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12 solar panels wiring

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  • #16
    Read your panel specs
    In there they will give you a temperature coefficient
    Generally it is somewhere around .36% per degree C
    So take your panel open circuit voltage Multiply that by the percent
    In the example above you would multiply by .0036.
    Multiply that by the difference in temperature in degrees C from 25.
    In your case that number would be 26 as record low was -1C
    That will give you the open circuit voltage increase at the low temp
    Now add to that the open circuit voltage of the panel to get panel open circuit voltage. This will give you the value for one panel. Then multiply that by how many panels are in a string.
    NABCEP certified Technical Sales Professional

    [URL="http://www.solarpaneltalk.com/showthread.php?5334-Solar-Off-Grid-Battery-Design"]http://www.solarpaneltalk.com/showth...Battery-Design[/URL]

    [URL]http://www.calculator.net/voltage-drop-calculator.html[/URL] (Voltage drop Calculator among others)

    [URL="http://www.gaisma.com"]www.gaisma.com[/URL]

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    • #17
      Originally posted by Naptown View Post
      Read your panel specs
      In there they will give you a temperature coefficient
      Generally it is somewhere around .36% per degree C
      So take your panel open circuit voltage Multiply that by the percent
      In the example above you would multiply by .0036.
      Multiply that by the difference in temperature in degrees C from 25.
      In your case that number would be 26 as record low was -1C
      That will give you the open circuit voltage increase at the low temp
      Now add to that the open circuit voltage of the panel to get panel open circuit voltage. This will give you the value for one panel. Then multiply that by how many panels are in a string.
      Thanks for the detailed answer

      I get it now.

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