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CM20D Solar Charge Controller

 CM20D controller is a kind of intelligent, multi-purpose solar charge and discharge controller. Fixed LCD display with a very friendly interface is used in this product; various control parameters can be flexibly set, fully meet your various application requirements.

  1.Vivid LCD graphic symbols                    

  2.Simple button operation

  3.Automatic Identification of System Voltage level  

  4.Intelligent PWM charging mode

  5.Automatic Temperature Compensation (custom)  

  6.Adjustable charge-discharge control parameters

  7.Settable Operating mode of Load               

  8.Battery reverse-discharge protection

  9.Battery Low Voltage Disconnection (LVD)        

  10.Battery reverse connection protection

  11.Overcurrent protection.    

 Description of LCD graphic symbol:


P1:Digital parameters. 

P2:Charging indication. This symbol indicates that the  solar panel is charging the battery; without this symbol means solar panel can not charge the battery because of low voltage. If the symbol is flickering, means the battery is fully charged and has entered float charging state. 

P3:Indication for solar panel. This symbol indicates that the connection of solar panel is detected by controller; without this symbol means the connection of solar panel can not be detected, or there is no sunshine on the solar panel.

P4:5 bars battery power indication.

P5:Discharging indication. This symbol indicates that controller is in output state, otherwise not in the output state. The flickering of this symbol indicates the damages of internal control devices.

P6:load indication. This symbol indicates that controller is in output state, otherwise not in the output state. The flickering of this symbol indicates overload or the damage of the load. 

P7:A stands for the unit of current; H stands for hour.

P8:V stands for the unit of voltage.

Technical Data

Rated current10A12V24V20A12V24V30A12V24V
Rated voltage12V/24V Automatic Identification
Voltage of solar panel50V
Floating charge13.8V/27.6V
Under-voltage protection10.7V/21.4V
Under-voltage recovery12.6V/25.2V
Boost voltage b01 Sealed 14.4V/28.8V(Duration2hours)
b02 Gel14.2V/28.4V
b03 Flooded 14.6V/29.2V
Open circuit losses13mA
Charge and discharge voltage drop0.2V|0.1V
Charging modePWM mode
Temperature compensation-4mV/Cell/to be customized
Specification of the cables5#  AWG  (6mm2)
Working temperature-20~60
Storage temperature-30~70
Temperature requested90,No condensation
Dimension88 mm×160 mm×37 mm
diameter of mounting hole64 mm×150 mm --Φ5


①  Get ready for tools and cables. Advising you to matching the right cables. Ensure that the current density <4A/mm2  that is conductive to reducing the line voltage drop. Recommendation: 30A with 10mm2 cables. Check whether the installation sites compliance with the relevant safety requirements. Please avoid the damp, dusty, there is a place flammable, explosive and corrosive gases use the controller to install.    
② Install the controller into a fixed vertical plane. See section 5 of the pore size and pore spacing. In order to ensure a good thermal control conditions, please set aside each 10cm below the controller space.
③ As shown on the right, connect the (1) Load, (2) Battery and (3) Solar Panel to the controller according to the order of (1) (2) (3). Pay attention to the load, battery, solar panel and controller of same polarity.
④ Put the external temperature sensor into the left of the controller (probe port). The temperature sensor should be placed at the similar space of the battery. (Otherwise, the controller will control the parameters of all wrong temperature compensation.)
⑤ If you have remote monitoring and control function, please insert one end of the included communication wire on the right of the controller (communication port), the other end to connect to the host computer.

demolition:To prevent accidents, please order the demolition of solar panels, battery and load disconnect with controller.
Note:Battery polarity will not damage the controller, but you will have a load equipment security risks.



ModelCM2024ZInstalltion cable area≤7#  AWG  (6mm2)Operating temperature-25℃~60℃Storage temperature-35℃~70℃Humudity requirements≤90%,no condensationSize168 mm×88 mm×34 mmMounting hole spacing68 mm×159 mm --Φ4Weight275g


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