SolarGIS

High resolution solar radiation database developed from Meteosat MSG data. Available for Europe, North Africa, and Southwest Asia through the SolarGIS web portal.
SolarGIS

multi-energy Solar radiation USA FREE ONLINE scientific monitoring solar thermal Smartphone SUN POSITION 3D SOLAR SHADINGS MULTI-BRAND database PRO apps PV forecast SOLAR RADIATION

Voltage drop

Computation of losses in solar wires :

Calculator : AC and DC electrical wire voltage drop and energy losses

PVGIS

Free online calculation and simulation of solar photovoltaic electrical power in Europe, Asia and Africa

PVGIS online worlwide solar simulator

PVwatts

Solar electricity simulator : free worldwide online calculation of solar photovoltaic power

PVWatts the US simulator

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Solar energy research at NREL includes photovoltaics, concentrating solar power, solar grid and systems integration, and market research and analysis. Visit NREL website!

How to calculate the annual solar energy output of a photovoltaic system?
PVGIS (PV-GIS)
Electricity losses online calculator : AC and DC electrical wire voltage drop and energy losses
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How to get solar radiation and climate data (precipitaton, temperature, wind, insolation...) anywhere in the world free from NASA database?

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