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Solar inverter · Ningbo Sunways Technologies · STS-xKTL-P series · CEC approved September 2025

Ningbo Sunways Technologies STS-4.2KTL-P

CEC listing: STS-4.2KTL-P (AS4777-2 2020)

A 4.2 kW single-phase solar inverter.

Installed in Perth, typical: ~$1,260; Estimate for the inverter alone — your quote will vary
Rated power: 4.2kW; How much solar it can run at once
Battery-ready: No; Solar-only: adding a battery later means a second inverter

Datasheet (PDF)Compare inverters See the whole STS-xKTL-P series

What we can tell you

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

It is a solar-only inverter: adding a battery later means a second inverter or an AC-coupled battery.
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: 4.2kW
Max efficiency How much of the solar you make reaches the house: 98.1%
Phases Runs on a standard single-phase supply: Single
Type Runs solar only: Solar
Warranty How long Ningbo Sunways Technologies Co Ltd stands behind it: 5yr

Full datasheet

Every figure on file for the Ningbo Sunways Technologies STS-4.2KTL-P, by section.

Full datasheet, by section
Specification	Value
Efficiency
Max efficiency	98.1%
European efficiency	97.5%
Physical
IP rating	IP65
Installation requirements
AC breaker	20 A
Cable gauge	4 mm²

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

Backup capable

CEC approval details

CEC approved

29 Sept 2025

Approval expiry

22 June 2027

Status

Active

Eligible for rebates

Yes

About Ningbo Sunways Technologies Co Ltd

Years in AU Market

4 years

Australian Office

Not verified

CEC-Approved Batteries

CEC-Approved Panels

What it costs in Perth

Typical installed, inverter only

$840–$1,680

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: 17.8 kWh
Annual yield: 6,515 kWh

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

4 years in Australian market

How it compares

The Ningbo Sunways Technologies STS-4.2KTL-P against the closest-power inverters from other brands.

Specification	Ningbo Sunways Technologies STS-4.2KTL-PNingbo Sunways Technologies	Beijing Hua Xin Liu He Investment Z20I4K2D-2Beijing Hua Xin Liu He Investment	Beijing Hua Xin Liu He Investment Z20I4K2DBeijing Hua Xin Liu He Investment

Rated power?	4.2 kW	4.2 kW	4.2 kW
Max efficiency?	98.1%best value	0.0%	0.0%
MPPT trackers?	Not verified	Not verified	Not verified

Phases	Single-phase	Single-phase	Single-phase
Type	Solar	Solar	Solar
Battery ready	No	No	No
Warranty	5 years	Not verified	Not verified

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

Documents

5-year inverter warranty

Ningbo Sunways Technologies STS-4.2KTL-P

The warranty covers the inverter against defects in materials and workmanship, provided it's installed per instructions. Claims must be submitted via the service contact, but the warranty does not cover damage from improper installation or environment that does not meet specified requirements.

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

Coverage shape: Full-replacement coverage
If you sell the home: Does not transfer with the home
What voids it: Damages caused by irregular transportation, incorrect storage, installation, or use; installation and use by non-professionals or untrained personnel; failure to comply with instructions and safety warnings; operation beyond specified parameters; unauthorized disassembly or modification; damages due to insufficient grounding.
Environment limits: Damages caused by abnormal natural environment (force majeure, such as lightning, earthquake, fire, storm, etc.)

Read the official warranty document (PDF)

Fault & error codes — Ningbo Sunways Technologies STS-4.2KTL-P

From the install manual

16 documented

Showing 16 of 16. The official install manual is the authoritative source — always confirm before acting.

