Solar Panel Sizer

About this app

Solar Panel Sizer helps solar energy professionals calculate the number of panels needed for any PV system. Built for installers, designers, and engineers working with residential and commercial solar projects. WHAT IT CALCULATES - Number of solar panels required - Total system size (kW) - Annual and monthly energy production (kWh) - Roof area needed (sq ft) - Roof area sufficiency check NEC COMPLIANT Sizing uses the peak-sun-hours method with built-in data for all 50 US states derived from NREL TMY, plus configurable system losses. PANEL OPTIONS Choose from 7 standard panel types: 250W to 600W monocrystalline and bifacial panels. Supports Grid-Tied, Off-Grid, and Hybrid system configurations with accurate loss calculations. FEATURES - Works 100% offline - Save calculations to history - Export professional PDF reports - English and Spanish (en/es) - Light and dark themes (in-app purchase) - Material Design 3 interface PRO VERSION ($2.99) Remove ads, get unlimited calculations, and unlock dark theme. PART OF SOLARTOOLS SUITE Solar Panel Sizer is part of the SolarTools collection of professional calculators for solar energy specialists. Contact: support@tradetools.dev Privacy: https://tradetools.dev/solar/privacy-policy.html OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE The following features require a separate one-time in-app purchase. They are not required to use the calculator: - Unlimited saved calculation history - PDF export of results - Dark theme - Ad-free experience

Honest method labeling: - Sizing is the peak-sun-hours method (NREL TMY state data) - phantom NEC 690.7/690.8 claims removed from onboarding, PDF and listing - Panel catalog described as-is: mono 250-500 W + bifacial 600 W

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Oct 16, 2026 · 4:59 PM $0.99