Basically the solar controller can be divided into five types: In parallel type, tandem type, PWM type, intelligent type and maximum power tracking type.
Parallel type controller: When the battery is fully charged, it will use of the electronic components of the solar array output shunt to the internal resistor in parallel or power module, and then burn up in the form of heat.
Tandem type controller: Use of mechanical relay control the charging process, and cut off the solar array system in the night.
Intelligent controller: Use the single chip which with CPU control to collecting the parameters of solar power supply system.
: When charging it will judgment and find the maximum value of the output power of solar panels. Ensure solar panels always run in the maximum power point, make full use of the energy output of solar panels.