Growatt MTL-S User manual

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
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 New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
Purchased before 2017
AC voltage
reading<262V
1.2.2.1
AC voltage
reading>262V
1.2.2.2
NB: for 5000UE model, if the inverter indicate AC V OUTRAGE, please ask your customer to
check the AC switches first, including AC isolator and solar main supply switch(in the Main
Switch Board)
1.2.1 MTL-S model inverter
If the inverter’s model is MTL-S, please find DIP switch at the bottom of inverter and set it to
switch 1, 5 on while switch 2, 3, 4 off. Please refer to Fig 1.1 and Fig 1.2.
Fig 1.1

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
Fig 1.2
1.2.2 voltage setting by knocking the inverter (for old model)please check the LCD display
of the inverter below if the AC figure is lower than 262V or not. If yes, please follow
the next steps.
1.2.2.1 lower than 262V

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
Knock to make the display become bright Knock to item “Model: GTXXXXXX”Double
knock to enter voltage range setting Knock to change “QLD VMAX 255V”it to “Normal Vot
range”wait until the display become dark, then the inverter saved change.
Note: This function is only for Ergon Energy area, Queensland, Australia.
1.2.2.2 higher than 262V
Voltage calibration by RS232 USB cable
Our inverters support communication function via cable, please use RS232 USB cable and PC
computer to recalibrate your inverter’s voltage sensor as follows：
Turn on DC switch, compare the grid voltage measured by multi-meter, and the AC voltage
displayed on the inverter. If the difference is more than 3V, please calibrate the detected AC
voltage of the inverter by following steps:
•Connect the inverter to PC via RS232 USB cable.
•Open the software, ShineCHKVac to calibrate AC voltage as below picture.
•Turn on the AC breaker, then type the whole number of the voltage value measured
by multi-meter. For example, if the multi-meter measured grid voltage is 230.2V,
you can input 230, if the grid voltage is 230.6V, you should input 231V.
Please make sure to input the right COM port number of your PC.

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
Fig 1.4 ShineCHK
Increase voltage range via shinewifi
Basically we have two method to increase the voltage range, one is via ShineWifi and the
other is via software Shinebus.
a) Change it remotely via Wi-Fi module monitoring
If the inverter had been monitored by Growatt Wi-Fi module, then the setting can be
changed via computer/laptop remotely. ShineServer set inverter tripping voltage Vmax
Please follow the below steps to change the tripping voltage Vmax settings via ShineServer:
(1) After signed in, click Plant -> Device List, then click inverter. A list of monitored inverter
under the monitoring would then available.
(2) In the right side, operating field, click the SET symbol to open the Inverter setting
interface.
(3) Choose the option “Set grid voltage high”, and fill in the value. We suggest changing it to
268 volt.

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
(4) Click button to apply the change.
(5) Repeat to click button to apply the change again for 3 times.
1.2.3 ShineServer change inverter 10 minutes average voltage 255v setting
Please note, this option is only valid for new version inverters installed after 9, October,
2016. Which meet the new AS4777.2:2015 standard. Old version inverters installed before
that date are not have 10 minutes average voltage 255v limitation, thus, this step is NOT
required.
Please follow the below steps to change the 10 minutes average voltage 255v setting via

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
ShineServer:
(1) Continue with the above process, on inverter setting page, click ,
the page would then display an additional register option, as follows:
(2) Choose the option “register”, and fill in the register number 112, and the set value. We
suggest changing it to 265 volt. Please fill in 2650 there. As follows:

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
(7) Click button to apply the change.
(8) Repeat to click button to apply the change again for 5 (FIVE) times.
b) Use ShineBus software to change voltage settings
Tools we need to prepare are: RS232-to-USB cable
Laptop (or computer)
ShineBus software.
•Change tripping voltage Vmax setting
Please follow the below steps to change the tripping voltage Vmax setting:
(1) Get ShineBus software from Growatt and install it to your laptop. Then connect inverter
and laptop via RS232-to-USB cable.
(2) Switch on the DC switch to power on inverter, and switch OFF the AC switch to
disconnect inverter grid connection.
(3) Run ShineBus software.
(4) Choose the option “Parameter”, as follows:
(5) Choose “14. R1 Vac High”, as follows:

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
(6) Fill in RS232-to-USB cable’s COM port number in “COM:” field.
Set inverter’s COM address by knocking to inverter’s knock control panel (please refer to
the manual), and fill the address in “InvAdd” field.
Fill in the set value in “Set value” field. We suggest to change “14. R1 Vac High” value to
5v higher, thus is 268v.
(7) Click “Operate” to apply the change. Once inverter accepted, it would show “Set OK” in
“Set Result” filed.
(8) Tick the “Read” checkbox, and click “Operate” to read and check the change.

