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Hybrid inverter · Sofar · CEC approved October 2026

Sofar ESI-9.99K-S1-A

CEC listing: ESI-9.99K-S1-A (AS4777-2 2020)

A 10 kW single-phase hybrid inverter that is battery-ready.

Installed in Perth, estimated: ~$4,745Estimate, modelled from its size, Feb 2026 rates
Rated power: 10kWHow much solar it can run at once
Battery-ready: YesHybrid: a battery plugs straight in, no second box

Datasheet (PDF)

ESI-9.99K-S1-A: the short answer

Feed-in credits (DEBS)DEBS pays for exports only when the inverter is 5 kW or less: NoDEBS pays for exports only when the inverter is 5 kW or less

What we can tell you

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

It is a hybrid inverter: solar and a battery run from the one unit, so adding a battery later doesn't need a second box.
It runs on a standard single-phase supply.
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: 10kW; How much solar it can turn into usable power at once
Max efficiency: Not on file: we don't have this figure from the manufacturer's documents yet; How much of the solar you make reaches the house
Phases: Single; Runs on a standard single-phase supply
Type: Hybrid; Runs solar and a battery from one unit
Warranty: 10yr; How long Shenzhen SOFARSOLAR Co Ltd stands behind it

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

Full datasheet

Every figure on file for the Sofar ESI-9.99K-S1-A, by section.

Full datasheet, by section
Specification	Value
Physical
IP rating	IP66
Installation requirements
Top clearance	250 mm
Side clearance	100 mm
AC breaker	20 A
Cable gauge	10 mm²
Earthing method	TN-S
DNSP pre-approval	Yes
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 and CEC approval

Battery compatible: Yes
Backup capable: Yes
CEC approved: 13 Oct 2026
Approval expiry: 13 Oct 2029
Status: Active
Listed for STCs: Yes

About Sofar

Years in the Australian market: 8 years
Australian office: Not verified
Category: Mid-Tier
CEC-approved inverters: 120
CEC-approved batteries: 6

View full profile →

What it costs in Perth

Estimated installed, inverter only

$3,497–$5,994

Estimatemodelled from its sizeFeb 2026 rates

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

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: 42.5 kWh
Annual yield: 15,497 kWh

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

Website

www.sofarsolar.com

8 years in Australian market

How it compares

The Sofar ESI-9.99K-S1-A against the closest-power inverters from other brands.

Specification	Sofar ESI-9.99K-S1-ASofar	GoodWe GW9.99K-EHB-AU-G11GoodWe	GoodWe GW9.9KAU-DTGoodWe

Rated power?	9.99 kW	9.99 kW	9.99 kW
Max efficiency?	Not on file	Not on file	Not on file
MPPT trackers?	Not on file	Not on file	Not on file

Phases	Single-phase	Single-phase	Three-phase
Type	Hybrid	Hybrid	Solar
Battery ready	Yes	Yes	No
Warranty	10 years	Not on file	Not on file

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

Documents

10-year inverter warranty

Sofar ESI-9.99K-S1-A

The warranty covers performance deterioration for 10 years, with a maximum of 90% capacity after 10 years. Claims can be made through 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: Warranty voided if not installed by an accredited technician or if tampered with.
Environment limits: Coverage void in extreme temperatures above 60°C.

Read the official warranty document (PDF)

Fault & error codes — Sofar ESI-9.99K-S1-A

From the install manual

12 documented

Showing 12 of 12. The official install manual is the authoritative source — always confirm before acting.

