Photovoltaic system to microgeneration and photovoltaic systems, and the US UL4703 standard, in subject 4703 ""Photovoltaic Wire"". A solar tracking system tilts a solar panel throughout the day. Depending on the type of tracking system, the panel is either aimed directly at the sun or the brightest area of a partly clouded sky. Trackers greatly enhance early morning and late afternoon performance, increasing the total amount of power produced by a system by about 20–25% for a single axis tracker and about 30% or more for a dual axis tracker, depending on latitude. Trackers are effective in regions that receive a large
Injective module group Q/Z and the circle group are also injective Z-modules. The factor group Z/"nZ for "n" > 1 is injective as a Z/"nZ-module, but "not" injective as an abelian group. More generally, for any integral domain "R" with field of fractions "K", the "R"-module "K" is an injective "R"-module, and indeed the smallest injective "R"-module containing "R". For any Dedekind domain, the quotient module "K"/"R" is also injective, and its indecomposable summands are the localizations formula_1 for the nonzero prime ideals formula_2. The zero ideal is also prime and corresponds to the injective "K". In this way there is a