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Home battery · Deye · CEC approved March 2026

Deye BOS-B140

A 128.7 kWh home battery. Very big home size, the 40+ kWh band.

WA Battery Scheme rebate: Depends on your inverterThe battery needs to pair with an inverter on Synergy's list; we don't know your inverter
Usable capacity: 128.7kWh
Warranty: 10yrs

Datasheet (PDF)

BOS-B140: the short answer

WA Battery SchemeThe battery needs to pair with an inverter on Synergy's list; we don't know your inverter: ConditionalThe battery needs to pair with an inverter on Synergy's list; we don't know your inverter

What we can tell you

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

128.7 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.

Key specs, in plain terms

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

Usable capacity: 128.7kWh; How much energy it stores for you to use
Continuous power: Not on file: we don't have this figure from the manufacturer's documents yet; How much it can run at once
Round-trip efficiency: 99%; How much of the energy you store comes back out
Depth of discharge: 90%; How much of the battery you can actually use
Warranty: 10yr; 70% of capacity guaranteed at the end of it
Battery chemistry: LFP; Lithium iron phosphate, the long-cycle-life type

Not on file: we don’t have this figure from the manufacturer’s documents yet, so we leave it blank rather than print a typical value. Ask your installer to confirm it on the quote. Seen it in a document? Tell us

Warranty and support

The battery is covered for 10 years against defects, ensuring at least 70% capacity retention. Warranty voids include improper installation and failure to operate within specified temperatures. Claims can be made by reporting to DEYE ESS with necessary details.

Product: 10 years; not transferable; full replacement
At year 10: At least 70% of capacity
Throughput: 32 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.

Warranty document Datasheet Compare warranties

WA Battery Scheme eligibility

Conditional

Whether this battery pairs with an inverter on Synergy's list, whether it can join a VPP, and whether it qualifies for the state rebate. Rebate and STC amounts are shown in the pricing panel.

This battery is AC-coupled. To get the WA rebate, the interest-free loan, VPP payments or DEBS export credits, it needs a gateway device from Synergy's approved list (for example SMA or Redback), or an inverter and battery from the same brand (Sungrow or Fronius). Without one, exports are capped at 1.5kW.

Some third-party gateways struggle to pass compliance testing, and adding anything to an AC-coupled system later means the whole system has to be re-checked. For many homes, switching to a hybrid (DC-coupled) inverter is the simpler path. AC vs DC coupling

CSIP-AUS compliant: Inverter must be CSIP-AUS compliant under the current WA framework.
VPP activation ready: Needs to pair with an inverter on Synergy's list.
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 Deye BOS-B, by section.

Cell & chemistry

Chemistry: LFP

Capacity & power

Depth of discharge: 90%
Round-trip efficiency: 98.5%

Lifespan & degradation

Capacity retained at year 10: 70%
Warranted throughput: 32 MWh

Physical

IP rating: IP65

Installation requirements

Top clearance: 5 mm
Side clearance: 100 mm
Front clearance: 100 mm
AC breaker: 160 A
Cable gauge: 4 mm²
Earthing method: TN-S
DNSP pre-approval: Yes
Estimated install time: 12 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 — Deye BOS-B

Extracted from the installation manual

59 documented

Showing 59 of 59. The official install manual is the authoritative source — always confirm before acting.