ID001criticalCall your installer
Manual (PDF)
Grid overvoltage
Likely cause
The grid voltage is too high
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. If the grid voltage is out of range, contact SOFAR support to adjust protection points after obtaining approval from the local grid operator.
ID002criticalCall your installer
Manual (PDF)
Grid undervolt
Likely cause
The grid voltage is too low
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. Contact SOFAR support if the grid voltage is out of range.
ID003criticalCall your installer
Manual (PDF)
Grid overfreq
Likely cause
The grid frequency is too high
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. Contact SOFAR support if needed.
ID004criticalCall your installer
Manual (PDF)
Grid underfreq
Likely cause
The grid frequency is too low
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. Contact SOFAR support if needed.
ID005criticalCall your installer
Manual (PDF)
GFCI Fault
Likely cause
Charge Leakage Fault
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. If not resolved, contact SOFAR support.
ID008criticalCall your installer
Manual (PDF)
IslandFault
Likely cause
Island protection error
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. Contact SOFAR support if not resolved.
ID012criticalCall your installer
Manual (PDF)
InvOVP
Likely cause
Inverter voltage error
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. Contact SOFAR support if not resolved.
ID042criticalCall your installer
Manual (PDF)
IsoFault
Likely cause
Low insulation impedance
What to do
Check insulation resistance. Repair any short circuits. Contact SOFAR support if needed.
ID046criticalCall your installer
Manual (PDF)
Reversal Connect
Likely cause
Input reverse connection error
What to do
Check DC input connection for correctness.
ID067criticalCall your installer
Manual (PDF)
BusUVP
Likely cause
Bus undervoltage during grid connection
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. Contact SOFAR support if the problem is not solved.
ID059warningCall your installer
Manual (PDF)
TemFault Inv1
Likely cause
Module temperature protection
What to do
Ensure inverter is installed in a cool, well-ventilated place. If needed, contact SOFAR support.
ID124warning
Manual (PDF)
LowBattery
Likely cause
Battery voltage is too low
What to do
Check battery voltage and potential depth of discharge limitations.

More Shenzhen SOFARSOLAR Co Ltd inverters

ME 10KTL-3PH (AS4777-2 2020)

10 kW · 1φ

SOFAR 10KTLM-G3 (AS4777-2 2020)

10 kW · 1φ

SOFAR 10KTLX-G3-A (AS4777-2 2020)

10 kW · 1φ

SOFAR 11KTL-X (AS4777-2 2020)

10 kW · 1φ

SOFAR 11KTLX-G3-A (AS4777-2 2020)

10 kW · 1φ

SOFAR 10.5KTLM-G3 (AS4777-2 2020)

10.5 kW · 1φ

View all Shenzhen SOFARSOLAR Co Ltd inverters

More from Sofar

Other CEC-approved products from Sofar available in Australia.

Sofar Batteries

BTS 5K

4.992 kWh · LFP

BTS E10-DS5

9.984 kWh · LFP

BTS E15-DS5

14.976 kWh · LFP

BTS E20-DS5

19.968 kWh · LFP

BTS E5-DS5

4.992 kWh · LFP

BTS 5K

4.75 kWh

View all Sofar batteries

View full Sofar 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.

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.

Explore your options Compare inverters

Spotted something outdated?

Hybrid inverter · Sofar · CEC approved October 2026

Sofar ESI-9.99K-S1-A

CEC listing: ESI-9.99K-S1-A (AS4777-2 2020)

A 10 kW single-phase hybrid inverter that is battery-ready.

Installed in Perth, estimated: ~$4,745Estimate, modelled from its size, Feb 2026 rates
Rated power: 10kWHow much solar it can run at once
Battery-ready: YesHybrid: a battery plugs straight in, no second box

Datasheet (PDF)

ESI-9.99K-S1-A: the short answer

Feed-in credits (DEBS)DEBS pays for exports only when the inverter is 5 kW or less: NoDEBS pays for exports only when the inverter is 5 kW or less

What we can tell you

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

It is a hybrid inverter: solar and a battery run from the one unit, so adding a battery later doesn't need a second box.
It runs on a standard single-phase supply.
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: 10kW; How much solar it can turn into usable power at once
Max efficiency: Not on file: we don't have this figure from the manufacturer's documents yet; How much of the solar you make reaches the house
Phases: Single; Runs on a standard single-phase supply
Type: Hybrid; Runs solar and a battery from one unit
Warranty: 10yr; How long Shenzhen SOFARSOLAR Co Ltd stands behind it

Full datasheet

Every figure on file for the Sofar ESI-9.99K-S1-A, by section.

Full datasheet, by section
Specification	Value
Physical
IP rating	IP66
Installation requirements
Top clearance	250 mm
Side clearance	100 mm
AC breaker	20 A
Cable gauge	10 mm²
Earthing method	TN-S
DNSP pre-approval	Yes
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 and CEC approval

Battery compatible: Yes
Backup capable: Yes
CEC approved: 13 Oct 2026
Approval expiry: 13 Oct 2029
Status: Active
Listed for STCs: Yes

About Sofar

Years in the Australian market: 8 years
Australian office: Not verified
Category: Mid-Tier
CEC-approved inverters: 120
CEC-approved batteries: 6

View full profile →

What it costs in Perth

Estimated installed, inverter only

$3,497–$5,994

Estimatemodelled from its sizeFeb 2026 rates

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

ESM compliant: Check

Perth performance

Estimate for a full-size array on this inverter

Daily yield: 42.5 kWh
Annual yield: 15,497 kWh

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

Website

www.sofarsolar.com

8 years in Australian market

How it compares

The Sofar ESI-9.99K-S1-A against the closest-power inverters from other brands.

