Shading effect on single MPPT inverter

MbannMbann Registered Users Posts: 2
Good day 
this is my first post here, 
I have a grid tied project where ill be using Jinko solar modules (JKM325PP-72) and ABB TRIO 50.0 TL3 single MPPT inverter.
I've got 10 strings of 16 series panel connected to the inverter, Due to site limitation one of these strings will be partially shaded through the morning hours (1-2 hours daily) 
My question is: Will this shaded string affect the output of other strings or the shading losses will only occur in the shaded string.

Thanks in advance 

Comments

  • mcgivormcgivor Registered Users Posts: 1,281 ✭✭✭✭
    Welcome to the forum.
    The shaded panels within a string will affect the string as a whole, other strings not shaded will not be compromised, if the shading is during the early morning when angle of the sun is acute, there is generally little production to be lost, the hours between approximately 10 am. to 2 pm. is the critical period, where shading can have an impact on overall production. 
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • MbannMbann Registered Users Posts: 2
    mcgivor said:
    Welcome to the forum.
    The shaded panels within a string will affect the string as a whole, other strings not shaded will not be compromised, if the shading is during the early morning when angle of the sun is acute, there is generally little production to be lost, the hours between approximately 10 am. to 2 pm. is the critical period, where shading can have an impact on overall production. 
    Thank you for your response , 
    I've been told that since the current of the shaded string will be lowered the MPPT algorithm will try to find the maxiumum power point for all the strings , since the voltage is constant on the parallel strings the current on all strings will be lowered to match the shaded string current. 
    is that correct or not 
  • mcgivormcgivor Registered Users Posts: 1,281 ✭✭✭✭
    The shaded string will in effect be disconnected, the ballance of strings, 9 in your case, would provide all the power at that point, the "bad" string would not pull down the  "good" strings" it would simply not contribute to the overall production, until it receives sun, then it will contribute it's share of the input, the MPPT will sweep the input to find when this occurs.
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • boBboB Solar Expert Posts: 941 ✭✭✭
    Partial shading can be mitigated much of the time by using a chain-saw

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