A Controller for Virtually any DC Charging Source. The C60 is a fully solid state, microprocessor-driven controller that is UL and cUL listed. C Series controllers may be configured for PV battery charging, or DC load control or DC diversion operation. Whatever the charging source, a C Series controller is sure to meet your DC controller needs. Silent Microprocessor Control-All C Series controllers have a powerful microprocessor at their core which increases system performance and maximizes battery life. They are fully solid state and operate silently.