Grid-Connected PV SystemsOff-Grid (Stand-Alone) PV SystemsSolar PanelsSolar Arrays Construction and MountingPV Combiner BoxesPV InvertersPV DisconnectsSolar panels used in PV systems are assemblies of solar cells, typically composed of silicon and commonly mounted in a rigid flat frame. Solar panels are wired together in series to form strings, and strings of solar panels are wired in parallel to form arrays. Solar panels are rated by the amount of DC that they produce. Solar panels should be ins...See more on eepower nrel.gov[PDF]
Photovoltaics: Basic Design Principles and Components - NREL
This publication will introduce you to the basic design principles and components of PV systems. It will also help you discuss these systems knowledgeably with an equipment supplier or system installer.