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Home battery · BYD · CEC approved June 2025

BYD LV Flex

A 5 kWh home battery with backup power.

Installed in Perth, after rebates: ~$4,443; 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: 5kWh; Below the smaller-home band

Datasheet (PDF)See the whole Battery-Box series

What we can tell you

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

5 kWh is below the smaller-home band — this is one module of a larger stack.
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: 5kWh
Continuous power How much it can run at once — most of a home, but not everything at full tilt: 7.65kW
Round-trip efficiency How much of the energy you store comes back out: 96%
Depth of discharge You can use the whole battery, not just part of it: 100%
Warranty 60% 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 BYD Battery-Box, by section.

Full datasheet, by section
Specification	Value
Cell & chemistry
Chemistry	LFP
Cell type	LFP
Capacity & power
Nominal capacity	5 kWh
Usable capacity	5 kWh
Continuous power	7.65 kW
Peak power	5.4 kW
Depth of discharge	100%
Round-trip efficiency	96%
Nominal voltage	51.2 V
Lifespan & degradation
Capacity retained at year 10	60%
Warranted throughput	68.31 MWh
Modularity & stacking
Modular / stackable	Yes
Maximum stack	320 kWh
Backup & grid services
Backup capable	Yes
VPP ready	No
Physical
Dimensions (H×W×D)	585 × 712 × 298 mm
Weight	91 kg
IP rating	IP55
Operating environment
Operating temperature	-10°C to 50°C
Installation requirements
Cable gauge	10 mm²

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.

The BYD Battery-Box Premium is warranted for 10 years against defects and to retain at least 60% capacity, but not for damage due to unauthorized modifications. To claim, provide proof of ownership to BYD.

Duration

years

Throughput

68.31

MWh

Max Temp

50°

celsius

Max Backup

Level 0

No Backup

Australian support structure

Australian Office10 years in AU market

BYD Australia

Direct manufacturer warranty through Australian subsidiary.

Perth heat

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

Key warranty terms

•Depth of Discharge: 100% usable capacity
•Round-trip Efficiency: 96% rated
•Annual Degradation: ~2.5% per year expected
•Installation: Must be installed by SAA-accredited installer
•Operating Conditions: -10°C to 50°C

✓ TransferableFull replacement≥60% capacity at year 10

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

About BYD

View Full Profile →

Years in AU Market10+ years

Local SupportNot verified

CEC-Listed Products45 models

10yr AU

CEC-approved products since 2016

10 years in the Australian market

Fault & error codes — BYD Battery-Box

Extracted from the installation manual

14 documented

Showing 14 of 14. The official install manual is the authoritative source — always confirm before acting.

1criticalCall your installer
Manual (PDF)
DC cable connection incorrect
Likely cause
Incorrect connection of DC cables.
What to do
Check and correct the DC cable connections immediately.
11criticalCall your installer
Manual (PDF)
BMS and BMU communication failure
Likely cause
Communication between the Battery Management System and Unit has failed.
What to do
Contact an installer for assistance with troubleshooting this communication issue.
12criticalCall your installer
Manual (PDF)
Inverter communication failure
Likely cause
The inverter does not communicate properly with the energy storage system.
What to do
Check the inverter connections and settings. If needed, contact your installer.
13criticalCall your installer
Manual (PDF)
Address registration failed
Likely cause
Failure in registering the address of the system components.
What to do
Contact technical support for guidance on address configuration.
14criticalCall your installer
Manual (PDF)
System initiating failed
Likely cause
The system failed to initiate properly after startup.
What to do
Seek professional assistance for diagnosis and repair.
2criticalCall your installer
Manual (PDF)
Precharge transistor or relay failure
Likely cause
Failure in the precharge circuit.
What to do
Contact an installer for further assistance.
3criticalCall your installer
Manual (PDF)
BIC communication failed
Likely cause
Faulty communication with Battery Information Collector.
What to do
Check the communication setup. If error persists, contact an installer.
4criticalCall your installer
Manual (PDF)
Battery sensor failure
Likely cause
Malfunction in battery sensor hardware.
What to do
Seek assistance from an installer to check and replace the battery sensor.
5criticalCall your installer
Manual (PDF)
BCU voltage sensor faulty
Likely cause
Voltage sensor in Battery Control Unit is malfunctioning.
What to do
Contact a professional installer to inspect and rectify the issue.
6criticalCall your installer
Manual (PDF)
Current sensor failure
Likely cause
Fault in the current sensing equipment.
What to do
Immediate professional help is required to resolve the issue.
7criticalCall your installer
Manual (PDF)
Cell data abnormal
Likely cause
Abnormalities detected in battery cell data readings.
What to do
Contact your installer to evaluate the battery setup.
8criticalCall your installer
Manual (PDF)
Precharge failed
Likely cause
Failed precharging procedure.
What to do
Consult an installer for a detailed inspection and resolution.
9criticalCall your installer
Manual (PDF)
BIC balancing failed
Likely cause
Failed balancing operation on Battery Information Collector.
What to do
Request assistance from a qualified installer.
10info
Manual (PDF)
Reserved
Likely cause
Not applicable; reserved for future use.
What to do
No action required at this time.

What it costs in Perth

$5,800

Typical installed price, before rebates

WA Battery Scheme: Depends on your inverter
Federal STCs: −$1,357
You’d pay about: $4,443

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 below the smaller-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 5 kWh battery

How it compares

The BYD LV Flex against the closest-sized batteries from other brands.

Specification	BYD LV FlexBYD	Alpha ESS SMILE-M-BAT-5PAlpha ESS	Anker X1-B5-HAnker

Usable capacity?	5 kWh	5 kWh	5 kWh
Continuous power?	7.65 kW	Not verified	Not verified
Peak power?	5.4 kW	Not verified	Not verified

Round-trip efficiency?	96%best value	92%	92%
Warranty	10 years	Not verified	Not verified
Chemistry	LFP	LFP	LFP

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

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View full BYD 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.