Bus Voltage FaultcriticalCall your installer
Manual (PDF)
Bus voltage is out of acceptable range.
Likely cause
Input voltage may be above limits.
What to do
Check input voltage and seek assistance if needed.
Grid Frequency FaultcriticalCall your installer
Manual (PDF)
Grid frequency is out of expected range.
Likely cause
Improper AC cable connections or grid frequency issues.
What to do
Check the AC cable connection and possibly change to another country with a wider protection range if allowed by local electricity providers.
Grid Voltage FaultcriticalCall your installer
Manual (PDF)
Grid voltage exceeded tolerable limits.
Likely cause
AC cable impedance might be too high, or voltage protection range needs adjustment.
What to do
Check the impedance of the AC cable and change to a thicker cable if necessary. Extend voltage protection range if allowed by the electricity company.
ISO Over LimitationcriticalCall your installer
Manual (PDF)
Insulation resistance is exceeding limits.
Likely cause
Potential failure in insulation system.
What to do
Restart the inverter and seek assistance.
PV Over VoltagecriticalCall your installer
Manual (PDF)
PV input voltage exceeded maximum levels.
Likely cause
Too many PV panels connected causing high voltage.
What to do
Reduce the number of PV panels to ensure the open-circuit voltage is below the maximum allowed.
AC Transducer Faultwarning
Manual (PDF)
Fault detected in AC transducer.
Likely cause
Monitoring issue with the AC side.
What to do
Restart the inverter and check connections.
DCI Faultwarning
Manual (PDF)
Direct current input fault detected.
Likely cause
Inverter issue requiring a restart.
What to do
Restart the inverter.
E2 FaultwarningCall your installer
Manual (PDF)
An unspecified internal error.
Likely cause
Possible internal fault.
What to do
Restart the inverter and seek help if issue persists.
Flash FaultwarningCall your installer
Manual (PDF)
Software failure observed in flash memory.
Likely cause
Internal software issue.
What to do
Restart the inverter and consult with the manufacturer if it continues.
GFCI Device FaultwarningCall your installer
Manual (PDF)
GFCI device is malfunctioning.
Likely cause
Issues with the GFCI device.
What to do
Restart the inverter and consult with an installer.
GFCI FaultwarningCall your installer
Manual (PDF)
Ground Fault Circuit Interrupter has tripped.
Likely cause
An electrical fault detected by the GFCI.
What to do
Restart inverter and check the system.
Inverter Over TemperaturewarningCall your installer
Manual (PDF)
Inverter's internal temperature exceeded safe limits.
Likely cause
Excessive input voltage or inadequate cooling.
What to do
Check for high input voltage and cool down the inverter; seek assistance if necessary.
Mains Lostwarning
Manual (PDF)
Power supply has been interrupted.
Likely cause
Check if the mains supply is lost.
What to do
Check whether the mains supply is lost and whether the AC breaker and terminal are well connected.
Relay Check FailwarningCall your installer
Manual (PDF)
Relay system failure.
Likely cause
Fault within relay connections.
What to do
Restart the inverter and consult assistance if necessary.
SCI Faultwarning
Manual (PDF)
Signal communication issue.
Likely cause
Faulty signal connections or internal errors.
What to do
Restart the inverter.
SPI Faultwarning
Manual (PDF)
Serial peripheral interface error.
Likely cause
Internal communication failure.
What to do
Restart the inverter and check connections.

Part of the Ningbo Sunways Technologies STS-xKTL-P series

Compare every Ningbo Sunways Technologies STS-xKTL-P variant side by side →

More Ningbo Sunways Technologies Co Ltd Inverters

STH-10KTL-HT-P (AS4777-2 2020)

10 kW · 3φ

STH-12KTL-HT-P (AS4777-2 2020)

12 kW · 3φ

STH-3.6KTL-HS (AS4777-2 2020)

3.6 kW · 1φ

STH-3.6KTL-HSS (AS4777-2 2020)

3.6 kW · 1φ

STH-3KTL-HS (AS4777-2 2020)

3 kW · 1φ

STH-3KTL-HSS (AS4777-2 2020)

3 kW · 1φ

View all Ningbo Sunways Technologies Co Ltd inverters

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.

Solar inverter · Ningbo Sunways Technologies · STS-xKTL-P series · CEC approved September 2025

Ningbo Sunways Technologies STS-4.2KTL-P

CEC listing: STS-4.2KTL-P (AS4777-2 2020)

A 4.2 kW single-phase solar inverter.

Installed in Perth, typical: ~$1,260; Estimate for the inverter alone — your quote will vary
Rated power: 4.2kW; How much solar it can run at once
Battery-ready: No; Solar-only: adding a battery later means a second inverter

Datasheet (PDF)Compare inverters See the whole STS-xKTL-P series

Spotted something outdated?

What we can tell you

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

It is a solar-only inverter: adding a battery later means a second inverter or an AC-coupled battery.
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: 4.2kW
Max efficiency How much of the solar you make reaches the house: 98.1%
Phases Runs on a standard single-phase supply: Single
Type Runs solar only: Solar
Warranty How long Ningbo Sunways Technologies Co Ltd stands behind it: 5yr

Full datasheet

Every figure on file for the Ningbo Sunways Technologies STS-4.2KTL-P, by section.

Full datasheet, by section
Specification	Value
Efficiency
Max efficiency	98.1%
European efficiency	97.5%
Physical
IP rating	IP65
Installation requirements
AC breaker	20 A
Cable gauge	4 mm²

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

Backup capable

CEC approval details

CEC approved

29 Sept 2025

Approval expiry

22 June 2027

Status

Active

Eligible for rebates

Yes

About Ningbo Sunways Technologies Co Ltd

Years in AU Market

4 years

Australian Office

Not verified

CEC-Approved Batteries

CEC-Approved Panels

What it costs in Perth

Typical installed, inverter only

$840–$1,680

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: 17.8 kWh
Annual yield: 6,515 kWh

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

4 years in Australian market

How it compares

The Ningbo Sunways Technologies STS-4.2KTL-P against the closest-power inverters from other brands.

