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Battery inverter · FoxESS · KA series · CEC approved June 2025

FoxESS KA9.9

CEC listing: KA9.9 (AS4777-2 2020)

A 9.9 kW single-phase battery inverter.

Installed in Perth, typical: ~$4,208; Estimate for the inverter alone — your quote will vary
Rated power: 9.9kW; How much solar it can run at once
Battery-ready: Yes; Battery inverter: it runs the battery, alongside your solar inverter

Datasheet (PDF)Compare inverters See the whole KA series

What we can tell you

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

It is a battery inverter: it runs a battery, and pairs with a separate solar inverter.
It runs on a standard single-phase supply.
We can't confirm it is on Synergy's approved list — a battery paired with it needs that for the WA Battery Scheme, so ask your installer.
It is CEC-approved, which a new install needs to qualify for STCs.

Key specs, in plain terms

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

Rated power How much solar it can turn into usable power at once: 9.9kW
Phases Runs on a standard single-phase supply: Single
Type Runs a battery; pairs with a separate solar inverter: Battery
Warranty How long FOXESS CO LTD stands behind it: 10yr

Full datasheet

Every figure on file for the FoxESS KA9.9, by section.

Full datasheet, by section
Specification	Value
Physical
IP rating	IP65
Installation requirements
Top clearance	500 mm
Side clearance	500 mm
AC breaker	63 A
Cable gauge	10 mm²
Earthing method	TN-S
DNSP pre-approval	No
Estimated install time	8 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.

Features & compatibility

Battery compatible

Yes

Backup capable

Yes

CEC approval details

CEC approved

13 June 2025

Approval expiry

13 June 2028

Status

Active

Eligible for rebates

Yes

About FOXESS CO LTD

Years in AU Market

7 years

Australian Office

Yes

CEC-Approved Batteries

116

CEC-Approved Panels

What it costs in Perth

Typical installed, inverter only

$2,970–$5,445

Estimate confidence: Medium

Prices vary by installer, configuration and site complexity. Get exact quotes from installers you choose.

Explore your options

Compare quotes from installers you choose

WA compliance

Synergy approved list: Not confirmed
ESM compliant: Check

Western Power approval is required for every grid-connected install. Under Emergency Solar Management, a new system must be remotely manageable, or take an export limit instead — ask your installer to confirm this inverter’s ESM status.

Perth performance

Estimate for a full-size array on this inverter

Daily yield: 42.1 kWh
Annual yield: 15,357 kWh

At 5 peak sun hours a day (BOM) with a 15% system derate.

Australian office

Has local presence

Website

au.fox-ess.com

7 years in Australian market

How it compares

The FoxESS KA9.9 against the closest-power inverters from other brands.

Specification	FoxESS KA9.9FoxESS	Energizer Force 9.9HS+Energizer	Energizer Force 9.9HT+Energizer

Rated power?	9.9 kW	9.9 kW	9.9 kW
Max efficiency?	0.0%	0.0%	0.0%
MPPT trackers?	Not verified	Not verified	Not verified

Phases	Single-phase	Single-phase	Three-phase
Type	Battery	Hybrid	Hybrid
Battery ready	Yes	Yes	Yes
Warranty	10 years	Not verified	Not verified

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

Documents

10-year inverter warranty

FoxESS KA9.9

The warranty covers parts for 10 years. It excludes damages from improper installation. To claim, contact customer support.

AI-summarised from the manufacturer warranty document. Always confirm against the linked PDF before relying on it for a claim.

Coverage shape: Pro-rata — value reduces with age
If you sell the home: Transfers to the next homeowner
What voids it: Non-accredited installation, unauthorized modifications, or tampering.
Environment limits: None stated.

Read the official warranty document (PDF)

Fault & error codes — FoxESS KA9.9

From the install manual

19 documented

Showing 19 of 19. The official install manual is the authoritative source — always confirm before acting.

