Grid-connected photovoltaic power system Solar energy gathered by photovoltaic solar panels, intended for delivery to a power grid, must be conditioned, or processed for use, by a grid-connected inverter. Fundamentally, an inverter changes the DC input voltage from the PV to AC voltage for the grid. This inverter sits between the solar array and the grid, draws energy from each, and may be a large stand-alone unit or may be a collection of small inverters, each physically attached to individual solar panels. See AC Module. The inverter must monitor grid voltage, waveform, and frequency. One reason for monitoring is if the grid is dead
Mir Docking Module Mir Docking Module The Stykovochnyy Otsek (, ), GRAU index 316GK, otherwise known as the "Mir" docking module or SO, was the sixth module of the Russian space station "Mir", launched in November 1995 aboard the . The module, built by RKK Energia, was designed to help simplify space shuttle dockings to "Mir" during the Shuttle-"Mir" programme, preventing the need for the periodic relocation of the "Kristall" module necessary for dockings prior to the compartment's arrival. The module was also used to transport two new photovoltaic arrays to the station, as a mounting point for external experiments, and as a