This controller is the solarcontroller and switching power supplies together. There are 4conenct ports: one for solar panel, one for battery, one for load,one for electricity power.

This kind controller supply theload with solar power and electricity power. When the battery poweris not enough for the load, the controller auto switch to connectthe electricity power and supply the load with the electricitypower. 

This kind controller mainfunction is for solar power, the electricity power is a Supporting role.

This kind controller suitable forthe area that the solar energy is not very good. If you interest,please reply me for details.