Ground FaultcriticalCall your installer
Manual (PDF)
The ground connection is failed.
Likely cause
Faulty wiring or poor connection to ground.
What to do
Check the voltage of neutral and PE. Check AC wiring. Disconnect PV, grid, and battery, then reconnect.
Iso FaultcriticalCall your installer
Manual (PDF)
The isolation is failed.
Likely cause
Damaged electrical wiring or components.
What to do
Please check if the insulation of electric wires is damaged. Wait to check if back to normal, or seek help.
Res Cur FaultcriticalCall your installer
Manual (PDF)
The residual current is high.
Likely cause
Possible earth leak or faulty insulation.
What to do
Please check if the insulation of electric wires is damaged. Wait to check if back to normal, or seek help.
10min Volt Faultwarning
Manual (PDF)
The grid voltage is out of range for the last 10 minutes.
Likely cause
Long-term voltage instability from the utility.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
Bat Power Lowwarning
Manual (PDF)
The battery power is low.
Likely cause
Battery discharge too far or not charging.
What to do
Wait for the battery to be recharged. Or seek help.
Bat Volt Faultwarning
Manual (PDF)
Battery voltage fault.
Likely cause
Battery may be overcharged or discharged.
What to do
Check if the battery input voltage is within the normal range. Or seek help.
DCI Faultwarning
Manual (PDF)
DC component is out of limit in output current.
Likely cause
Faulty wiring or components.
What to do
Disconnect PV, grid, and battery, then reconnect.
Eps Over Loadwarning
Manual (PDF)
Over load in off-grid mode.
Likely cause
Connected load exceeds EPS capacity.
What to do
Please check if the eps load power exceeds the limit. Or seek help.
Grid Freq Faultwarning
Manual (PDF)
Grid frequency out of range.
Likely cause
Utility power frequency fluctuation.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
Grid Lost Faultwarning
Manual (PDF)
Grid is lost.
Likely cause
Utility power is out.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
Grid Volt Faultwarning
Manual (PDF)
Grid voltage out of range.
Likely cause
Utility power voltage fluctuation.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
HW Inv Cur Faultwarning
Manual (PDF)
Output current high detected by hardware.
Likely cause
Possible overload or short circuit.
What to do
Disconnect PV, grid, and battery, then reconnect.
Over Load Faultwarning
Manual (PDF)
Over load in on-grid mode.
Likely cause
Connected load exceeds inverter capacity.
What to do
Please check if the load power exceeds the limit. Or seek help.
Pv Volt Faultwarning
Manual (PDF)
PV voltage out of range.
Likely cause
Faulty PV module or incorrect installation.
What to do
Please check the output voltage of PV panels. Or seek help.
SW Bat Cur Faultwarning
Manual (PDF)
Battery current high detected by software.
Likely cause
Faulty battery or wiring issue.
What to do
Disconnect PV, grid, and battery, then reconnect.
SW Bus Vol Faultwarning
Manual (PDF)
Bus voltage out of range detected by software.
Likely cause
Faulty system voltage or capacitor issue.
What to do
Disconnect PV, grid, and battery, then reconnect.
SW Inv Cur Faultwarning
Manual (PDF)
Output current high detected by software.
Likely cause
Possible overload or short circuit.
What to do
Disconnect PV, grid, and battery, then reconnect.
SW Pv Cur Faultwarning
Manual (PDF)
PV input current high detected by software.
Likely cause
Faulty PV module or short circuit.
What to do
Disconnect PV, grid, and battery, then reconnect.
Temp Faultwarning
Manual (PDF)
The inverter temperature is high.
Likely cause
Insufficient ventilation or overheating conditions.
What to do
Please check if the environment temperature is suitable. Wait to check if back to normal, or seek help.

Part of the FoxESS KA series

Compare every FoxESS KA variant side by side →

More FOXESS CO LTD Inverters

1K5-1P-HI-10.5 (AS4777-2 2020)

10.5 kW · 1φ

1K5-1P-HI-10 (AS4777-2 2020)

10 kW · 1φ

1K5-1P-HI-3.7 (AS4777-2 2020)

3.68 kW · 1φ

1K5-1P-HI-4.6 (AS4777-2 2020)

4.6 kW · 1φ

1K5-1P-HI-5 (AS4777-2 2020)

5 kW · 1φ

1K5-1P-HI-6 (AS4777-2 2020)

6 kW · 1φ

View all FOXESS CO LTD inverters

More from FOXESS CO LTD

Other CEC-approved products from FOXESS CO LTD available in Australia.

FOXESS CO LTD Batteries

1K5-BAT-4660-L2

9.32 kWh · LFP

1K5-BAT-4660-L3

13.98 kWh · LFP

1K5-BAT-4660-L4

18.64 kWh · LFP

1K5-BAT-4660-L5

23.3 kWh · LFP

1K5-BAT-4660-L6

27.96 kWh · LFP

1K5-BAT-4660-L7

32.61 kWh · LFP

View all FOXESS CO LTD batteries

View full FOXESS CO LTD manufacturer profile

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Get a quote from an installer from our network that covers your area. You choose whether to act on it. No obligation.

