About the app PV Tools is a new iOS app built for solar installers and electrical technicians. It includes a range of professional calculators for daily field use: • DC/AC short-circuit current (Ics) • 80 % rule for circuit-breaker sizing • Voltage rise / grid backfeed (spanningsopdrijving) • Open-circuit voltage (Uoc) and operating-voltage check • Yield estimation based on panel efficiency • Data-sheet lookup for inverters and optimizers • Optimizer compatibility between brands • Upcoming: voltage-drop calculator, string configuration, battery sizing Widget support Multi-language support: English, Dutch, German, Spanish, Portuguese. If there’s demand, more countries and languages (e.g. French, Italian, Scandinavian) will be added. Built entirely in SwiftUI, lightweight, accurate, and designed for real-world PV professionals.