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CEC approved: Nov 2023Report outdated info

Ningbo Sunways Technologies Co Ltd

STH-4.2KTL-HS (AS4777-2 2020)

4.2 kWSingle PhaseSolar InverterBackup Capable

Rated power: 4.2 kW
Max efficiency: 97.6%
Phases: Single
Warranty: 10 yr
Type: solar

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.

Efficiency

Max efficiency: 97.6%
European efficiency: 97%

Physical

IP rating: IP65

Technical specifications

Rated Power

4.2 kW

Max Efficiency

97.6%

Phases

Single Phase

Max Input Voltage

—

Min Input Voltage

—

Max Input Current

—

Output Voltage

—

Max Output Current

—

Country of Origin

Unknown

Series

STH-3K~8KTL

European Efficiency

97.0%

Warranty

10 years

Dimensions

0 x 0 x 0 mm

IP Rating

IP65

Operating Temp

-25°C to 60°C

Cooling

Natural

Features & compatibility

Battery Compatible

Backup Capable

Yes

ESM Compliant

Black Start

Grid Forming

Export Limiting

Remote Monitoring

CEC Approval Details

CEC Approved

10 Nov 2023

Approval Expiry

10 Nov 2026

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

Estimated price (installed)

$840–$1,680

Perth installed price estimate · medium confidence

Prices vary by installer, configuration, and site complexity. Get exact quotes via our installer matching.

Quick summary

4.2 kW rated power

97.6% efficiency

Single Phase

CEC Approved

WA Compliance (May 2026)

ESM CompliantCheck

Export LimitingNo

Remote MonitoringNo

From May 1, 2026, all new battery installations in WA require CSIP-AUS compliant inverters. Verify ESM status with your installer.

Perth installation note

Perth's high ambient temperatures (regularly 35°C+) can reduce inverter efficiency and trigger thermal throttling. For installations in direct sun or non-ventilated garages, consider inverters with active cooling and wide operating temperature ranges. All grid-connected installations require Western Power approval.

Browse CEC-approved batteries Browse CEC-approved panels

Compare systems

Compare this inverter with batteries for a complete system analysis

Perth performance

Daily Yield17.8 kWh

Annual Yield6,515 kWh

Based on 5 PSH/day (BOM) with 15% system derate.

4 years in Australian market

How it compares

The Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020) against the closest-power inverters from other brands.

Specification	Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)Ningbo Sunways Technologies Co Ltd	Beijing Hua Xin Liu He Investment (australia) Pty Ltd Z20I4K2D-2 (AS4777-2 2020)Beijing Hua Xin Liu He Investment (australia) Pty Ltd	Beijing Hua Xin Liu He Investment (australia) Pty Ltd Z20I4K2D (AS4777-2 2020)Beijing Hua Xin Liu He Investment (australia) Pty Ltd

Rated power?	4.2 kW	4.2 kW	4.2 kW
Max efficiency?	97.6%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	10 years	Not verified	Not verified

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

Resources

Datasheet Installation guide

10-year inverter warranty

Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)

Plain-English warranty summary not yet extracted for this product. The official warranty document is the authoritative source.

Coverage shape: Full-replacement coverage
If you sell the home: Does not transfer with the home

Fault & error codes — Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)

From the install manual

18 documented

Showing 18 of 18. The official install manual is the authoritative source — always confirm before acting.

