A quick and accurate solar design software
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Computation of losses in solar wires :
Calculator : AC and DC electrical wire voltage drop and energy losses
Worldclimate (USA) gives Worldwide rainfall and temperature database (85000 sites). Worldclimate
Free online calculation and simulation of solar photovoltaic electrical power in Europe, Asia and Africa
Solar electricity simulator : free worldwide online calculation of solar photovoltaic power
EASYSOLAR solar software 7 days trial for free
Solar photovoltaic applications for smartphone and tablet