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
•Change 10 minutes average voltage 255v setting
Please note, this option is only valid for new version inverters installed after 9, October,
2016. Which meet the new AS4777.2:2015 standard. Old version inverters installed before
that date are not have 10 minutes average voltage 255v limitation, thus, this step is NOT
required.
Please follow the below steps to change the tripping voltage 10 minutes average voltage
255v setting:
(1) Continue with the above process, Choose “21.Vac 10min Avg”, as follows:
(2) Fill in the value in “Set value” field. We suggest change “21.Vac 10min Avg” value to 10

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
volt higher, thus is 265 volt.
(3) Then click “Operate” to apply the change. Once inverter accepted, it would show “Set
OK” in “Set Result” filed.
(4) Tick the “Read” checkbox, and click “Operate” to read and check the change.
After BOTH of the above adjustment had been done successfully (For new version inverters
installed after 9, October, 2016), please switch ON the AC switch to start up inverter.
1.3 PV Isolation Low
Cause: Insulation problem.
Error message
Description
Solutions
PV Isolation Low
Insulation problem
Error message
shown on the screen
all the day
Contact Growatt
to claim warranty
Message can only be
found in mornings,
and will disappear in
the afternoon.
Inspection
needed, it could
be a leakage on
DC side anywhere
from panels to DC
isolator, including
earth wires and
solar panels
Inspection procedure of insulation problem on site:
Check the earth wiring on AC side, check the isolation on DC side (PV side).
1. Check if the inverter’s AC side is well grounded,
2. Switch off the DC isolator, unplug the DC connectors, test the positive to earth and
negative to earth voltage or resistance on the DC MC4 plugs. If the voltage is not 0, please
check the earth wire of the solar panels.
3. Turn on the DC switch to measure the voltage of DC positive to ground and the voltage of
DC negative to ground. The reading will be 0 under normal condition, if the voltage is not 0,
you can locate the fault area by dividing the voltage by Voc of PV solar module, as a panel
with Voc=21v , if the test indicate that the Positive to ground voltage is 42V, Negative to
ground voltage is 63V, then the fault is located between the 2 and 3 panels from positive
side.

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
1.4 AC F Outrange
Cause: The grid frequency is out of permitted range, or the inverter’s frequency limits is
incorrect.
Error message
Description
Solutions
AC F Outrange
Grid frequency out of
permitted range
1. Check grid frequency
2. Contact Growatt to claim
warranty
1.5 Over Temperature
Error message
Description
Solutions
Over Temperature
Temperature outrange
1. Reboot inverter
2. Contact Growatt to claim
warranty
1.6 Output High DCI
Error message
Description
Solutions
Output High DCI
Output current DC offset
too high
1. Reboot inverter
2. Contact Growatt to claim
warranty
1.7 Residual I high
Error message
Description
Solutions
Residual I high
Leakage current too high
1. Reboot inverter
2. Test the AC leakage
current on solar
switches
3. Test DC side following
1.3 procedures
4. Contact Growatt to
claim warranty, if the
leakage issues are clear.
1.8 PV Voltage High
Error message
Description
Solutions

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
PV Voltage High
The DC input voltage is
exceeding the maximum
tolerable value
Disconnect the DC switch
immediately, check DC input
voltage
1.9 Auto Test Failed
Error message
Description
Solutions
Auto Test Failed
Leakage current too high
Reboot inverter
1.10 Please Select VDE0126-1-1
VDE0126-1-1 is a country selection code, please follow instructions below to fix this
problem. It’s all about single knock to switch the country (For Australia, we choose VDE0126-
1-1), and double knock to confirm the right country.

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
Error codes identify a possible equipment failure, fault ot incorrect inverter setting or
configuration. Tipically, error code can be cleared once the cause or fault is removed. Some
of the error codes may indicate a fatal error and require you to contact the supplier or
Growatt to replace it.
Error code
Description
Suggestion
Error 100
Internal reference voltage
fault
1. Reboot inverter
2. Contact Growatt to
claim warranty
Error 101, Error 102, Error
121
Communication error
1. Reboot inverter
2. Contact Growatt to
claim warranty
Error 111
Neutral line charged
1. Test N line and L line
reversed or not
2. Check the inverter
terminals damaged
or not
3. Contact Growatt for
a warranty if
damaged spot
found.
Error 116
EEPROM fault
4. Reboot inverter
5. Contact Growatt to
claim warranty
Error 117
Relay fault
1. Reboot inverter
2. Contact Growatt to
claim warranty
Error 118
Init model fault
1. Check the dip
switches at
underneath of the
inverter follow 1.2.1
2. Contact Growatt to
claim warranty
Error 119
GFCI Device Damage
1. Reboot inverter
2. Contact Growatt to
claim warranty
Error 120
HCT fault
1. Reboot inverter
2. Contact Growatt to
claim warranty
Error 122
Bus voltage fault
1. Reboot inverter
2. Contact Growatt to
claim warranty

Growatt New Energy Australia Pty Ltd
C1, 27-29 Fariola Street,
Silverwater NSW 2128
Phone: [phone]
Email: [email protected]
Email:
[e-mail]
www.ginverter.com
2Other faults
In some cases, there is no message on the screen, please determine the fault by matching up
with table of fault description below.
Fault description
Suggestions
No display, no light
1. Check if PV Array isolator is on
2. Contact Growatt to claim warranty
Display is filled with black square
Contact Growatt to claim warranty
Inverter keeps reconnecting
DC input voltage is too low(< 200V)
Inverter trips over frequently
AC V Outrange
AC circuit breaker trips over
1. Check the isolator tripping off or
not, once the inverter is on.
2. If the isolator tripped off just after
the inverter LCD screen display
“connect ok”, please contact
Growatt for a warranty enquiry.