We often hear: "the cheapest energy, is the one we do not use ...." one should add "or the one that is free!" On this basis, it is necessary to place the largest surface of solar collectors to obtain more free energy. Yes, but ... "Larger the solar system is, the more expensive it is!"
Optimum Sizing™ is the technique used to achieve the optimum economic sizing for solar installations, taking the parameters of the thermal solar system into account. In most cases, the size of a solar system is directly limited by the overheating problem of the installation in summer (classical system "under pressure").