Fronius inverter clipping production

Problems Investigating
#1

O.P.

Hi everyone. I have an issue with my solar system and i hope that i can get an idea of what is happening. Fronius inverter 6.0.3M connected to two strings of 3.7kw and 3.3kw (total 7kw). Mppt1 string production is clipped at peak hours (flat line) with total production maxing out at 5.5kw on a sunny day. Mppt 2 is showing a normal curve. Dynamic power limit is set to “off”. What could be the issue?

Another thing to add is that i have expanded the system by adding 2 additional panels to the first string and 1 additional panel to the second string of the same make and wattage to the existing. While production has increased for the first string, second string’s production remains the same. I have checked whether the additional panel is actually connected by shading it purposedly and production drops normally when shaded.

Below is a link to dropbox with several printscreens from solar.web

Thank you

#2

Hi, Does / is the MPPT1 string of panels exceeding the DC input limits of the inverter / string?

#3

Hi, i don’t think so since the limit is 16A.

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#4

Is it possible that the inverter splits the string limits equally i.e. 3kw per string?

#5

I facing the same problem but with Sungrow. Do you have the solution ?

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#7

No, unfortunately

#8

Just an update. Problem fixed by changing power reactive mode to c.cosφ and setting c.cosφ to +1.000. Thank you everyone for your input

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