Features:
Stylish design in appearance, large power density
Overcharge of Storage Battery: Automatically turn off the charge to storage battery when the charging voltage is higher than the protection voltage
Protection for Reverse Connection of Solar Cell£ºAfter correction of reverse "+" "-" polarity , the solar cell can be used
Protection for overdischarge£ºWhen the voltage of storage battery is lower than the protection voltage, the controller automatically turns off output to prevent the storage battery from damage
Protection for the Open Circuit of Storage Battery: In case of open circuit of the storage battery, the controller will limit the voltage between the two terminals of the load to prevent the load from damage when the solar cells normally supply power;
Protection for Overvoltage of Load: When the voltage is much higher, the output is automatically turned off to prevent electrical equipment from damage;
Delay Action£ºThere are delay actions for overcharge, overdischarge and overvoltage to avoid malfunction;
Three-stage Charge: automatic switch of equalized charging and floating charging to ensure the storage battery is always at the fully charged status, making good use of electric power;
Temperature Compensation: There is temperature compensation for overcharge protection recovery point voltage and floating charging voltage with external temperature sensor.
Fourth generation high speed MCU control
Anode ground technology
Enhanced reliability with hardware dongle
LCD multi-screen display of operating status and parameters
LED indicating status of ways of photovoltaic and power supply
Turn off/on control in successive
6 or 12 ways of photovoltaic control
Flexible setting of digitized control parameters
Password control in modification of parameters
Failure event record
Cumulate record of generated electric power and electric power consumption
Malfunction alert with contact output
Nonvolatile storage of parameters
Real time system clock
Oil engine/ public power supply control function
Minor load control function
Street lamp function (on/off by optic mode, on by optic and off by clock mode, clock control mode)
RS232/485 communication interfac
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SOLAR CONTROLLER
Whenever batteries are used in a renewable system we need a controller to prolong battery life. The most basic function of a controller is to prevent battery overcharging. If batteries are allowed to routinely overcharge their life expectancy will be dramatically reduced. A controller will sense the battery voltage, and reduce or stop the charging current when the voltage gets high enough. This is especially important with sealed batteries where we can't replace the water that is lost during overcharging.
Most PV controllers simply open the circuit between the battery and PV array when the voltage rises to a set point. Then, as the battery absorbs the excess electrons and voltage begins dropping, the controller will turn back on. With some controllers these voltage points are factory preset and nonadjustable, while others can be adjusted in the field. Many PV controllers use a relay, a mechanically controlled set of contacts, to accomplish this. Controllers of our enterprise use power transistors and PWM (Pulse Width Modulation) technology to rapidly turn the circuit on and off, effectively floating the battery at a set voltage. PWM controllers have the advantage of no mechanical contacts to burn or corrode.
Controllers are rated by how much amperage they can handle. Exceeding these amperage ratings will cause your controller to turn into a crispy critter. It's okay to use a controller with more amperage capacity than you are generating.
A PV controller often has the additional job of preventing reverse current flow at night. Reverse current flow is the tiny amount of electricity that can flow backwards through PV modules at night, discharging the battery. With smaller one or two module systems the amount of power lost to reverse current is really negligible. A dirty battery top will cost you far more power loss. Only with larger systems of four modules and up does it become anything to be concerned about. Much has been made of reverse current loss in the past, and almost all charge controllers now deal with it automatically. Most of them do this by sensing that voltage is no longer available from the modules, when the sun has set, and then opening the relay or power transistor. A few older or simpler designs still use diodes-a one-way valve for electricity-to accomplish this, but the relay, or the power transistor, has become the preferred method. (See sidebar on Dinosaur Diodes.)
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