There is no single answer to this, of course, as it depends on the solar panel’s properties and location. To calculate it, you’ll need the solar panel’s rated power, lifetime (it will come with a warranty that often covers over 20 years), insolation (amount of light the given location receives – there are maps available), and actual angle of the panels. There are calculators available online, although they are mostly centered on determining the money savings, such as this one http://www.nrel.gov/rredc/pvwatts/
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