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Home battery · SAJ · CEC approved February 2026
A 51.2 kWh home battery — very big home size, the 40+ kWh band.
Read from the figures on this page — no review written yet
The numbers that matter for a home. The full datasheet is below.
Usable capacity
How much energy it stores for you to use
Continuous power
How much it can run at once — enough for a whole home, air conditioning included
Round-trip efficiency
How much of the energy you store comes back out
Depth of discharge
You can use the whole battery, not just part of it
Warranty
How long the manufacturer stands behind it
Battery chemistry
The cell type inside it
Every figure on file for the SAJ B2S, by section.
| Specification | Value |
|---|---|
| Cell & chemistry | |
| Chemistry | LiFePO4 |
| Cell type | standard |
| Capacity & power | |
| Nominal capacity | 51.2 kWh |
| Usable capacity | 51.2 kWh |
| Continuous power | 25.6 kW |
| Peak power | 25.6 kW |
| Depth of discharge | 100% |
| Round-trip efficiency | 100% |
| Nominal voltage | 512 V |
| Lifespan & degradation | |
| Cycle life | 6000 cycles |
| Modularity & stacking | |
| Modular / stackable | Yes |
| Maximum stack | 51.2 kWh |
| Backup & grid services | |
| Backup capable | No |
| VPP ready | No |
| Physical | |
| Dimensions (H×W×D) | 1460 × 725 × 380 mm |
| Weight | 468.4 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.
This warranty covers defects in materials and workmanship for ten years under proper use and installation. It excludes damages from improper installation, modifications, and environmental factors.
10
years
∞
MWh
50°
celsius
Level 0
No Backup
We have not verified this brand's Australian support structure. Confirm warranty arrangements with the manufacturer or your installer.
Suited to Perth climate
Rated to 50°C, which covers Perth's hottest days.
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
8 years in the Australian market
$48,640
Typical installed price, before rebates
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.
Usable capacity, for one battery system
This battery is one unit in the very big home band. The WA rebate caps at 10 kWh, but that is a rebate limit, not a sizing guide.
STC value for this 51.2 kWh battery
The SAJ B2-51.2-HV1-S against the closest-sized batteries from other brands.
| Specification | Deye BOS-G50Deye | Deye BOS-G50-ProDeye | |
|---|---|---|---|
| Usable capacity? | 51.2 kWh | 51.2 kWh | 51.2 kWh |
| Continuous power? | 25.6 kW | Not verified | Not verified |
| Peak power? | 25.6 kW | Not verified | Not verified |
| Round-trip efficiency? | 100%best value | 92% | 92% |
| Warranty | 10 years | 10 years | 10 years |
| Chemistry | LiFePO4 | LFP | LFP |
Specs from the CEC register and datasheet enrichment. Indicative — confirm exact figures with your installer.
Other CEC-approved products from SAJ available in Australia.
C6-100K-T9-40 (AS4777-2 2020)
100 kW · 3φ
C6-110K-T12-40 (AS4777-2 2020)
110 kW · 3φ
C6-125K-T12-40 (AS4777-2 2020)
125 kW · 3φ
C6-75K-T6-40 (AS4777-2 2020)
75 kW · 3φ
C6-99K-T9-40 (AS4777-2 2020)
99.999 kW · 3φ
CHS2-29.9K-T4-204.8V/280Ah/51.5kWh (AS4777-2 2020)
29.999 kW · 3φ
Compare quotes from SAA-accredited local installers — you choose which to act on. 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 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.