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Home battery · BYD · BATTERY-BOX HVB series · CEC approved June 2026

BYD HVB 20.7

A 20.79 kWh home battery. Medium home size, the 20 to 30 kWh band.

Installed in Perth, after rebates: ~$11,632Estimate: 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: 20.79kWh
Warranty: 5yrs

HVB 20.7: the short answer

In the BATTERY-BOX HVB seriesOne of 9 sizes, from 5.94 to 29.69 kWh: 20.79kWhOne of 9 sizes, from 5.94 to 29.69 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 most of a home, but not everything at full tilt: 7.65kWRuns most of a home, but not everything at full tilt

Other sizes in the BATTERY-BOX HVB series

What we can tell you

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

20.79 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: 20.79kWh; How much energy it stores for you to use
Continuous power: 7.65kW; How much it can run at once: most of a home, but not everything at full tilt
Round-trip efficiency: 96%; How much of the energy you store comes back out
Depth of discharge: 90%; How much of the battery you can actually use
Warranty: 5yr; 60% of capacity guaranteed at the end of it
Battery chemistry: LFP; Lithium iron phosphate, the long-cycle-life type

Warranty and support

This warranty covers defects for 5 years and retains 60% capacity for 7 years. It voids if improperly installed or exposed to extreme temperatures. Claims can be made through BYD Partner.

Product: 5 years; not transferable; full replacement
At year 10: At least 60% of capacity
Throughput: 14.85 MWh
Installation: Must be installed by an SAA-accredited installer
Support: Australian officeBYD Australia; 10 years in the Australian market. Direct manufacturer warranty through Australian subsidiary.
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 BYD BATTERY-BOX HVB, by section.

Cell & chemistry

Chemistry: LFP

Capacity & power

Continuous power: 7.65 kW
Round-trip efficiency: 96%

Lifespan & degradation

Capacity retained at year 10: 60%
Warranted throughput: 14.85 MWh

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

Top clearance: 12 mm
Side clearance: 19 mm
Front clearance: 19 mm
AC breaker: 40 A
Cable gauge: 10 mm²
Earthing method: Not specified
DNSP pre-approval: No
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

Fault & error codes — BYD BATTERY-BOX HVB

Extracted from the installation manual

14 documented

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

11criticalCall your installer
Manual (PDF)
BMS and BMU communication failure
Likely cause
Communication issue between Battery Management System and Battery Management Unit
What to do
Contact your installer to check communication configurations.
12criticalCall your installer
Manual (PDF)
Inverter communication failure
Likely cause
Inability to establish a communication link with the inverter
What to do
Inspect the connection to the inverter; contact installer if issue persists.
14criticalCall your installer
Manual (PDF)
System initiating failed
Likely cause
The system was unable to start up properly
What to do
Contact your installer for diagnosis and possible reset.
2criticalCall your installer
Manual (PDF)
Precharge transistor or relay failure
Likely cause
Failure in the precharge circuit during system initialization
What to do
Contact installer for further diagnosis and repairs.
5criticalCall your installer
Manual (PDF)
BCU voltage sensor faulty
Likely cause
Issue with the BCU voltage sensing circuit
What to do
Contact your installer to replace or check the BCU.
6criticalCall your installer
Manual (PDF)
Current sensor failure
Likely cause
Problem with current sensing circuit
What to do
Contact installer for immediate action.
8criticalCall your installer
Manual (PDF)
Precharge failed
Likely cause
Failure in the precharge process of the battery system
What to do
Contact the installer to diagnose the precharge circuit.
1warning
Manual (PDF)
DC cable connection incorrect
Likely cause
Improper connection of the DC cables to the battery system
What to do
Check the DC cable connections and ensure they are properly connected.
13warning
Manual (PDF)
Address registration failed
Likely cause
Failure during address registration process in the system
What to do
Check for address configuration; contact installer if unclear.
3warning
Manual (PDF)
BIC (battery information collector) communication failed
Likely cause
Communication error between the battery and BIC
What to do
Ensure the cables are connected correctly and the BIC is functioning properly.
4warning
Manual (PDF)
Battery sensor failure
Likely cause
Faulty sensor or connectivity issue
What to do
Check the battery connections; if the problem persists, contact the installer.
7warning
Manual (PDF)
Cell data abnormal
Likely cause
Inconsistent data from battery cells
What to do
Monitor the system for further errors; contact installer if issues occur.
9warning
Manual (PDF)
BIC balancing failed
Likely cause
Balancing issue detected in the BIC
What to do
Check BIC and battery balancing status; contact installer if necessary.
10info
Manual (PDF)
Reserved
Likely cause
N/A
What to do
No action required.

About BYD

Years in the Australian market: 10+ (CEC-approved products since 2016)
Local support: Not verified
CEC-listed products: 45 models

View full profile →

What it costs in Perth

$16,500

Typical installed price, before rebates

WA Battery Scheme: Depends on your inverter
Federal STCs: −$4,868
You’d pay about: $11,632

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 20.79 kWh battery

How it compares

The BYD HVB 20.7 against the closest-sized batteries from other brands.

Specification	BYD HVB 20.7BYD	Sigenergy SigenStor-10T-21Sigenergy	Sigenergy SigenStor-10T-EV12-21Sigenergy

Usable capacity?	20.79 kWh	20.8 kWhbest value	20.8 kWhbest value
Continuous power?	7.65 kW	Not verified	Not verified
Peak power?	Not verified	Not verified	Not verified

Round-trip efficiency?	96%best value	92%	92%
Warranty	5 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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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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