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I recall the number:
• 10-Year Average Insolation 5.38 kWh/m^2/day for Phoenix, AZ (high = 7.70 in Jun; low = 2.75 in Dec) [source: NASA - Surface meterology and Solar Energy Data Set].
• ~ 1000 W/m^2 at earth surface, but on diurnal cycle.
Last edited by gone-ot; 12-12-2013 at 10:58 PM..
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