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Positive Tolerance of PV modules

Discussion in 'General Electronics Discussion' started by Syed Waqar Ali, Oct 12, 2017.

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  1. Syed Waqar Ali

    Syed Waqar Ali

    Jan 13, 2016
    Hi Everyone!!

    Hoping that you all would be fine, i have a little query to share with you..

    " Why PV modules (Solar panels) always available with Positive tolerance instead of +/- tolerance "
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Tolerance with respect to which parameter?
  3. Syed Waqar Ali

    Syed Waqar Ali

    Jan 13, 2016
    Power Wattage ratting i.e a PV module of 265 watts rating
  4. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    I think it must have something to do with marketing. You wouldn't sell a can of beer as being 32 ounces plus or minus one ounce. No, you would make sure that can contained at least 32 ounces. Same-o same-o with solar panel modules. If you advertise your module as producing 300 watts under optimum lighting, it better have a positive tolerance such that any panel sold will produce at least 300 watts under optimum conditions.
    Harald Kapp likes this.
  5. Syed Waqar Ali

    Syed Waqar Ali

    Jan 13, 2016

    Yes... it seems like that
    Thank you very much for your support :)
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Typically a good solar panel will have a guaranteed output. To ensure this, the output power will typically be higher.

    For example, a 300W panel may be nominally 330W, with a range of outputs between 300 and 360W. So rather than calling it 330+/- 10%, they will guarantee 300W and specify that the panel may be up to +20%.

    It's actually more complex than this because the guaranteed output will also be over time and the output will fall over time, so these things must be taken into account to allow for (say) a guaranteed output of 80% of the retreat output after 15 years.
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