Photovoltaic system in northern climes to 5.61 kWh/m²/day in the sunniest regions. For large systems, the energy gained by using tracking systems can outweigh the added complexity (trackers can increase efficiency by 30% or more). For very large systems, the added maintenance of tracking is a substantial detriment. Tracking is not required for flat panel and low-concentration photovoltaic systems. For high-concentration photovoltaic systems, dual axis tracking is a necessity. Pricing trends affect the balance between adding more stationary solar panels versus having fewer panels that track. When solar panel prices drop, trackers become a less attractive option. Systems designed to deliver alternating
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