The course gives an understanding of the core concepts necessary to work with both residential and commercial PV systems. Topics include system components, sit analysis, PV module criteria, mounting solutions, safety, and commissioning. Participants will learn the fundamentals of sizing a residential battery-less grid-tied system, wire sizing, over-current protection, and grounding. This session will also review fundamental design criteria for off-grid stand-alone systems including specifying batteries, controllers, and battery-based inverters.