Free Solar PV Calculators, Design Tools and Software

List of solar PV calculators, design tools and software, Use to calculate solar power yields and the Return on Investment (ROI) for solar PV systems.

Best Free Solar PV System Simulation & Design Software (2026)

Our team at Engineering Passion has researched solar design

Designer

Get the most out of the solar system with automatic electrical design calculation providing you with the best recommendation for highly efficient solar system

PVWatts Calculator

Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to

PV*SOL online

We then search for the optimal connection of your PV modules and the inverter that suits best. After the simulation of the system, the results are presented: Annual

Top 10+ Best Solar Power & Design Software Tools for PV Installers:

Choose solar software that offers detailed performance reports, system efficiency calculations, and financial breakdowns to provide customers and stakeholders with comprehensive

ProSolar

Calculate solar panels, inverters, batteries, and electrical components. Get accurate sizing for off-grid, on-grid, and hybrid solar installations.

SolarMathLab | Accurate Solar Calculators for Panels, Batteries

Design smarter solar systems with our technical calculators for panels, batteries, inverters, tilt angles, irradiance, wiring, and hybrid PV setups. Perfect for engineers, students, and DIY solar projects.

Solar Generation Calculator Guide: Compare Tools & Calculate

Complete guide to solar generation calculators. Compare PVWatts, Google Sunroof & more. Learn to calculate accurate solar panel output with expert tips.