Specification	Ningbo Sunways Technologies STS-4.2KTL-PNingbo Sunways Technologies	Beijing Hua Xin Liu He Investment Z20I4K2D-2Beijing Hua Xin Liu He Investment	Beijing Hua Xin Liu He Investment Z20I4K2DBeijing Hua Xin Liu He Investment

Rated power?	4.2 kW	4.2 kW	4.2 kW
Max efficiency?	98.1%best value	0.0%	0.0%
MPPT trackers?	Not verified	Not verified	Not verified

Phases	Single-phase	Single-phase	Single-phase
Type	Solar	Solar	Solar
Battery ready	No	No	No
Warranty	5 years	Not verified	Not verified

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

Documents

5-year inverter warranty

Ningbo Sunways Technologies STS-4.2KTL-P

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

Coverage shape: Full-replacement coverage
If you sell the home: Does not transfer with the home
What voids it: Damages caused by irregular transportation, incorrect storage, installation, or use; installation and use by non-professionals or untrained personnel; failure to comply with instructions and safety warnings; operation beyond specified parameters; unauthorized disassembly or modification; damages due to insufficient grounding.
Environment limits: Damages caused by abnormal natural environment (force majeure, such as lightning, earthquake, fire, storm, etc.)

Read the official warranty document (PDF)

Fault & error codes — Ningbo Sunways Technologies STS-4.2KTL-P

From the install manual

16 documented

Showing 16 of 16. The official install manual is the authoritative source — always confirm before acting.

Bus Voltage FaultcriticalCall your installer
Manual (PDF)
Bus voltage is out of acceptable range.
Likely cause
Input voltage may be above limits.
What to do
Check input voltage and seek assistance if needed.
Grid Frequency FaultcriticalCall your installer
Manual (PDF)
Grid frequency is out of expected range.
Likely cause
Improper AC cable connections or grid frequency issues.
What to do
Check the AC cable connection and possibly change to another country with a wider protection range if allowed by local electricity providers.
Grid Voltage FaultcriticalCall your installer
Manual (PDF)
Grid voltage exceeded tolerable limits.
Likely cause
AC cable impedance might be too high, or voltage protection range needs adjustment.
What to do
Check the impedance of the AC cable and change to a thicker cable if necessary. Extend voltage protection range if allowed by the electricity company.
ISO Over LimitationcriticalCall your installer
Manual (PDF)
Insulation resistance is exceeding limits.
Likely cause
Potential failure in insulation system.
What to do
Restart the inverter and seek assistance.
PV Over VoltagecriticalCall your installer
Manual (PDF)
PV input voltage exceeded maximum levels.
Likely cause
Too many PV panels connected causing high voltage.
What to do
Reduce the number of PV panels to ensure the open-circuit voltage is below the maximum allowed.
AC Transducer Faultwarning
Manual (PDF)
Fault detected in AC transducer.
Likely cause
Monitoring issue with the AC side.
What to do
Restart the inverter and check connections.
DCI Faultwarning
Manual (PDF)
Direct current input fault detected.
Likely cause
Inverter issue requiring a restart.
What to do
Restart the inverter.
E2 FaultwarningCall your installer
Manual (PDF)
An unspecified internal error.
Likely cause
Possible internal fault.
What to do
Restart the inverter and seek help if issue persists.
Flash FaultwarningCall your installer
Manual (PDF)
Software failure observed in flash memory.
Likely cause
Internal software issue.
What to do
Restart the inverter and consult with the manufacturer if it continues.
GFCI Device FaultwarningCall your installer
Manual (PDF)
GFCI device is malfunctioning.
Likely cause
Issues with the GFCI device.
What to do
Restart the inverter and consult with an installer.
GFCI FaultwarningCall your installer
Manual (PDF)
Ground Fault Circuit Interrupter has tripped.
Likely cause
An electrical fault detected by the GFCI.
What to do
Restart inverter and check the system.
Inverter Over TemperaturewarningCall your installer
Manual (PDF)
Inverter's internal temperature exceeded safe limits.
Likely cause
Excessive input voltage or inadequate cooling.
What to do
Check for high input voltage and cool down the inverter; seek assistance if necessary.
Mains Lostwarning
Manual (PDF)
Power supply has been interrupted.
Likely cause
Check if the mains supply is lost.
What to do
Check whether the mains supply is lost and whether the AC breaker and terminal are well connected.
Relay Check FailwarningCall your installer
Manual (PDF)
Relay system failure.
Likely cause
Fault within relay connections.
What to do
Restart the inverter and consult assistance if necessary.
SCI Faultwarning
Manual (PDF)
Signal communication issue.
Likely cause
Faulty signal connections or internal errors.
What to do
Restart the inverter.
SPI Faultwarning
Manual (PDF)
Serial peripheral interface error.
Likely cause
Internal communication failure.
What to do
Restart the inverter and check connections.

Part of the Ningbo Sunways Technologies STS-xKTL-P series

Compare every Ningbo Sunways Technologies STS-xKTL-P variant side by side →

More Ningbo Sunways Technologies Co Ltd Inverters

STH-10KTL-HT-P (AS4777-2 2020)

10 kW · 3φ

STH-12KTL-HT-P (AS4777-2 2020)

12 kW · 3φ

STH-3.6KTL-HS (AS4777-2 2020)

3.6 kW · 1φ

STH-3.6KTL-HSS (AS4777-2 2020)

3.6 kW · 1φ

STH-3KTL-HS (AS4777-2 2020)

3 kW · 1φ

STH-3KTL-HSS (AS4777-2 2020)

3 kW · 1φ

View all Ningbo Sunways Technologies Co Ltd inverters

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