A free web tool for planners to design and optimize PV systems specifically using SolarEdge components . It includes AI-assisted 3D modelling and automated compliance checks.
A powerful calculation tool that is free to download (basic version) or use online. It generates detailed PDF reports and assists with cable sizing and performance comparisons. Specialised & Mobile Applications solar calculator software free download
For 2026, these are the most reliable free tools for solar PV calculation and system design: A free web tool for planners to design
Developed by the National Renewable Energy Laboratory (NREL), this desktop software is the gold standard for complex technical and financial modelling . It is free to download and ideal for in-depth feasibility studies and research. It generates detailed PDF reports and assists with
Widely considered the best overall free software for professionals. It offers end-to-end features including 3D rooftop modelling , shading analysis, and automated professional proposals with no licensing or seat fees.