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-BRAND SUN POSITION database solar thermal monitoring free 3D SOLAR SHADINGS scientific Autocad Solar radiation USA Solar inverter portal multi-energy FREE ONLINE Online

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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SOLCAST provides live and forecast power and irradiance forecasts, plus low-uncertainty, satellite-derived historical time-series and TMYs. Visit SOLCAST website!

PVGIS (PV-GIS)
How to calculate the annual solar energy output of a photovoltaic system?
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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