1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Current at maximum power - PV cell

  1. May 25, 2016 #1
    Hello there !

    I got question regarding PV cell.
    The current at maximum power Im calculated from current-voltage characteristic doesn't equal to the one calculated from P(Ushunt, as you can see in the attached picture. http://prnt.sc/b864hx
    Furthermore, the Im from P(U) characteristic is about 2 times greater.
    This is rather strange result for me. I am of the opinion, that these currents should be approximately equal. Maybe I am wrong and you will say it's nothing weird about these results.I hope so :)
     
  2. jcsd
  3. May 25, 2016 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    To understand the result you need to know how the graph was arrived at.
     
  4. May 25, 2016 #3
    It is my graph ;)

    The current from P(U) is the current through the shut resistance, and Im from current-voltage characteristic shows the current without shut resistance. It is that what you mean?
    In here http://www.instsani.pl/images/PV8.ht4.jpg [Broken] you can see, that these currents are equal.
    Little confused now.
     
    Last edited by a moderator: May 7, 2017
  5. May 25, 2016 #4

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    OK - compare the methodology: you should find you are measuring different things, or the same thing in different circumstances.
     
  6. May 25, 2016 #5
    Is it that difference?
     
  7. May 25, 2016 #6

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Why not check and see if your results are consistent with standard models?
     
  8. May 25, 2016 #7
  9. May 25, 2016 #8
    From that I get:
    1) Characteristic U(I):
    IL=ID+ISh and ISh= 0, so IL=ID=0,5
    2) Characterisitic P(U):
    0,5=IL=ID+1,17(it's measured ISh), so ID=-0,67 mA

    sth wrong
     
  10. May 29, 2016 #9
    aby book explainig that pheno? It is written in every book I' ve examined that these two currents should be approx the same, what in my case obviously is not met.
     
    Last edited: May 29, 2016
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Current at maximum power - PV cell
Loading...