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Thread: Calculating Solar Panel Efficiency

  1. #1

    Default Calculating Solar Panel Efficiency

    I am currently doing a project concerning the efficiency of a solar panel array. I have data concerning the power (kW), energy (kWh), and solar radiation (W/m^2). My problem is that I am not sure exactly how to calculate the efficiency of the panels. I can't seem to find a standard way to do this. Could someone please help me out?

    Appreciate it

  2. #2
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    Quote Originally Posted by whitehouse431 View Post
    ... the efficiency of a solar panel array. I have data concerning the power (kW), energy (kWh), and solar radiation (W/m^2). ... how to calculate the efficiency of the panels.
    Last edited by MarineLiner; 06-06-2009 at 09:38 AM. Reason: delete blank spaces

  3. #3
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    Efficiency is around 13%.
    Take a panel of mine for example.
    It is 1 meter x 600millimeters (0.6 square meter)
    It is rated at 80 watts peak in 1000 watts per square meter radiation
    80 watts divided by 0.6 gives 133 watts per square meter .
    133 watts at 1000 watts radiation is 13.3%.

  4. #4
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    Quote Originally Posted by Mosesbbhhh View Post
    Efficiency is around 13%.
    .....
    133 watts at 1000 watts radiation is 13.3%.
    Last edited by MarineLiner; 06-06-2009 at 10:15 AM. Reason: this post:

  5. #5
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    The way a solar panel efficency on earth is determined is by how many watts of power is produced in a square meter. 100% on earth is 1,000 watts per square meter. If a solar panel sizes is 2 square meters and the output of the solar panel at 68 degrees F. is 160 watts the solar panel's efficiency is 8%. Temp. and size is always a factor and the output of the panel. Now for the big question. Yes in space the math is different. The formular is 1,500 watts a meter because there is nothing to weaken the sun's energy in space. But Temp is also a factor always to consider.

  6. #6
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    Default Solar panel efficiency

    Quote Originally Posted by Mosesbbhhh View Post
    Efficiency is around 13%.
    Take a panel of mine for example.
    It is 1 meter x 600millimeters (0.6 square meter)
    It is rated at 80 watts peak in 1000 watts per square meter radiation
    80 watts divided by 0.6 gives 133 watts per square meter .
    133 watts at 1000 watts radiation is 13.3%.
    Im requesting anyone to suggest which type of equipment or setup I need to measure the actual solar panel efficiency, for example a 120W silicon solar panel

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    Default Test Question on calulating solar panel efficiency

    I am trying to write a test question related to a brief course on pv. I have the following information, can someone help me understand the calculation?
    The question reads: What is the efficiency of a panel that measures 1m x 1.5m and is rated at 222P max?

  8. #8
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    Panel efficency is generally rated by exposure to a known source.
    Look up words like INSOLATION sq meter

  9. #9

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    hey guys last time I have 12.25kw mounted on my roof facing slightly south of east. Conditions such as temperature and weather affect your output. I can say that in NJ at a lattitude of 41 degrees averaged over the year each one KW of panels produced 1400-1480 KW-hours/year. The longest days have 16 hours and the shortest have 6 hours. My bill has been zero for the year.
    Last edited by russ; 09-16-2011 at 09:32 AM. Reason: removed link

  10. #10
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    Quote Originally Posted by whitehouse431 View Post
    I am currently doing a project concerning the efficiency of a solar panel array. I have data concerning the power (kW), energy (kWh), and solar radiation (W/m^2). My problem is that I am not sure exactly how to calculate the efficiency of the panels. I can't seem to find a standard way to do this. Could someone please help me out?

    Appreciate it
    how we calculaitng solar panels efficiency

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