About this data

All inverter specifications are sourced from the CEC Approved Products Register. Specifications are provided as published by the CEC and may differ from manufacturer datasheets. Verify current specifications with the manufacturer or your installer before purchasing. Not all listed models may be currently available in Western Australia.

Battery inverter · FoxESS · KA series · CEC approved June 2025

FoxESS KA9.9

CEC listing: KA9.9 (AS4777-2 2020)

A 9.9 kW single-phase battery inverter.

Installed in Perth, typical: ~$4,208; Estimate for the inverter alone — your quote will vary
Rated power: 9.9kW; How much solar it can run at once
Battery-ready: Yes; Battery inverter: it runs the battery, alongside your solar inverter

Datasheet (PDF)Compare inverters See the whole KA series

Spotted something outdated?

What we can tell you

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

It is a battery inverter: it runs a battery, and pairs with a separate solar inverter.
It runs on a standard single-phase supply.
We can't confirm it is on Synergy's approved list — a battery paired with it needs that for the WA Battery Scheme, so ask your installer.
It is CEC-approved, which a new install needs to qualify for STCs.

Key specs, in plain terms

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

Rated power How much solar it can turn into usable power at once: 9.9kW
Phases Runs on a standard single-phase supply: Single
Type Runs a battery; pairs with a separate solar inverter: Battery
Warranty How long FOXESS CO LTD stands behind it: 10yr

Full datasheet

Every figure on file for the FoxESS KA9.9, by section.

Full datasheet, by section
Specification	Value
Physical
IP rating	IP65
Installation requirements
Top clearance	500 mm
Side clearance	500 mm
AC breaker	63 A
Cable gauge	10 mm²
Earthing method	TN-S
DNSP pre-approval	No
Estimated install time	8 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.

Features & compatibility

Battery compatible

Yes

Backup capable

Yes

CEC approval details

CEC approved

13 June 2025

Approval expiry

13 June 2028

Status

Active

Eligible for rebates

Yes

About FOXESS CO LTD

Years in AU Market

7 years

Australian Office

Yes

CEC-Approved Batteries

116

CEC-Approved Panels

What it costs in Perth

Typical installed, inverter only

$2,970–$5,445

Estimate confidence: Medium

Prices vary by installer, configuration and site complexity. Get exact quotes from installers you choose.

Explore your options

Compare quotes from installers you choose

WA compliance

Synergy approved list: Not confirmed
ESM compliant: Check

Perth performance

Estimate for a full-size array on this inverter

Daily yield: 42.1 kWh
Annual yield: 15,357 kWh

At 5 peak sun hours a day (BOM) with a 15% system derate.

Australian office

Has local presence

Website

au.fox-ess.com

7 years in Australian market

How it compares

The FoxESS KA9.9 against the closest-power inverters from other brands.

Specification	FoxESS KA9.9FoxESS	Energizer Force 9.9HS+Energizer	Energizer Force 9.9HT+Energizer

Rated power?	9.9 kW	9.9 kW	9.9 kW
Max efficiency?	0.0%	0.0%	0.0%
MPPT trackers?	Not verified	Not verified	Not verified

Phases	Single-phase	Single-phase	Three-phase
Type	Battery	Hybrid	Hybrid
Battery ready	Yes	Yes	Yes
Warranty	10 years	Not verified	Not verified

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

Documents

10-year inverter warranty

FoxESS KA9.9

The warranty covers parts for 10 years. It excludes damages from improper installation. To claim, contact customer support.

AI-summarised from the manufacturer warranty document. Always confirm against the linked PDF before relying on it for a claim.

Coverage shape: Pro-rata — value reduces with age
If you sell the home: Transfers to the next homeowner
What voids it: Non-accredited installation, unauthorized modifications, or tampering.
Environment limits: None stated.

Read the official warranty document (PDF)

Fault & error codes — FoxESS KA9.9

From the install manual

19 documented

Showing 19 of 19. The official install manual is the authoritative source — always confirm before acting.

