Panel Generation Factor

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  • vikas maurya
    Junior Member
    • Dec 2010
    • 21
    #1

    Panel Generation Factor

    Please explain Panel generation factor.
    How it can be calculated?
    What is the PGF for India?

    Thanks
    Tags: panel generation factor, pgf
  • MarineLiner
    Solar Skipper
    • May 2009
    • 656
    #2
    [quote]Solar Panel Generation Factor for Ludhiana, Punjab, India?
    2 posts - 1 author - Last post: May 12, 2010
    Good Morning! We were going through how to design a Solar PV System, but got struck at a point how to derive Panel*

    Comment

    • russ
      Solar Fanatic
      • Jul 2009
      • 10360
      #3
      It is a meaningless term generated by someone.

      What you care about is insolation - NASA gives it for many locations around the world.
      ASDC | Projects | SSE
      http://eosweb.larc.nasa.gov/sse/


      PV Watts also provides insolation values for many places around the world.

      Russ
      [SIGPIC][/SIGPIC]

      Comment

      • vikas maurya
        Junior Member
        • Dec 2010
        • 21
        #4
        Originally posted by russ View Post
        It is a meaningless term generated by someone.

        What you care about is insolation - NASA gives it for many locations around the world.
        ASDC | Projects | SSE
        http://eosweb.larc.nasa.gov/sse/


        PV Watts also provides insolation values for many places around the world.

        Russ
        Thanks MarineLiner and Russ.

        I also felt that this term is meaningless but Russ just see the link provided by marineliner.......www.leonics.com > Home - Options
        They are doin PV sizing by using this term............and just check the example

        Thanks

        Comment

        • russ
          Solar Fanatic
          • Jul 2009
          • 10360
          #5
          I looked at their calculations. They made up a factor - nothing more.

          You are better off following the calculations you find here - provided by Mike & Sunking. Mike & Sunking have explained more clearly what they are doing without using any 'magic sauce' called panel generation factor.

          Same for battery sizing.

          Russ
          [SIGPIC][/SIGPIC]

          Comment

          • Alkhayam
            Junior Member
            • Apr 2012
            • 2
            #6
            Solar Irradiation

            Russ, team. I have a question and appreciate your help. From the Nasa data base i got the average monthly solar irradiation on a horizontal surface. Is this enough or i should also calculate the solar irradiation on my tilted (under design) panels? I have a tilted roof at 16 Degrees on which i would like to install the panels. I found this program that when putting my latitude (33 Degrees), panel tilt angle (16 Degrees) and solar irradiation on a horizontal surface will calculate the solar irradiation on the tilted module. is this a better number? Here is the link.


            http://pvcdrom.pveducation.org/SUNLIGHT/MODTILT.HTM


            Thanks
            Alkhayam.

            Comment

            • russ
              Solar Fanatic
              • Jul 2009
              • 10360
              #7
              Yes - PV Watts uses NASA data but with the inclination matching the latitude. Unfortunately PV Watts does not show any data for your location.
              [SIGPIC][/SIGPIC]

              Comment

              • Alkhayam
                Junior Member
                • Apr 2012
                • 2
                #8
                Russ thanks. is there a mathematical equation that i can use to reach the size of panels needed? I am doing a research project and need to show my calculations. here are the data i have so far:

                Daily power requirement is 8.96KWh/ day. Based on all appliances and their daily use (timing).
                Solar irradiation at my location from NASA and taking the least sunny month of December is 3.34 KWh/m2/day. This is based on a 16 degrees fixed tilted PV arrays on my roof.

                The question is how to go from these data to calculate the W peak. I know you don't believe in the panel generation factor. I agree with you. But how can I reach the W peak?

                Thanks for the help.

                Best Regards
                Alkhayam

                Comment

                • Naptown
                  Solar Fanatic
                  • Feb 2011
                  • 6880
                  #9
                  Originally posted by Alkhayam View Post
                  Russ thanks. is there a mathematical equation that i can use to reach the size of panels needed? I am doing a research project and need to show my calculations. here are the data i have so far:

                  Daily power requirement is 8.96KWh/ day. Based on all appliances and their daily use (timing).
                  Solar irradiation at my location from NASA and taking the least sunny month of December is 3.34 KWh/m2/day. This is based on a 16 degrees fixed tilted PV arrays on my roof.

                  The question is how to go from these data to calculate the W peak. I know you don't believe in the panel generation factor. I agree with you. But how can I reach the W peak?

                  Thanks for the help.

                  Best Regards
                  Alkhayam
                  Why is peak important you are looking at an overall daily consumption
                  So for 8.96 KWH per day lets round up to 9
                  assuming you are using an MPPT charge controller
                  Battery bank would need to be a minimum of 45000 Watt hours to allow for two days of no sun and not discharge the batteries more than 40%
                  45000 WH = 937 AH battery bank @48V (that's a big honking battery)
                  Now to generate that with PV would be a bit different
                  9 KWH x 1.5 / 3.5 or daily use x losses / sun hours or 3.87 KW of PV (round up to 4)
                  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]

                  Comment

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