Three-function Pulse-Width Modulation (PWM) controller for larger systems, providing reliable PWM solar battery charging or load control or diversion regulation. PWM technology controllers are ideal for use in solar energy situations where 36 or 72-cell PV modules are available and the site is unshaded with no physical space limitations. TriStar models incorporate advanced thermal design requiring no cooling fans, which ensures long-term reliability with no moving parts to fail– a unique feature among higher-powered controllers.