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
Poisk (ISS module) Poisk (ISS module) Poisk (; lit. "Search"), also known as the Mini-Research Module 2 (MRM 2), , or "МИМ 2", is a docking module of the International Space Station. Its original name was Docking Module 2 ( (SO-2)), as it is almost identical to the Pirs Docking Compartment. Added in 2009, "Poisk" was the first major Russian addition to the International Space Station since 2001. Poisk is overall the same design as a docking module Pirs. Whereas Pirs has been attached to the "nadir" ("bottom") port of "Zvezda" module, Poisk is attached to the "zenith" ("top"); Pirs is closer to