Specification	Sofar ESI-9.99K-S1-ASofar	GoodWe GW9.99K-EHB-AU-G11GoodWe	GoodWe GW9.9KAU-DTGoodWe

Rated power?	9.99 kW	9.99 kW	9.99 kW
Max efficiency?	Not on file	Not on file	Not on file
MPPT trackers?	Not on file	Not on file	Not on file

Phases	Single-phase	Single-phase	Three-phase
Type	Hybrid	Hybrid	Solar
Battery ready	Yes	Yes	No
Warranty	10 years	Not on file	Not on file

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

Documents

10-year inverter warranty

Sofar ESI-9.99K-S1-A

The warranty covers performance deterioration for 10 years, with a maximum of 90% capacity after 10 years. Claims can be made through 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: Warranty voided if not installed by an accredited technician or if tampered with.
Environment limits: Coverage void in extreme temperatures above 60°C.

Read the official warranty document (PDF)

Fault & error codes — Sofar ESI-9.99K-S1-A

From the install manual

12 documented

Showing 12 of 12. The official install manual is the authoritative source — always confirm before acting.

ID001criticalCall your installer
Manual (PDF)
Grid overvoltage
Likely cause
The grid voltage is too high
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. If the grid voltage is out of range, contact SOFAR support to adjust protection points after obtaining approval from the local grid operator.
ID002criticalCall your installer
Manual (PDF)
Grid undervolt
Likely cause
The grid voltage is too low
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. Contact SOFAR support if the grid voltage is out of range.
ID003criticalCall your installer
Manual (PDF)
Grid overfreq
Likely cause
The grid frequency is too high
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. Contact SOFAR support if needed.
ID004criticalCall your installer
Manual (PDF)
Grid underfreq
Likely cause
The grid frequency is too low
What to do
If the alarm occurs frequently, check AC circuit breaker and wiring. Contact SOFAR support if needed.
ID005criticalCall your installer
Manual (PDF)
GFCI Fault
Likely cause
Charge Leakage Fault
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. If not resolved, contact SOFAR support.
ID008criticalCall your installer
Manual (PDF)
IslandFault
Likely cause
Island protection error
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. Contact SOFAR support if not resolved.
ID012criticalCall your installer
Manual (PDF)
InvOVP
Likely cause
Inverter voltage error
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. Contact SOFAR support if not resolved.
ID042criticalCall your installer
Manual (PDF)
IsoFault
Likely cause
Low insulation impedance
What to do
Check insulation resistance. Repair any short circuits. Contact SOFAR support if needed.
ID046criticalCall your installer
Manual (PDF)
Reversal Connect
Likely cause
Input reverse connection error
What to do
Check DC input connection for correctness.
ID067criticalCall your installer
Manual (PDF)
BusUVP
Likely cause
Bus undervoltage during grid connection
What to do
Switch OFF inverter, wait for 5 minutes, then switch ON. Contact SOFAR support if the problem is not solved.
ID059warningCall your installer
Manual (PDF)
TemFault Inv1
Likely cause
Module temperature protection
What to do
Ensure inverter is installed in a cool, well-ventilated place. If needed, contact SOFAR support.
ID124warning
Manual (PDF)
LowBattery
Likely cause
Battery voltage is too low
What to do
Check battery voltage and potential depth of discharge limitations.

More Shenzhen SOFARSOLAR Co Ltd inverters

ME 10KTL-3PH (AS4777-2 2020)

10 kW · 1φ

SOFAR 10KTLM-G3 (AS4777-2 2020)

10 kW · 1φ

SOFAR 10KTLX-G3-A (AS4777-2 2020)

10 kW · 1φ

SOFAR 11KTL-X (AS4777-2 2020)

10 kW · 1φ

SOFAR 11KTLX-G3-A (AS4777-2 2020)

10 kW · 1φ

SOFAR 10.5KTLM-G3 (AS4777-2 2020)

10.5 kW · 1φ

View all Shenzhen SOFARSOLAR Co Ltd inverters