DC series of solar power controller is a small-looking appearance (a small dimension) products ,easy installation .It adopts the advanced electric controlling technology to transit the solar power into the electric power  for electrical appliance ,and can keep the superfluous  power in the cell ,The intelligent CMOS chip inside can control the real time ,display the working  status and provide muli-protection ,it is one time ,display the working status and provide muli-protection ,it is one of  the best controllers for solar power system to charge and discharge .
input voltage :DC16-20V
Outout voltage :DC13.8V
Polarity counter -protection
overload and short -circuits proection
over-charge and over-discharge protection
solar power module polarity counter -protection
current flow-backwards protection