Growatt Solar Inverter PV Isolation Low
Is your Growatt Solar Inverter showing a PV Isolation Low message?
When your Growatt solar inverter is operating correctly the inverter light will be a solid green. When the light is red it indicates that your inverter has detected a fault with the system – the particular fault details are displayed on the screen.
Growatt Solar Inverter PV Isolation Low – What does it mean?
According to the Growatt solar inverter manual a PV Isolation Low message on your inverter is telling you that the inverter has detected a problem with the insulation on the system. That’s helpful isn’t it? What this means is the system has detected leakage of electricity in the system to earth, and this condition is called an earth fault. The following list are some of the common causes of solar power earth faults that would make a Growatt solar inverter display a PV Isolation Low message:
- Moisture ingress in the solar panels
- Moisture ingress in the cabling, plugs, isolators or inverter
- Damage to cables in the solar power system
The first thing we recommend you try is a reboot of your solar power system.
Rebooting Your Growatt Solar Inverter
It is possible that the error you are seeing with your Growatt inverter is just a glitch which will be fixed by a system reboot. To reboot your Growatt solar inverter please follow these steps:
- Turn OFF the solar supply main switch (or inverter AC isolator if present).
- Turn OFF the PV array DC isolator.
- Wait for the inverter screen to go completely blank and the red fault light to turn off.
- Turn ON the PV array DC isolator.
- Turn ON the solar supply main switch (or inverter AC isolator if present).
- Wait a few minutes while the inverter boots back up.
If immediately after restarting the inverter you see the error message “PV isolation low” unfortunately it appears you may have an issue with your system which is going to require the services of a solar accredited electrician to find the fault and advise you further. If you are in South East QLD somewhere near the Gold Coast or Brisbane area we can help.
For further advice please complete the form above under the URGENT heading and we’ll assist you further.
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Hi Erol, sorry to hear about the issue you are having with your Growatt inverter, it does sound like it’s a panel issue more than an inverter issue though. The isolation fault you are having sounds like a cumulative fault, so the more panels you have connected to the inverter the lower the resistance to earth. It sounds like you will need to find a local solar power electrician to assist you further with this one.
Hi , I have inverter Growatt TL 15000 . From one week every morning inverter showing error “125 – PV isolation low”. It has 3 strings with 24 panels . When I demount one of the strings (no matter which one) -everything is fine. I have no internet connection and not registered at data logger. Can you help me to resolve this problem?What can I do. Thanks
Sorry Rostom the Error Code 111 is not in the Growatt Sungold fault list so we are not sure. If you find out anything please let us know so we can let other people know as well.
Please What does it Mean this code Warning 111 in the inverter growatt 10kw
Hi Vinod, Thanks for contacting us. The PV Insulation fault is showing because your inverter has detected that there is voltage leakage down to earth at some point in your PV array. Most probably your inverter is working fine and the problem is with your panels.