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Home battery · SAJ · CEC approved April 2025

SAJ CHS2-29.9K-T4-256.0V/280Ah/64.4kWh (AS4777-2 2020)

A 64.4 kWh home battery — very big home size, the 40+ kWh band.

Installed in Perth, after rebates: ~$51,017; Typical estimate — your own quote will vary
WA Battery Scheme rebate: Depends on your inverter; The scheme needs a Synergy-approved inverter — we don't know yours
Usable capacity: 64.4kWh; Very big home size — the 40+ kWh band

What we can tell you

Read from the figures on this page — no review written yet

64.4 kWh sits in the very big home band (40+ 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 How much energy it stores for you to use: 64.4kWh
Round-trip efficiency How much of the energy you store comes back out: 92%
Depth of discharge How much of the battery you can actually use: 90%
Warranty 70% of capacity guaranteed at the end of it: 10yr
Battery chemistry Lithium iron phosphate — the long-cycle-life type: LFP

Full datasheet

Every figure on file for the SAJ CHS2, by section.

Full datasheet, by section
Specification	Value
Cell & chemistry
Chemistry	LFP
Capacity & power
Nominal capacity	71.6 kWh
Usable capacity	64.4 kWh
Lifespan & degradation
Capacity retained at year 10	70%
Warranted throughput	0 MWh
Physical
IP rating	IP55
Operating environment
Operating temperature	-30°C to 50°C
Installation requirements
Top clearance	100 mm
Side clearance	100 mm
Front clearance	100 mm
AC breaker	200 A
Cable gauge	50 mm²
Earthing method	TN-S
DNSP pre-approval	Yes
Estimated install time	5 hrs

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

Warranty and support

Warranty terms and Australian support structure.

This warranty covers the CHS2 battery system for 10 years, ensuring 70% usable energy retention. Report defects within 30 days to make a claim.

Duration

years

Throughput

—

not on record

Max Temp

50°

celsius

Max Backup

Level 0

No Backup

Australian support structure

Not verified

We have not verified this brand's Australian support structure. Confirm warranty arrangements with the manufacturer or your installer.

Perth climate suitability

Suited to Perth climate

Rated to 50°C, which covers Perth's hottest days.

Key warranty terms

•Depth of Discharge: 90% usable capacity
•Round-trip Efficiency: 92% rated
•Annual Degradation: ~2.5% per year expected
•Installation: Must be installed by SAA-accredited installer
•Operating Conditions: -30°C to 50°C

✗ Non-transferableFull replacement≥70% capacity at year 10

Warranty Document Datasheet Compare Warranties

WA Battery Scheme eligibility

Conditional

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

AC-coupled system: needs a gateway device on the Synergy SSL (e.g. SMA, Redback), or a same-brand inverter + battery pair (Sungrow or Fronius) for shared compliance. Without one, export is limited to 1.5kW and VPP/DEBS/rebate/loan are unavailable — and third-party gateways can struggle to meet compliance testing. Any later addition to an AC-coupled system triggers whole-of-site compliance, so for many homes replacing toward a hybrid (DC-coupled) inverter is the sounder path. AC vs DC coupling

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

About SAJ

View Full Profile →

Years in AU Market8+ years

Local SupportNot verified

CEC-Listed Products30 models

8yr AU

CEC-approved products since 2018

8 years in the Australian market

Fault & error codes — SAJ CHS2

Extracted from the installation manual

36 documented

Showing 36 of 36. The official install manual is the authoritative source — always confirm before acting.

