Keyboard commands will help speed up your design process. Without keyboard commands and shortcuts, designing a solar system in PVCAD can be more difficult.
Below are the basic keyboard commands needed to start drawing and defining polylines in AutoCAD.
Fig. 1 - AutoCAD commands, source: https://www.autodesk.com/store/autocad-shortcuts
If you wish to see a FULL list of shortcuts, please head over to AutoDesk to learn more.