Growatt MTL-S User Manual

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: 02 8065 1298
Email: australia@ginverter.com
Email:
ausupport@ginverter.com
www.ginverter.com
Troubleshooting Guide for Growatt Inverters
Introduction
Due to a large amount of inappropriate outcome of troubleshooting on Growatt inverters,
our Australian office decide to compile a trouble shooting guide for Growatt installer
customers, which aims to resolve the problem in the initial stage of a technical diagnosis of
Growatt inverters and reduce the related cost of its process. We hope this document would
be helpful during a phone or email conversation when facing customer’s technical enquiries.
1. Faulty code
Faulty code identifies the current states of the Growatt inverter. Warnings do not relate to a
fault. When a fault code with a number after it appears in the display, it indicates a fault on
the inverter or the system and is usually cleared through an orderly shutdown/re-set or a
self-corrective action performed by the inverter. See the faulty codes in the following table
and corresponding solutions.
The faulty code will display on the first line of the LCD screes of Growatt inverters, please ask
the customers to read this part for you and then you can figure out the phenomenon
accordingly by following sections.
1.1 No AC Connection
Cause: Somewhere disconnected from grid to inverter.
Error message
Description
Solutions
No AC Connection
No utility grid connected or
utility grid power failure
1. Check if AC isolator /solar
main supply switch is on
2. Check if AC cables are
firmly and correctly
connected.
3. Contact Growatt to claim
warranty
1.2 AC V Outrange
Cause: The grid voltage is out of permitted range, or the inverter’s voltage limit is incorrect.
AC V
Outrange
MTL-S model
Go to 1.2.1
Non-MTL-S
model
Purchased after 2017
Go to 1.2.3

Growatt MTL-S Specifications

General

Max DC Voltage	550V
AC Voltage Range	180V-280V
THDi	<3%
DC Connection Type	MC4
Protection Degree	IP65
Frequency	50/60 Hz
Category	Inverter
Rated Output Power	3000W
Rated AC Power	3000W
Rated AC Voltage	230V
AC Connection Type	Plug
Operating Temperature Range	-25°C to 60°C
Cooling	Natural Cooling
Protection	DC Reverse Polarity

Summary

1. Faulty Code

1.1 No AC Connection

Troubleshooting steps for 'No AC Connection' error message, including checks for isolator, cables, and warranty claims.

1.2 AC V Outrange

Addresses 'AC V Outrange' errors due to grid voltage outside permitted range or incorrect voltage limits.

1.2.1 MTL-S Model Inverter Configuration

Instructions for MTL-S models: setting DIP switch 1 and 5 ON, 2, 3, 4 OFF for AC V Outrange.

1.2.2 Voltage Setting for Old Models

For old models, check AC voltage on LCD; proceed if below 262V for AC V Outrange.

1.2.3 Voltage Calibration via RS232

Calibrating inverter's voltage sensor using RS232 cable and PC software for AC V Outrange errors.

1.2.4 ShineServer Voltage Adjustment

Remotely change inverter tripping voltage Vmax via ShineServer for specific areas like Ergon Energy, Queensland.

1.2.5 ShineBus Software Voltage Settings

Using ShineBus software and RS232 cable to change voltage settings, including R1 Vac High and 10min Avg.

1.3 PV Isolation Low

Troubleshooting 'PV Isolation Low' errors caused by insulation problems, with inspection procedures for DC side.

1.4 AC F Outrange

Troubleshooting 'AC F Outrange' errors related to grid frequency deviation from permitted range.

1.5 Over Temperature

Troubleshooting 'Over Temperature' errors, suggesting rebooting the inverter or contacting Growatt.

1.6 Output High DCI

Troubleshooting 'Output High DCI' errors for excessive DC offset current, suggesting reboot or warranty claim.

1.7 Residual I high

Troubleshooting 'Residual I high' errors for high leakage current, involving checks and potential warranty claims.

1.8 PV Voltage High

Handling 'PV Voltage High' errors when DC input voltage exceeds tolerable limits, requiring immediate DC switch disconnect.

1.9 Auto Test Failed

Troubleshooting 'Auto Test Failed' errors, typically related to leakage current, suggesting inverter reboot.

1.10 Country Selection VDE0126-1-1

Guide to selecting the correct country/regulation code (VDE0126-1-1) for inverter setup and operation.

Error Codes

Error 100: Internal Reference Voltage Fault

Troubleshooting internal reference voltage faults, with suggestions to reboot or contact Growatt.

Error 101, 102, 121: Communication Error

Troubleshooting communication errors, including checking line connections and terminals, or contacting Growatt.

Error 111: Neutral Line Charged

Troubleshooting neutral line charged errors by testing line connections and checking for damaged terminals.

Error 116: EEPROM Fault

Troubleshooting EEPROM faults, suggesting inverter reboot or contacting Growatt for warranty.

Error 117: Relay Fault

Troubleshooting relay faults, with suggestions to reboot the inverter or contact Growatt for warranty.

Error 118: Init Model Fault

Troubleshooting init model faults by checking DIP switches and contacting Growatt for warranty.

Error 119: GFCI Device Damage

Troubleshooting GFCI device damage, suggesting inverter reboot or contacting Growatt for warranty.

Error 120: HCT Fault

Troubleshooting HCT faults, with suggestions to reboot the inverter or contact Growatt for warranty.

Error 122: Bus Voltage Fault

Troubleshooting bus voltage faults, suggesting inverter reboot or contacting Growatt for warranty.

2. Other Faults

No Display, No Light

Troubleshooting 'No display, no light' faults by checking PV array isolator and contacting Growatt.

Display Filled with Black Square

Troubleshooting 'Display filled with black square' faults by contacting Growatt for warranty.

Inverter Keeps Reconnecting

Troubleshooting 'Inverter keeps reconnecting' faults due to low DC input voltage (< 200V).

Inverter Trips Over Frequently

Troubleshooting frequent inverter trips due to AC V Outrange, checking isolator tripping.

AC Circuit Breaker Trips Over

Troubleshooting AC circuit breaker trips, checking isolator status and contacting Growatt if issues persist.