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I was checking the data and when I compared the IGBT temperature, I have attached the report of one day from March and other day from June I can see the mppt1 and mppt2 strings working almost fine during winter but in summers there is fluctuation coming in them.

Yes both sets of panels are washed once a week and even then this fluctuation does comes. Also there is no batteries connected as its ongrid based system and no limitation on export as well. The system is up and running from 3 years but I never checked this report earlier. I just was scrolling...

All of solar panels are south facing. There are total of 22 panels, where both mppt1 and mppt2 gets 11 panels each.

I was checking the DC analysis on app and found like DC from MPPT1 is fluctuating as compared to MPPT2 What can be the possible reason behind it and how it can be addressed? Its a 9.65kw grid tied based system. The inverter I am using is Solis 3P-10K 4G along with 22 Longi 440W PVs