F001criticalCall your installer
Manual (PDF)
Excessive total pressure
Likely cause
Total voltage exceeds maximum limit
What to do
Check battery voltage levels and disconnect if necessary
F009criticalCall your installer
Manual (PDF)
Cell overvoltage
Likely cause
Single cell voltage exceeds safe limit
What to do
Stop charging and check cells
F012criticalCall your installer
Manual (PDF)
The temperature of the BMS connector is too high
Likely cause
Overheating at the connector, indicating possible failure
What to do
Disconnect power and allow to cool
F013criticalCall your installer
Manual (PDF)
The BMU connector temperature is too high
Likely cause
Overheating at BMU connector due to high current
What to do
Disconnect the system and check connections
F014criticalCall your installer
Manual (PDF)
Charging current fault
Likely cause
Abnormal charging current detected
What to do
Stop charging and check connections
F015criticalCall your installer
Manual (PDF)
Discharge current fault
Likely cause
Abnormal discharge current detected
What to do
Stop discharging and check connections
F016criticalCall your installer
Manual (PDF)
High SOC fault
Likely cause
State of Charge exceeds safe limit
What to do
Stop charging immediately
F017criticalCall your installer
Manual (PDF)
Insulation fault
Likely cause
Insulation breakdown detected
What to do
Disconnect power and inspect insulation
F020critical
Manual (PDF)
The total voltage is too low
Likely cause
Total voltage of the system is below minimum
What to do
Recharge the battery system
F021criticalCall your installer
Manual (PDF)
Total positive relay bonding
Likely cause
Relay stuck in ON position
What to do
Check relay function and disconnect power
F022criticalCall your installer
Manual (PDF)
The charging relay is glued
Likely cause
Relay malfunction causing it to stick
What to do
Inspect and possibly replace relay
F023criticalCall your installer
Manual (PDF)
The heating relay is glued
Likely cause
Relay malfunction causing it to stick
What to do
Inspect and possibly replace heating relay
F024criticalCall your installer
Manual (PDF)
Ultimate protection triggered
Likely cause
Safety mechanism activated due to multiple failures
What to do
Disconnect system and seek professional assistance
F026criticalCall your installer
Manual (PDF)
Blown fuse
Likely cause
Fuse has blown due to overload
What to do
Replace blown fuse and check system
F027criticalCall your installer
Manual (PDF)
The BMU repeatedly fails
Likely cause
BMU has malfunctioned multiple times
What to do
Inspect the BMU for errors
F028criticalCall your installer
Manual (PDF)
The BMS is faulty repeatedly
Likely cause
BMS has malfunctioned multiple times
What to do
Inspect the BMS for errors
F029criticalCall your installer
Manual (PDF)
The internal CAN communication fails
Likely cause
CAN bus communication error within system
What to do
Check wiring and connections on CAN bus
F030criticalCall your installer
Manual (PDF)
The PCS CAN communication fails
Likely cause
No response from PCS on CAN bus
What to do
Check PCS and connections to system
F031criticalCall your installer
Manual (PDF)
The PCS RS485 communication fails
Likely cause
Loss of RS485 communication with PCS
What to do
Check RS485 connections and devices
F037criticalCall your installer
Manual (PDF)
Voltage collection fault
Likely cause
Sensor failure or connection issue
What to do
Check sensors and wiring
F038criticalCall your installer
Manual (PDF)
Temperature acquisition fault
Likely cause
Temperature sensor failure or issue
What to do
Inspect temperature sensors and wiring
F039criticalCall your installer
Manual (PDF)
Current acquisition fault
Likely cause
Current sensor failure or issue
What to do
Inspect current sensors and wiring
F040criticalCall your installer
Manual (PDF)
Current module fault
Likely cause
Hall current sensor reference failure
What to do
Inspect module for faults
F041criticalCall your installer
Manual (PDF)
Total positive relay drive failure
Likely cause
Relay mechanism is defective
What to do
Check and replace as needed
F042criticalCall your installer
Manual (PDF)
Charging relay drive failure
Likely cause
Relay mechanism is defective
What to do
Check and replace as needed
F043criticalCall your installer
Manual (PDF)
Discharge relay drive failure
Likely cause
Relay mechanism is defective
What to do
Check and replace as needed
F044criticalCall your installer
Manual (PDF)
Heating relay drive failure
Likely cause
Relay mechanism is defective
What to do
Check and replace as needed
F045criticalCall your installer
Manual (PDF)
The EEPROM storage is faulty
Likely cause
Error in EEPROM writes during self-test
What to do
Check EEPROM function
F046criticalCall your installer
Manual (PDF)
The precharge failed
Likely cause
Precharge circuit malfunction
What to do
Inspect precharge circuit and components
F048criticalCall your installer
Manual (PDF)
The BMU communication is faulty
Likely cause
Communication error with BMU
What to do
Inspect BMU communication wiring
F049criticalCall your installer
Manual (PDF)
The number of BMUs is abnormal
Likely cause
Mismatch in expected vs actual BMUs present
What to do
Verify system configuration and components
F052criticalCall your installer
Manual (PDF)
PACK thermal runaway fault
Likely cause
Thermal runaway condition detected in battery pack
What to do
Immediately disconnect power and cool down
F053criticalCall your installer
Manual (PDF)
PACK fire failure
Likely cause
Fire condition detected in battery pack
What to do
Disconnect power and use appropriate fire suppression
F056criticalCall your installer
Manual (PDF)
LC communication loss
Likely cause
Loss of connection to Logic Controller
What to do
Check LC connections
F057criticalCall your installer
Manual (PDF)
BMU AFE communication fails
Likely cause
Failure in communication to Active Front End
What to do
Inspect AFE connections
F002warning
Manual (PDF)
The total pressure is too low
Likely cause
Total voltage below minimum limit
What to do
Recharge the battery system
F003warningCall your installer
Manual (PDF)
Charging temperature is too high
Likely cause
Ambient temperature is above safe charging levels
What to do
Cool down the system before charging
F004warningCall your installer
Manual (PDF)
High discharge temperature
Likely cause
Excessive heat during discharge
What to do
Allow system to cool before use
F005warningCall your installer
Manual (PDF)
The charging temperature is too low
Likely cause
Temperature below safe limits for charging
What to do
Warm up the system before charging
F006warningCall your installer
Manual (PDF)
The discharge temperature is too low
Likely cause
Temperature below safe limits for discharging
What to do
Avoid discharging until warmed up
F007warningCall your installer
Manual (PDF)
Excessive differential pressure
Likely cause
Voltage difference between cells exceeds limits
What to do
Check individual cell voltages
F008warningCall your installer
Manual (PDF)
Excessive temperature differentials
Likely cause
Temperature difference between cells exceeds limits
What to do
Monitor temperature distribution
F010warning
Manual (PDF)
Cell undervoltage
Likely cause
Single cell voltage below safe limit
What to do
Recharge the battery system
F011warningCall your installer
Manual (PDF)
The temperature of the precharge resistance is too high
Likely cause
Overheating of precharge resistors
What to do
Allow to cool and inspect connections
F018warningCall your installer
Manual (PDF)
The heating film is too high
Likely cause
Overheating in heating film
What to do
Allow to cool and inspect heating elements
F019warning
Manual (PDF)
The SOC is too low
Likely cause
State of Charge is below acceptable limit
What to do
Recharge the battery system
F025warning
Manual (PDF)
Abnormal supply voltage
Likely cause
Voltage supplied to system is outside expected range
What to do
Check power supply and reconnect
F032warningCall your installer
Manual (PDF)
The PCS RS485 communication is abnormal
Likely cause
Abnormal signals detected on RS485
What to do
Inspect wiring for damage or malfunctions
F033warningCall your installer
Manual (PDF)
The FUSE total pressure collection is abnormal
Likely cause
Inaccurate reading from voltage collection
What to do
Check voltages and replace FUSE if necessary
F034warningCall your installer
Manual (PDF)
Abnormal internal total pressure collection
Likely cause
Internal measurements fail to correlate
What to do
Inspect internal components for faults
F035warningCall your installer
Manual (PDF)
The Mot total pressure collection is abnormal
Likely cause
Abnormal voltage readings detected
What to do
Check motor connections and functions
F036warningCall your installer
Manual (PDF)
The heating total pressure collection is abnormal
Likely cause
Inaccurate heating measurements
What to do
Inspect heating components for issues
F047warning
Manual (PDF)
The charging voltage is too low
Likely cause
Insufficient voltage supplied to charge
What to do
Check power supply to charging circuit
F050warningCall your installer
Manual (PDF)
Temperature collection of the BMS connector is abnormal
Likely cause
Sensor or connection errors
What to do
Check connections and component function
F051warningCall your installer
Manual (PDF)
The temperature collection of the BMU connector is abnormal
Likely cause
Sensor or connection errors
What to do
Check connections and component function
F054warning
Manual (PDF)
TCP connection failure
Likely cause
Network connection issue
What to do
Check network connections
F055warningCall your installer
Manual (PDF)
The W5500SPI communication fails
Likely cause
Breakdown in SPI communication
What to do
Inspect SPI connections
F058warning
Manual (PDF)
Bluetooth initialization failed
Likely cause
Error during Bluetooth setup
What to do
Restart system and attempt Bluetooth connection again
F059warning
Manual (PDF)
The battery type does not match
Likely cause
Mismatch between battery type and configuration
What to do
Verify battery type and settings

