PROSTARMorningstar's ProStar is the world's leading mid-range solar controller for both professional and consumer applications. This second generation ProStar: Adds new features and protections using highly advanced technology - Electronic Protections: Short-circuit - solar and load; Overload - solar and load Provides longer battery life and improved system performance - 4 stages of charging Sets new standards for reliability and self-diagnostics - expect failure rate will be less than 1 per 1,000 units over 5 years.