Top 20 Alternatives to NREL PVWatts in Solar Design & Proposal Software

Comprehensive performance and financial model from NREL, supporting utility‑scale, commercial, and residential PV projects.

Cloud‑based PV design tool that automates layout, shading analysis, and energy production estimates with visual reports.

End‑to‑end solar design platform offering 3‑D modeling, shade analysis, precise energy simulation, and proposal generation.

Industry‑standard software for detailed PV system sizing, shading studies, and long‑term energy yield simulations.

3‑D simulation tool for residential and commercial PV installations, featuring detailed shading and loss analysis.

Design suite integrated with SolarEdge hardware, providing layout, performance modeling, and quick proposal PDFs.

Web‑based planner that combines high‑resolution solar resource data with system design and financial analysis.

Clean‑energy management software that includes PV feasibility analysis, cost‑benefit, and emissions reporting.

Hybrid optimization model for micro‑grids that also supports detailed PV system design and economic evaluation.

Free, cloud‑based solar proposal platform that creates custom designs, shade analysis, and client‑ready presentations.

Web app for quick PV layout, energy output estimation, and downloadable proposal PDFs.

AI‑driven design software focused on large‑scale ground‑mount PV layouts, route optimization, and yield forecasting.

Automation platform that generates detailed 2‑D and 3‑D PV designs, shading analysis, and client proposals.

All‑in‑one design and sales tool offering site‑assessment, layout, performance modeling, and financing options.

Desktop application for PV system sizing, shading analysis, and financial modeling aimed at installers.

Simple online calculator that produces quick energy estimates and cost‑benefit summaries for residential projects.

High‑resolution solar resource mapping combined with design tools for performance prediction and reporting.

Platform for solar and storage design that includes detailed energy simulations, battery sizing, and proposal generation.

Tool for designing PV systems with Tigo optimizers and monitoring hardware, providing layout and performance forecasts.

Consumer‑focused calculator that estimates system size, production, and payback, useful for quick preliminary proposals.