The C40 has long been the mainstay of Xantrex's charge controllers because of it versatility and reliability. The C40 is a 100% solid state, microprocessor-driven controller which is UL and cUL listed. The C40 controller may be configured for solar panel battery charging, or DC load control (e.g. low voltage disconnect) or DC diversion operation (e.g. wind turbines and hydro generators). Whatever the charging source, the C40 Xantrex Charge Controller is sure to meet your DC controller needs.