Ground FaultcriticalCall your installer
Manual (PDF)
The ground connection is failed.
Likely cause
Faulty wiring or poor connection to ground.
What to do
Check the voltage of neutral and PE. Check AC wiring. Disconnect PV, grid, and battery, then reconnect.
Iso FaultcriticalCall your installer
Manual (PDF)
The isolation is failed.
Likely cause
Damaged electrical wiring or components.
What to do
Please check if the insulation of electric wires is damaged. Wait to check if back to normal, or seek help.
Res Cur FaultcriticalCall your installer
Manual (PDF)
The residual current is high.
Likely cause
Possible earth leak or faulty insulation.
What to do
Please check if the insulation of electric wires is damaged. Wait to check if back to normal, or seek help.
10min Volt Faultwarning
Manual (PDF)
The grid voltage is out of range for the last 10 minutes.
Likely cause
Long-term voltage instability from the utility.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
Bat Power Lowwarning
Manual (PDF)
The battery power is low.
Likely cause
Battery discharge too far or not charging.
What to do
Wait for the battery to be recharged. Or seek help.
Bat Volt Faultwarning
Manual (PDF)
Battery voltage fault.
Likely cause
Battery may be overcharged or discharged.
What to do
Check if the battery input voltage is within the normal range. Or seek help.
DCI Faultwarning
Manual (PDF)
DC component is out of limit in output current.
Likely cause
Faulty wiring or components.
What to do
Disconnect PV, grid, and battery, then reconnect.
Eps Over Loadwarning
Manual (PDF)
Over load in off-grid mode.
Likely cause
Connected load exceeds EPS capacity.
What to do
Please check if the eps load power exceeds the limit. Or seek help.
Grid Freq Faultwarning
Manual (PDF)
Grid frequency out of range.
Likely cause
Utility power frequency fluctuation.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
Grid Lost Faultwarning
Manual (PDF)
Grid is lost.
Likely cause
Utility power is out.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
Grid Volt Faultwarning
Manual (PDF)
Grid voltage out of range.
Likely cause
Utility power voltage fluctuation.
What to do
System will reconnect if the utility is back to normal. Or seek help if not back to normal state.
HW Inv Cur Faultwarning
Manual (PDF)
Output current high detected by hardware.
Likely cause
Possible overload or short circuit.
What to do
Disconnect PV, grid, and battery, then reconnect.
Over Load Faultwarning
Manual (PDF)
Over load in on-grid mode.
Likely cause
Connected load exceeds inverter capacity.
What to do
Please check if the load power exceeds the limit. Or seek help.
Pv Volt Faultwarning
Manual (PDF)
PV voltage out of range.
Likely cause
Faulty PV module or incorrect installation.
What to do
Please check the output voltage of PV panels. Or seek help.
SW Bat Cur Faultwarning
Manual (PDF)
Battery current high detected by software.
Likely cause
Faulty battery or wiring issue.
What to do
Disconnect PV, grid, and battery, then reconnect.
SW Bus Vol Faultwarning
Manual (PDF)
Bus voltage out of range detected by software.
Likely cause
Faulty system voltage or capacitor issue.
What to do
Disconnect PV, grid, and battery, then reconnect.
SW Inv Cur Faultwarning
Manual (PDF)
Output current high detected by software.
Likely cause
Possible overload or short circuit.
What to do
Disconnect PV, grid, and battery, then reconnect.
SW Pv Cur Faultwarning
Manual (PDF)
PV input current high detected by software.
Likely cause
Faulty PV module or short circuit.
What to do
Disconnect PV, grid, and battery, then reconnect.
Temp Faultwarning
Manual (PDF)
The inverter temperature is high.
Likely cause
Insufficient ventilation or overheating conditions.
What to do
Please check if the environment temperature is suitable. Wait to check if back to normal, or seek help.

Part of the FoxESS KA series

Compare every FoxESS KA variant side by side →

More FOXESS CO LTD Inverters

1K5-1P-HI-10.5 (AS4777-2 2020)

10.5 kW · 1φ

1K5-1P-HI-10 (AS4777-2 2020)

10 kW · 1φ

1K5-1P-HI-3.7 (AS4777-2 2020)

3.68 kW · 1φ

1K5-1P-HI-4.6 (AS4777-2 2020)

4.6 kW · 1φ

1K5-1P-HI-5 (AS4777-2 2020)

5 kW · 1φ

1K5-1P-HI-6 (AS4777-2 2020)

6 kW · 1φ

View all FOXESS CO LTD inverters