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Free, NREL‑maintained desktop application for detailed performance modeling, financial analysis, and feasibility studies of PV and storage projects.
#3 PVsyst
Industry‑standard Windows software for PV system design, shading analysis, and long‑term energy yield simulation.
#4 HelioScope
Cloud‑based design platform that combines layout tools, module‑level modeling, and performance simulation for rapid proposal creation.
#5 Aurora Solar
End‑to‑end solar design suite with 3‑D modeling, shading analysis, and automated proposal generation for residential and commercial projects.
#6 PV*SOL
3‑D simulation software for PV system planning, offering detailed shading, temperature, and loss modeling with financial reporting.
Hybrid optimization model for renewable energy systems, supporting PV, storage, and backup generation with economic analysis.
Web‑based tool that leverages SolarEdge hardware data to size arrays, run performance simulations, and produce client‑ready reports.
Online platform providing high‑resolution solar resource data, yield simulations, and feasibility reports for large‑scale projects.
#10 RETScreen Expert
Free, government‑backed software for energy project analysis, including PV performance modeling, financial feasibility, and risk assessment.
#11 OpenSolar
Open‑source, web‑based solar design and proposal tool that integrates GIS data, shading analysis, and automated proposal PDFs.
#12 SolarDesignTool
Browser‑based design suite offering layout creation, module selection, performance simulation, and client‑facing proposal export.
NREL’s cloud service that provides quick PV energy production estimates via a simple API, useful for rapid feasibility checks.
#14 EnergyPlus
Open‑source building energy simulation engine that includes detailed PV system modeling for integrated building‑energy studies.
#15 SAM Web API
Programmatic access to NREL’s SAM engine, allowing developers to embed SAM’s modeling capabilities into custom applications.
#16 PVsyst Web
Hosted version of PVsyst offering cloud‑based simulations, data storage, and collaborative project sharing.
Lightweight desktop calculator for quick PV system sizing, loss factor analysis, and financial metrics.
#18 T*SOL
Specialized thermal solar system design software that also supports hybrid PV‑thermal modeling for combined installations.
#19 PVlib R
R language implementation of the pvlib functionality, offering similar modeling capabilities for users of the R ecosystem.
#20 SolarGIS
High‑resolution solar resource database with an online portal for site‑specific yield simulations and feasibility reporting.
Integrated design and proposal platform used by Sungevity installers, featuring automated layout, shading analysis, and client‑ready PDFs.