Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Solar Energy Calculation

  1. Sep 12, 2011 #1
    Can we calculate the daily energy generation of 20KW power pack if have the following information:


    Date Time GHI DNI DHI
    01-01-2008 08:00 0 0 0
    01-01-2008 09:00 149 398 75
    01-01-2008 10:00 348 686 98
    01-01-2008 11:00 512 792 112
    01-01-2008 12:00 626 845 119
    01-01-2008 13:00 674 859 123
    01-01-2008 14:00 659 860 119
    01-01-2008 15:00 574 827 112
    01-01-2008 16:00 431 753 100
    01-01-2008 17:00 245 497 106
    01-01-2008 18:00 36 63 30
    01-01-2008 19:00 0 0 0

    Thank you.
     
  2. jcsd
  3. Sep 12, 2011 #2

    berkeman

    User Avatar

    Staff: Mentor

    What is the context of the question? Can you please provide more details? Is this question for schoolwork?
     
  4. Sep 12, 2011 #3
    Based on in information i have,

    Location of Project : Latitude- 26.9° N, Longitude- 72.0° E
    Size of Project : 20 KW
    Hourly Meteorological Data : Global Horizontal Irradiation, Direct Normal Irradiation, Diffuse Horizontal Irradiation

    I want to find out the possible generation of energy for that plant in KW. I have provided the hourly based meteo data.
     
  5. Sep 13, 2011 #4
    Here is the solution

    Total generation of units (kWh) = Insolation factor x Yield Factor x Total installed capacity
     
  6. Sep 13, 2011 #5

    Zryn

    User Avatar
    Gold Member

    Are your panels fixed? What is their orientation?

    How are you using the GHI, DNI and DHI to arrive at a value of Insolation, and is this data your own?

    Can you expand upon what Yield Factor incorporates?
     
  7. Sep 14, 2011 #6
    Yield factor is 0.89

    Little confused about using GHI, DNI and DHI values in my insulation calc. but i m using GHI in my calculation. I am not aware of how to use meteorological data here.

    I got this data from NREL website: http://rredc.nrel.gov/solar/new_data/India/nearestcell.cgi?
     
  8. Sep 14, 2011 #7

    Zryn

    User Avatar
    Gold Member

    Find out your Latitude & Longitude:

    http://www.whatsmygps.com/"

    Find your Insolation:

    http://eosweb.larc.nasa.gov/cgi-bin/sse/grid.cgi?email"

    1. Sign up (its free)
    2. Enter your Latitude & Longitude
    3. Select the data you want ('Average Insolation' only will suffice)

    You now have your average monthly Insolation.

    Alternatively you can calculate the contribution from GHI, DNI and DHI to your Hourly Insolation relative to the orientation of your solar panel(s) and get much more accurate specific site data, but if you don't need it, the NASA information is a good enough approximation.

    So if you have a 2kW system, and have 5 Hours Insolation, you can expect to get (2kW * 5H =) 10kWH from your system that day.

    I assume the Yield Factor is an expression of efficiency, so at 89% you would end up with (10kWH * 0.89 =) 8.9kWH instead.

    At $0.20 per kWH you would have made/saved (8.9kWH * $0.20 =) $1.78 that day!
     
    Last edited by a moderator: Apr 26, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Solar Energy Calculation
  1. Solar cell calculate (Replies: 3)

  2. Solar Calculator (Replies: 2)

Loading...