Solar charge controllers and voltage regulators condition the power flowing from solar panels to prevent batteries from overcharging and undercharging. Ameresco Solar only stocks controllers that have been tested by Factory Mutual (FM) and Underwriters Laboratory (UL) and that have proven to be reliable in field testing. Our controllers for industrial solar power systems are approved for Class 1 Division 2 Group C and D hazardous areas and are available with data communication radio and generator starting relays for remote 48 VDC telecom hybrid sites.