3.06 MWh
Installation: Must be installed by an SAA-accredited installer
Support: Not verifiedWe have not verified this brand's Australian support structure. Confirm warranty arrangements with the manufacturer or your installer.
Perth heat: Rated to 50°C, which covers Perth's hottest days.

Warranty document Datasheet Compare warranties

WA Battery Scheme eligibility

Check eligibility

Synergy SSL inverter pairing, VPP participation and state-rebate qualification for this battery. Rebate and STC amounts are shown in the pricing panel.

CSIP-AUS compliant: Inverter must be CSIP-AUS compliant under the current WA framework.
Synergy SSL approved inverter: Needs pairing with a Synergy SSL approved inverter.
VPP activation ready: VPP activation requires a Synergy SSL approved inverter.
WA Battery Scheme rebate: Requires Battery Rewards participation under the current WA framework.
Synergy Battery Rewards: Requires a CSIP-AUS compliant system and reliable internet.
Interest-free loan: Not eligible for interest-free financing.

Under current WA rules, new rebate applications require VPP enrolment and CSIP-AUS compliance. How the scheme works · Estimate VPP earnings

Full datasheet

Every figure on file for the SAJ B2, by section.

Cell & chemistry

Chemistry: N/A
Cell type: N/A

Capacity & power

Nominal capacity: 25 kWh
Usable capacity: 25 kWh
Continuous power: 15 kW
Peak power: 15 kW
Depth of discharge: 95%
Round-trip efficiency: 95%
Nominal voltage: 512 V

Lifespan & degradation

Capacity retained at year 10: 60%
Warranted throughput: 3.06 MWh

Modularity & stacking

Modular / stackable: Yes
Maximum stack: 25 kWh

Backup & grid services

Backup capable: No
VPP ready: No

Physical

Dimensions (H×W×D): 1305 × 626 × 365 mm
Weight: 252.5 kg
IP rating: IP65

Operating environment

Operating temperature: -10°C to 50°C

Parsed from the manufacturer datasheet, install manual, and warranty document. Confirm against the linked PDFs before relying on a value for a quote or installation.

Documents

About SAJ

Years in the Australian market: 8+ (CEC-approved products since 2018)
Local support: Not verified
CEC-listed products: 34 models

View full profile →

What it costs in Perth

$23,750

Typical installed price, before rebates

WA Battery Scheme: Depends on your inverter
Federal STCs: −$5,586
You’d pay about: $18,164

The WA Battery Scheme (up to $1,300) needs a Synergy-approved inverter and VPP enrolment. We don't know which inverter you'd pair this with, so it isn't deducted above. Ask your installer. STCs assume about $39.9 a certificate. Estimates only; your quote will vary.

Explore your options

Which size band is your home?

Usable capacity, for one battery system

Smaller home: 10 to 15 kWh
Medium home: 20 to 30 kWh
Big home: 30 to 40 kWh
Very big home: 40+ kWh

This battery is one unit in the medium home band. The WA rebate caps at 10 kWh, but that is a rebate limit, not a sizing guide.

Does waiting change the rebate?

Estimated federal rebate (STCs) for this 25 kWh battery

How it compares

The SAJ B2-25.0-HV1 against the closest-sized batteries from other brands.

Specification	SAJ B2-25.0-HV1SAJ	Alpha ESS SMILE-M-BAT-5P VAlpha ESS	Ambrion AS3-5K-S-W-P5-AUSAmbrion

Usable capacity?	25 kWh	25 kWh	25 kWh
Continuous power?	15 kW	Not verified	Not verified
Peak power?	15 kW	Not verified	Not verified

Round-trip efficiency?	95%best value	92%	92%
Warranty	10 years	Not verified	Not verified
Chemistry	N/A	LFP	LFP

Specs from the CEC register and datasheet enrichment. Indicative: confirm exact figures with your installer.

More from SAJ

Other CEC-approved products from SAJ available in Australia.

SAJ Inverters

C6-100K-T9-40

100 kW · 3φ

C6-110K-T12-40

110 kW · 3φ

C6-125K-T12-40

125 kW · 3φ

C6-75K-T6-40

75 kW · 3φ

C6-99K-T9-40

99.999 kW · 3φ

CHS2-29.9K-T4-204.8V/280Ah/51.5kWh

29.999 kW · 3φ

View all SAJ inverters

View full SAJ manufacturer profile

Want to take the next step?

Get a quote from an installer from our network that covers your area. You choose whether to act on it. No obligation.

This model is one entry in the desk's index of solar batteries for Perth: every CEC-approved battery on one comparable dataset.

Product Information Disclaimer:

Product specifications, pricing, and availability are subject to change without notice. We make no warranties regarding product performance, longevity, or suitability for your specific needs.

Always verify specifications with the manufacturer and installer before purchase. Warranty terms are set by manufacturers and may have conditions not disclosed here. Battery performance degrades over time.

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