Below is a list of free solar calculators that can be used in the design of solar PV systems. These calculators are free to use or download, all excellent resources for anyone looking to install or understand more about solar PV systems.The PVGIS Estimation Utility is a great way to understand a proposed solar PV system’s relationship with the sun based on it’s location. If you have an understanding of this relationship as well as access to the historical solar radiation data for your location that the PVGIS provides, you can prepare power output estimates (kWh), optimize system designs, and have a very good idea of how a solar PV system will perform at a given location before a solar PV system is commissioned.
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