Hard FaultcriticalCall your installer
Manual (PDF)
Critical system fault
Likely cause
Indicates serious issue, possibly hardware-related.
What to do
Restart the inverter; seek immediate assistance from installer.
Inverter OCcriticalCall your installer
Manual (PDF)
Inverter Over Current
Likely cause
Current draw exceeds maximum limits; wiring fault.
What to do
Restart inverter; check system wiring; contact installer.
Inverter OFcriticalCall your installer
Manual (PDF)
Inverter Over Frequency
Likely cause
Faulty frequency detection or grid issue.
What to do
Restart the inverter; seek installer support if necessary.
Inverter OVcriticalCall your installer
Manual (PDF)
Inverter Over Voltage
Likely cause
Voltage level exceeds inverter's capacity.
What to do
Restart inverter; consult installer if issue continues.
Backup OPwarning
Manual (PDF)
Backup operation issue
Likely cause
Excessive loads on the backup system.
What to do
Reduce loads connected in backup; restart inverter.
Backup OVwarningCall your installer
Manual (PDF)
Backup voltage is too high
Likely cause
Potential wiring fault in the backup circuit.
What to do
Restart the inverter; check wiring in backup system.
Bat OVwarning
Manual (PDF)
Battery Over Voltage
Likely cause
Battery voltage exceeds the allowable limit.
What to do
Check battery connections; ensure maximum voltage is not exceeded.
Battery FaultwarningCall your installer
Manual (PDF)
Battery related issue
Likely cause
Can indicate a fault within the battery system.
What to do
Restart inverter; contact installer for battery checks.
Bus Volt LowwarningCall your installer
Manual (PDF)
Low bus voltage detected
Likely cause
Possible internal fault.
What to do
Restart the inverter; contact installer if the issue persists.
DCI FaultwarningCall your installer
Manual (PDF)
Direct Current Input fault
Likely cause
Can indicate a malfunction or improper connection.
What to do
Restart the inverter; consult installer if the issue persists.
FLASH FaultwarningCall your installer
Manual (PDF)
Firmware issue detected
Likely cause
Potential software corruption or failure.
What to do
Restart inverter; if persists, consult installer.
Grid Frequency Faultwarning
Manual (PDF)
Grid frequency is out of acceptable range
Likely cause
Improper AC cable connections; unacceptable country settings.
What to do
Check all connections; consult local utility if necessary.
Grid Voltage Faultwarning
Manual (PDF)
Grid voltage is out of acceptable range
Likely cause
Impedance of the AC cable is too high; voltage protection range too narrow.
What to do
Replace AC cable if high impedance; adjust voltage protection if allowed.
Mains Lostwarning
Manual (PDF)
Mains supply is lost
Likely cause
Check whether the mains supply is lost; Check whether the AC breaker and terminal are well connected.
What to do
Check connections and ensure mains supply is active.
Meter Comm Faultwarning
Manual (PDF)
Meter communication fault
Likely cause
Issues with meter or meter wiring.
What to do
Verify meter connections; check meter for faults.
Phase Order Errwarning
Manual (PDF)
Phase order is incorrect
Likely cause
Improper phase sequence in inverter setup.
What to do
Restart the inverter; verify phase connections.
PV Power Lowwarning
Manual (PDF)
Insufficient power from PV array
Likely cause
PV array may be partially shaded or insufficient sunlight.
What to do
Check PV array for obstructions; verify sunlight availability.
SCI FaultwarningCall your installer
Manual (PDF)
Serial Communication Interface fault
Likely cause
Issues with communication lines or internal faults.
What to do
Restart the inverter; seek assistance from the installer.

Part of the Ningbo Sunways Technologies Co Ltd STH-3K~8KTL series

Compare every Ningbo Sunways Technologies Co Ltd STH-3K~8KTL 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?

Compare quotes from SAA-accredited local installers — you choose which to act on. No obligation, no pressure.

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.

Back to inverter index

CEC approved: Nov 2023Report outdated info

Ningbo Sunways Technologies Co Ltd

STH-4.2KTL-HS (AS4777-2 2020)

4.2 kWSingle PhaseSolar InverterBackup Capable

View datasheet (PDF)

Rated power: 4.2 kW
Max efficiency: 97.6%
Phases: Single
Warranty: 10 yr
Type: solar

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.

Efficiency

Max efficiency: 97.6%
European efficiency: 97%

Physical

IP rating: IP65

Technical specifications

Rated Power

4.2 kW

Max Efficiency

97.6%

Phases

Single Phase

Max Input Voltage

—

Min Input Voltage

—

Max Input Current

—

Output Voltage

—

Max Output Current

—

Country of Origin

Unknown

Series

STH-3K~8KTL

European Efficiency

97.0%

Warranty

10 years

Dimensions

0 x 0 x 0 mm

IP Rating

IP65

Operating Temp

-25°C to 60°C

Cooling

Natural

Features & compatibility

Battery Compatible

Backup Capable

Yes

ESM Compliant

Black Start

Grid Forming

Export Limiting

Remote Monitoring

CEC Approval Details

CEC Approved

10 Nov 2023

Approval Expiry

10 Nov 2026

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

Estimated price (installed)

$840–$1,680

Perth installed price estimate · medium confidence

Prices vary by installer, configuration, and site complexity. Get exact quotes via our installer matching.

Quick summary

4.2 kW rated power

97.6% efficiency

Single Phase

CEC Approved

WA Compliance (May 2026)

ESM CompliantCheck

Export LimitingNo

Remote MonitoringNo

From May 1, 2026, all new battery installations in WA require CSIP-AUS compliant inverters. Verify ESM status with your installer.

Perth installation note

Browse CEC-approved batteries Browse CEC-approved panels

Compare systems

Compare this inverter with batteries for a complete system analysis

Perth performance

Daily Yield17.8 kWh

Annual Yield6,515 kWh

Based on 5 PSH/day (BOM) with 15% system derate.

4 years in Australian market

How it compares

The Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020) against the closest-power inverters from other brands.

Specification	Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)Ningbo Sunways Technologies Co Ltd	Beijing Hua Xin Liu He Investment (australia) Pty Ltd Z20I4K2D-2 (AS4777-2 2020)Beijing Hua Xin Liu He Investment (australia) Pty Ltd	Beijing Hua Xin Liu He Investment (australia) Pty Ltd Z20I4K2D (AS4777-2 2020)Beijing Hua Xin Liu He Investment (australia) Pty Ltd

Rated power?	4.2 kW	4.2 kW	4.2 kW
Max efficiency?	97.6%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	10 years	Not verified	Not verified

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

Resources

Datasheet Installation guide

10-year inverter warranty

Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)

Plain-English warranty summary not yet extracted for this product. The official warranty document is the authoritative source.

