1. Check for any loose connection in MC4 connector.
2. Please ensure all the MC4 connectors are properly crimped.
3. Check for the proper polarity of the strings which is connected to the inverter.
4. Check whether the same fault is occurring by connecting a single string to all MPPT'S.
5. Please check the VOC of all of the PV strings (Voltage should check from connector end after disconnect string from inverter).
6. Use a multi-meter to check the voltages between PV+ and earth, PV- and earth of all the PV strings. It should be decreasing from values between 5% and 95% of single PV module Voc. If voltage stuck on above single module VOC or in decreasing condition if voltage getting increase that means there is some fault with that strings.
7. If system is three phase (Check AC side voltage Phase to Phase, phase to neutral and neutral to earthing.) Always check reading from inverter AC gland end.
8. If system is single phase (Check AC side voltage Phase to neutral, phase to earthing and neutral to earthing.) Always check reading from inverter AC gland end.
9. Take complete reading of information menu like DC1, DC2, DC3, DC4 then VA, VB, VC or VGrid then Status (Error) and Total energy.
10. Take reading from advance info Alarm messages, version, running messages, warning messages.
11. Take ACDB, DCDB close and clear photo, inverter serial no. which is stick on inverter body and inverter complete installation photo.
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