1criticalCall your installer
Manual (PDF)
Master Relay Error
Likely cause
Faulty relay or control circuit issue.
What to do
Contact installer for repair.
16criticalCall your installer
Manual (PDF)
Off Grid Output Voltage Low
Likely cause
Low voltage detected at off-grid output.
What to do
Check connections; contact installer for inspection.
17criticalCall your installer
Manual (PDF)
Off Grid Output Short Circuit
Likely cause
Short circuit at off-grid output.
What to do
Disconnect and check wiring immediately; contact installer.
2criticalCall your installer
Manual (PDF)
Master EEPROM Error
Likely cause
Corrupted EEPROM data.
What to do
Contact installer for replacement.
24criticalCall your installer
Manual (PDF)
Master No Grid Error
Likely cause
Loss of grid connection.
What to do
Check grid connection; contact installer if issue persists.
25criticalCall your installer
Manual (PDF)
DC Reverse Connect Error
Likely cause
Reverse DC connection detected.
What to do
Disconnect and inspect connections; contact installer.
27criticalCall your installer
Manual (PDF)
GFCI Error
Likely cause
Issue with Ground Fault Circuit Interrupter.
What to do
Inspect GFCI; contact installer if issues continue.
31criticalCall your installer
Manual (PDF)
ISO Error
Likely cause
Isolation issue detected.
What to do
Inspect isolated grounding; contact installer.
35criticalCall your installer
Manual (PDF)
Master Grid Phase Lost
Likely cause
Phase loss detected in grid.
What to do
Contact installer for repair.
6criticalCall your installer
Manual (PDF)
GFCI Device Error
Likely cause
Fault in Ground Fault Circuit Interrupter.
What to do
Inspect GFCI; contact installer if issues continue.
10warningCall your installer
Manual (PDF)
Master Phase1 Voltage Low
Likely cause
Undervoltage condition on phase 1.
What to do
Check phase voltage; contact installer if persists.
11warningCall your installer
Manual (PDF)
Master Phase2 Voltage High
Likely cause
Overvoltage condition on phase 2.
What to do
Check phase voltage; contact installer if persists.
12warningCall your installer
Manual (PDF)
Master Phase2 Voltage Low
Likely cause
Undervoltage condition on phase 2.
What to do
Check phase voltage; contact installer if persists.
13warningCall your installer
Manual (PDF)
Master Phase3 Voltage High
Likely cause
Overvoltage condition on phase 3.
What to do
Check phase voltage; contact installer if persists.
14warningCall your installer
Manual (PDF)
Master Phase3 Voltage Low
Likely cause
Undervoltage condition on phase 3.
What to do
Check phase voltage; contact installer if persists.
15warning
Manual (PDF)
Grid Voltage 10Min High
Likely cause
Persistent high grid voltage.
What to do
Monitor grid voltage; contact installer if necessary.
18warning
Manual (PDF)
Master Grid Frequency High
Likely cause
Grid frequency higher than normal range.
What to do
Monitor grid frequency; contact installer for persistent issues.
19warning
Manual (PDF)
Master Grid Frequency Low
Likely cause
Grid frequency below normal range.
What to do
Monitor grid frequency; contact installer.
20warning
Manual (PDF)
BAT Input Mode Error
Likely cause
Battery input mode misconfigured or error in connection.
What to do
Check battery configuration; contact installer if persists.
21warningCall your installer
Manual (PDF)
Phase1 DCV High
Likely cause
High voltage on Phase 1 DC input.
What to do
Check DC input; contact installer if persists.
22warningCall your installer
Manual (PDF)
Phase2 DCV High
Likely cause
High voltage on Phase 2 DC input.
What to do
Check DC input; contact installer if persists.
23warningCall your installer
Manual (PDF)
Phase3 DCV High
Likely cause
High voltage on Phase 3 DC input.
What to do
Check DC input; contact installer if persists.
26warningCall your installer
Manual (PDF)
Parallel machine CAN Com Error
Likely cause
Communication error in parallel systems.
What to do
Inspect connections; contact installer if persists.
28warningCall your installer
Manual (PDF)
Phase1 DCI Error
Likely cause
Current input issue on Phase 1.
What to do
Check phase connections; contact installer if necessary.
29warningCall your installer
Manual (PDF)
Phase2 DCI Error
Likely cause
Current input issue on Phase 2.
What to do
Check phase connections; contact installer if necessary.
3warningCall your installer
Manual (PDF)
Master Temperature High Error
Likely cause
Overheating of the unit.
What to do
Check ventilation and cooling; contact installer if persists.
30warningCall your installer
Manual (PDF)
Phase3 DCI Error
Likely cause
Current input issue on Phase 3.
What to do
Check phase connections; contact installer if necessary.
32warningCall your installer
Manual (PDF)
Bus Voltage Balance Error
Likely cause
Internal bus voltage imbalance detected.
What to do
Contact installer for inspection.
33warningCall your installer
Manual (PDF)
Master Bus Voltage High
Likely cause
Bus voltage exceeding limits.
What to do
Contact installer for inspection.
34warningCall your installer
Manual (PDF)
Master Bus Voltage Low
Likely cause
Bus voltage below limits.
What to do
Contact installer for inspection.
36warningCall your installer
Manual (PDF)
Master PV Voltage High
Likely cause
PV voltage exceeds safe limits.
What to do
Check PV connection; contact installer if persists.
4warning
Manual (PDF)
Master Temperature Low Error
Likely cause
Under temperature due to environmental factors.
What to do
Ensure unit is within operating temperature; contact installer if persists.
5warning
Manual (PDF)
Lost Communication MS
Likely cause
Communication failure between master and slave.
What to do
Restart system; contact installer if persists.
7warningCall your installer
Manual (PDF)
DCI Device Error
Likely cause
Issue with DC input circuit.
What to do
Contact installer for inspection and repair.
8warningCall your installer
Manual (PDF)
Current Sensor Error
Likely cause
Faulty current sensor or wiring issues.
What to do
Contact installer for inspection.
9warningCall your installer
Manual (PDF)
Master Phase1 Voltage High
Likely cause
Overvoltage condition on phase 1.
What to do
Check phase voltage; contact installer if persists.

What it costs in Perth

$57,960

Typical installed price, before rebates

WA Battery Scheme: Depends on your inverter
Federal STCs: −$6,943
You’d pay about: $51,017

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

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.

The federal rebate shrinks each year

STC value for this 64.4 kWh battery

How it compares

The SAJ CHS2-29.9K-T4-256.0V/280Ah/64.4kWh (AS4777-2 2020) against the closest-sized batteries from other brands.

Specification	SAJ CHS2-29.9K-T4-256.0V/280Ah/64.4kWh (AS4777-2 2020)SAJ	ZYC Energy SIMPO HV Pro64.5ZYC Energy	KSTAR BC63DE2-AUKSTAR

Usable capacity?	64.4 kWh	64.5 kWh	64.512 kWhbest value
Continuous power?	Not verified	Not verified	Not verified
Peak power?	Not verified	Not verified	Not verified

Round-trip efficiency?	92%	92%	92%
Warranty	10 years	10 years	10 years
Chemistry	LFP	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 (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

View all SAJ inverters

View full SAJ manufacturer profile

Want to take the next step?

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 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.