Posted by on December 7, 2012 in Solar Panels, Tips and How-To

Daily Yield – What’s this?

The daily yield of solar panels is the KWhs generated daily divided by the peak output (KWp) of the solar panels. So if your panels have a peak output of 4KWp and in a day they produce 20KWhs that would be a Daily Yield of 5.

Daily Yield is basically a measure of how hard the panels are working to generate electricity. Its going to be determined by the number of daylight hours and the time when the sun is shining high in the sky. So a daily yield of 5 could have been achieved by 5 hours of the panels working at their very best but its much more likely that it took say 12 hours of sunshine of varying strength to produce such a yield.
Why is Daily Yield so important to OnYourRoof.com?

What installers tell solar panel owners is the amount of electricity in KWhs they can expect from their system over the whole year. This is a good number to help you decide whether its worth buying the system in the first place but its of little help once your system is up and running. You have to wait at elast a year before you know whether your panels have performed as well as expected and even then its nearly impossible to prove that an annual KWhs output is due to the panels and not the weather .

Daily Yields allows OnYourRoof.com. users to compare just how well their panels are performing compared to other solar generators in their area. The Daily Yield number means that the size of your system doesn’t matter and by comparing only panels in the same area OnYourRoof.com also removes the variation in sunshine that the panels are receiving.
Daily yields also mean you can measure how well you panels are doing as frequently as you like. If there are many users in your area who enter their meter readings daily then you can compare your performance on a daily basis. However you can still get a lot of information from OnYourRoof.com even if you simply enter the quarterly readings you take to collect your Feed-In Tariff payment. We will provide an average daily yield for every month of the year provided users give us their readings every month.

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