Display OFF & MPPT Short

Modified on Tue, 10 Oct 2023 at 12:57 PM

1.    If installation is new then please first check polarity of all PV strings.

2.    Please ensure all the MC4 connectors are properly crimped.

3.    Check for any loose connection in MC4 connector.

4.    Please measure the both DC and AC side current by a clamp meter after connect or disconnect AC connector. (To confirm either inverter is in generation or not)

5. Please measure the DC current of PV strings by a clamp meter, if it's greater than 0.5A, please doesn’t turn off the DC switch directly. If you want to turn off the inverter, please turn off the AC breaker first, and then turn off the DC switch. If DC switch is not available please turn off DC supply from DCDB Box. If there is direct connection to inverter then please wait till the DC current is less than 0.5A.

6.    Please check the VOC    of all of the PV strings (Voltage should check from connector end after disconnect string from inverter).

7. 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.

8.    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.

9.    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.

10.  Take ACDB, DCDB close and clear photo, inverter serial no. which is stick on inverter body and inverter complete installation photo.

11.  If Data logger is connected, please remove the data logger and check the status.

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