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Average Solar Radiation & Hours per year Assumptions
Solar Radiation available to PV collectors is measured as peak solar radiation at 1000 W / m2 per hr.,
and reported as xx hrs peak solar radiation per day per year
which varies at different parts of the world, for example:
Paris = avg. 3.34 hrs / day or 1219 hrs/yr,
or 51 - 24 hr days/yr, or 14% of a year
This is the northern latitude average, and includes Toronto, Korea, etc.
Las Vegas = avg. 5.68 hrs / day or 2075 hrs/yr,
or 86 - 24 hr days/yr, or 24% of a year
This is the US "sun belt" average.
2010+ 2015 2016+ Comparisons