Resources

Weather and solar resource data sources

• European Union - Photovoltaic Ggeographical Information System A free and very detailed production modeling, system design tool and source for weather data that works in most locations globally. Also available in Spanish, French, and Italian.
• National Renewable Energy Laboratories - PVWatts A free production modeling and system design tool from the National Renewable Energy Labs (NREL) that works in many areas around the world. Only available in English.
• NASA - Power Data Viewer A Detailed global irradiance/meteorological resource provided by the National Aeronautics and Space Administration (NASA) that provides data globally. Capable of exporting data sets and creating unique maps. Only available in English.
• World Bank - Global Solar Atlas A detailed global irradiance/meteorological data resource. Also includes a free production modeling tool. Only available in English.

Wiring resources

• Caculator.net - Voltage drop calculator A simple voltage drop calculator that can be used to quickly determine the percentage of voltage drop for a particular circuit with basic information.
• Smartgauge.co.uk - Battery bank configurations An excellent article on voltage drop and battery wiring with simple diagrams showing good and bad wiring practices for various different battery bank configurations.