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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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CEC approved: July 2024Report outdated info

KOYOE KY-408V40AH

Name: KOYOE KY-408V40AH
Brand: KOYOE

FY series

CEC Approved

View datasheet (PDF)

Part of FY — see all configurations

Usable capacity: 13.11 kWh
Round-trip efficiency: 92%
Warranty: 15 yr
Chemistry: LFP

Full specifications

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.

Capacity & power

Nominal capacity: 16.38 kWh
Usable capacity: 13.11 kWh

Lifespan & degradation

Capacity retained at year 10: 87.4%
Warranted throughput: 400 MWh

Physical

IP rating: IP65

Operating environment

Operating temperature: -25°C to 60°C

Resources

Datasheet Installation guide

Warranty and support

Warranty terms and Australian support structure.

Duration

years

Throughput

400

MWh

Max Temp

60°

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 60°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: -25°C to 60°C

✓ TransferablePro-rata≥87.4% capacity at year 10

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) for full eligibility, 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. 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 KOYOE

View Full Profile →

Years in AU Market2+ years

Local SupportNot verified

CEC-Listed Products6 models

2yr AU

CEC-approved products since 2024

2 years in the Australian market

Fault & error codes — KOYOE FY

Extracted from the installation manual

13 documented

Showing 13 of 13. The official install manual is the authoritative source — always confirm before acting.

Battery Over Temperature FaultcriticalCall your installer
Manual (PDF)
Battery temperature exceeds safe ranges
Likely cause
Battery placed in high temperature area
What to do
Allow battery to cool; check placement for excessive heat exposure.
Battery Voltage Low FaultcriticalCall your installer
Manual (PDF)
Voltage of the battery pack is below threshold
Likely cause
Battery connection error or faulty battery
What to do
Verify battery connections and functionality; restart the inverter if corrected.
Bus Voltage HighcriticalCall your installer
Manual (PDF)
Internal bus voltage exceeds limits
Likely cause
PV input voltage exceeds 550V
What to do
Lower PV input voltage; contact support if error persists.
GFCI FaultcriticalCall your installer
Manual (PDF)
Ground Fault Circuit Interrupter fault due to high grounding current
Likely cause
Grounding current is too high
What to do
Check grounding connections; restart after resolving the issue.
Inverter Module Over Temperature FaultcriticalCall your installer
Manual (PDF)
Temperature of inverter module is high
Likely cause
Blocked heat sink or high ambient temperature
What to do
Ensure adequate ventilation; allow the inverter to cool before resuming operation.
Isolation FaultcriticalCall your installer
Manual (PDF)
Fault in inverter isolation; potential grounding issue
Likely cause
Improper grounding or connection
What to do
Check ground connections and impedance; ensure effective earthing of inverter.
Off Grid Over Voltage FaultcriticalCall your installer
Manual (PDF)
Excessive voltage from off-grid output
Likely cause
Improper connection or load issue
What to do
Check off-grid connections and load; ensure functioning of off-grid equipment.
PV Overvoltage FaultcriticalCall your installer
Manual (PDF)
PV input voltage exceeds allowable maximum
Likely cause
Voltage exceeds 550V
What to do
Verify and reduce PV input voltage below 550V.
BMS Communication Faultwarning
Manual (PDF)
Communication failure between the battery pack and the inverter
Likely cause
Unreliable connection or faulty cable
What to do
Check communication cable; restart the inverter after replacing the cable.
Grid Frequency Faultwarning
Manual (PDF)
Grid frequency is out of acceptable range
Likely cause
Frequency too low or too high
What to do
Check grid frequency levels; restart inverter when grid frequency normalizes.
Grid Voltage Faultwarning
Manual (PDF)
Grid voltage is out of acceptable range
Likely cause
Voltage too low or too high
What to do
Check grid voltage levels; restart inverter when grid voltage normalizes.
Low Ambient Temperature Warnwarning
Manual (PDF)
Ambient temperature is too low for operations
Likely cause
Surrounding environment below operational norms
What to do
Wait for ambient temperature to rise before resuming operation.
SPI Communication FaultwarningCall your installer
Manual (PDF)
Master-slave DSP communication failure
Likely cause
Communication failure between DSP units
What to do
Restart the inverter; if unresolved, contact customer service.

Perth pricing

Typical installed price

$11,799

WA State RebateSubject to eligibility

Federal STCs-$3,551

After Rebates~$8,248

Prices are estimates. Final pricing depends on installation requirements. STC value is based on the current certificate price of about $39.9.

The WA Battery Scheme rebate (up to $1,300) requires a Synergy-approved (SSL) inverter and VPP enrolment — not all systems qualify, so it is not included above. Confirm eligibility with your installer.

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Insufficient Data for Scoring

3 of 5 critical specs available (need 4)

Part of the KOYOE FY

See all configurations in this series →

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How it compares

The KOYOE KY-408V40AH against the closest-sized batteries from other brands.

Specification	KOYOE KY-408V40AHKOYOE	GoodWe LX F13.1-HGoodWe	Stealth Energy SP-HE51227-PStealth Energy

Usable capacity?	13.11 kWh	13.1 kWh	13.129 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	15 yearsbest value	10 years	10 years
Chemistry	LFP	LFP	LFP

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

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