About Deye

Years in the Australian market: 6+ (CEC-approved products since 2020)
Local support: Not verified
CEC-listed products: 53 models

View full profile →

What it costs in Perth

We price batteries by size rather than by model. The average installed price before rebates:

10 kWh: $7,000–$9,000
20 kWh: $10,000–$15,000

Solar Battery Perth’s estimate, Oct 2026. Other sizes are not priced here, and a quote prices this model.

Rebates on this battery

WA Battery Scheme: Depends on your inverter
Federal STCs: −$6,943

The WA Battery Scheme (up to $1,300) needs VPP enrolment, and the battery needs to pair with an inverter on Synergy's list. We don't know which inverter you'd pair this with, so we can't say whether it applies. Ask your installer. STCs assume about $39.9 a certificate.

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 very big 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 128.7 kWh battery

How it compares

The Deye BOS-B140 against the closest-sized batteries from other brands.

Specification	Deye BOS-B140Deye	Sigenergy SigenStack M2-0.5C-BST-11/132.63 kWhSigenergy	Sigenergy SigenStack M2-1C-BST-11/132.63 kWhSigenergy

Usable capacity?	128.7 kWh	128.7 kWh	128.7 kWh
Continuous power?	Not verified	Not verified	Not verified
Peak power?	Not verified	Not verified	Not verified

Round-trip efficiency?	99%	Not verified	Not verified
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.

More from Deye

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View full Deye 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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