Sun Sizer

Sun Sizer Pro is a solar design toolkit for installers, DIY builders and off-grid homesteaders. Size the array, check the wiring, measure the site and hand the client a clean PDF — all on your phone, even with no signal on the roof. Everything runs on the device. No account, no cloud, no ads, and nothing you enter ever leaves your phone. DESIGN THE ARRAY • String Sizing — minimum and maximum panels per string from your coldest and hottest site temperatures, checked against the inverter's voltage window. • Inverter Match — DC:AC ratio, current per MPPT input and combiner checks. • Area → Panels — enter roof length, width and fire setbacks and see a to-scale layout of how many panels fit, in portrait or landscape. • Row Spacing — shade-free row pitch for a 9 am–3 pm window on the shortest day, now including sloped ground. WIRE IT SAFELY • Voltage Drop — AWG or mm², copper or aluminum, AC…