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
Serial module turns out that a serial ring "R" is a finite direct sum of homogeneously serial right ideals if and only if "R" is isomorphic to a full "n"x"n" matrix ring over a local serial ring. Such rings are also known as primary decomposable serial rings . Serial module In abstract algebra, a uniserial module "M" is a module over a ring "R", whose submodules are totally ordered by inclusion. This means simply that for any two submodules "N" and "N" of "M", either formula_1 or formula_2. A module is called a serial module if it is a direct sum of