Coverage shape: Full-replacement coverage
If you sell the home: Does not transfer with the home

Fault & error codes — Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)

From the install manual

18 documented

Showing 18 of 18. The official install manual is the authoritative source — always confirm before acting.

Hard FaultcriticalCall your installer
Manual (PDF)
Critical system fault
Likely cause
Indicates serious issue, possibly hardware-related.
What to do
Restart the inverter; seek immediate assistance from installer.
Inverter OCcriticalCall your installer
Manual (PDF)
Inverter Over Current
Likely cause
Current draw exceeds maximum limits; wiring fault.
What to do
Restart inverter; check system wiring; contact installer.
Inverter OFcriticalCall your installer
Manual (PDF)
Inverter Over Frequency
Likely cause
Faulty frequency detection or grid issue.
What to do
Restart the inverter; seek installer support if necessary.
Inverter OVcriticalCall your installer
Manual (PDF)
Inverter Over Voltage
Likely cause
Voltage level exceeds inverter's capacity.
What to do
Restart inverter; consult installer if issue continues.
Backup OPwarning
Manual (PDF)
Backup operation issue
Likely cause
Excessive loads on the backup system.
What to do
Reduce loads connected in backup; restart inverter.
Backup OVwarningCall your installer
Manual (PDF)
Backup voltage is too high
Likely cause
Potential wiring fault in the backup circuit.
What to do
Restart the inverter; check wiring in backup system.
Bat OVwarning
Manual (PDF)
Battery Over Voltage
Likely cause
Battery voltage exceeds the allowable limit.
What to do
Check battery connections; ensure maximum voltage is not exceeded.
Battery FaultwarningCall your installer
Manual (PDF)
Battery related issue
Likely cause
Can indicate a fault within the battery system.
What to do
Restart inverter; contact installer for battery checks.
Bus Volt LowwarningCall your installer
Manual (PDF)
Low bus voltage detected
Likely cause
Possible internal fault.
What to do
Restart the inverter; contact installer if the issue persists.
DCI FaultwarningCall your installer
Manual (PDF)
Direct Current Input fault
Likely cause
Can indicate a malfunction or improper connection.
What to do
Restart the inverter; consult installer if the issue persists.
FLASH FaultwarningCall your installer
Manual (PDF)
Firmware issue detected
Likely cause
Potential software corruption or failure.
What to do
Restart inverter; if persists, consult installer.
Grid Frequency Faultwarning
Manual (PDF)
Grid frequency is out of acceptable range
Likely cause
Improper AC cable connections; unacceptable country settings.
What to do
Check all connections; consult local utility if necessary.
Grid Voltage Faultwarning
Manual (PDF)
Grid voltage is out of acceptable range
Likely cause
Impedance of the AC cable is too high; voltage protection range too narrow.
What to do
Replace AC cable if high impedance; adjust voltage protection if allowed.
Mains Lostwarning
Manual (PDF)
Mains supply is lost
Likely cause
Check whether the mains supply is lost; Check whether the AC breaker and terminal are well connected.
What to do
Check connections and ensure mains supply is active.
Meter Comm Faultwarning
Manual (PDF)
Meter communication fault
Likely cause
Issues with meter or meter wiring.
What to do
Verify meter connections; check meter for faults.
Phase Order Errwarning
Manual (PDF)
Phase order is incorrect
Likely cause
Improper phase sequence in inverter setup.
What to do
Restart the inverter; verify phase connections.
PV Power Lowwarning
Manual (PDF)
Insufficient power from PV array
Likely cause
PV array may be partially shaded or insufficient sunlight.
What to do
Check PV array for obstructions; verify sunlight availability.
SCI FaultwarningCall your installer
Manual (PDF)
Serial Communication Interface fault
Likely cause
Issues with communication lines or internal faults.
What to do
Restart the inverter; seek assistance from the installer.

Part of the Ningbo Sunways Technologies Co Ltd STH-3K~8KTL series

Compare every Ningbo Sunways Technologies Co Ltd STH-3K~8KTL 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?

Compare quotes from SAA-accredited local installers — you choose which to act on. No obligation, no pressure.

About this data

STH-4.2KTL-HS (AS4777-2 2020)

Full specifications

Efficiency

Physical

Technical specifications

Features & compatibility

CEC Approval Details

About Ningbo Sunways Technologies Co Ltd

Estimated price (installed)

Quick summary

WA Compliance (May 2026)

Perth installation note

Related

Compare systems

Perth performance

How it compares

10-year inverter warranty

Fault & error codes — Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)

More Ningbo Sunways Technologies Co Ltd Inverters

Want to take the next step?

STH-4.2KTL-HS (AS4777-2 2020)

Full specifications

Efficiency

Physical

Technical specifications

Features & compatibility

CEC Approval Details

About Ningbo Sunways Technologies Co Ltd

Estimated price (installed)

Quick summary

WA Compliance (May 2026)

Perth installation note

Related

Compare systems

Perth performance

How it compares

10-year inverter warranty

Fault & error codes — Ningbo Sunways Technologies Co Ltd STH-4.2KTL-HS (AS4777-2 2020)

More Ningbo Sunways Technologies Co Ltd Inverters

Want to take the next step?