PV Designer software enables you to draw roof outlines, specify set-backs and keep-out regions, incorporate SunEye shade measurements at specific locations on the roof, drag-and-drop modules, size strings, check inverter limits, and calculate the AC energy production for your system quickly and easily. It includes extensive world wide databases of modules, inverters, and historical weather. You can easily try different design scenarios and compare their AC kW-h outputs side-by-side to identify the best design. Results can be exported to a PDF and included as part of your project proposals. PV Designer is optimized for designing residential systems but will also accommodate small commercial systems up to 100 kW. The software is easy to learn and easy to use, yet enables detailed analysis on par with more complicated and expensive engineering tools. PV Designer runs on most MS Windows operating systems.