Yonatan Yonatan's posts

Posted by Yonatan Yonatan on Feb 9, 2015 07:18 am

#1 -  Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > strange phenomena is PV output
Hi,
I have 16 sunpower 318 panels connected to sma smc5000a (inTL) inverter (2 strings of 8 panels each).
Each panel has also Tigo optimizer. Tree weeks ago, my inverter started issuing "MPP/insulation warning messages", and the red light (ground fault indication) was turned on. At the same time exactly, I strated to witness a decrease in the output of the system - a strange phenomena could be seen in the Tigo monitoring:
In both strings, roughly speaking, the last panels are producing significantly smaller output then the first panels.
Yesterday, the positive grounding kit of the inverter was replaced, and indeed the red light is off, and no more warning messages are issued by the inverter.
However, the output of the system, as shown by the Tigo monitoring, shows exactly the same strange phenomena. Needless to say - the phenomena is seen in completely unshaded conditions for all panels.
Does anyone has any idea what happend in my system?
Thanks.
Jonathan
 

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