Solar Charge Controllers For Street & High Mast Lighting

(Dounload PDF McUD81M & McUD171M& McUD271M)

1. McUD81M for loads from 6w-18w with solar pv panel support of 12v/100w,
2. McUD171M for loads from 24w-40w with solar pv panel support of 12v/200w,
3. McUD271M for loads from 40-60w (max 75w) with solar pv panel of 24v/400w

  • Auto Dusk to Dawn Operation
  • Built-in High Efficiency LED Driver
  • User Selectable Output Load 6W/9W/12W/18W
  • User Selectable Multiple Dimming And Timing Options
  • 100Wp panel Input
  • Microcontroller Based Design
  • PWM Charge Mode
  • Low Loss Shunt Regulation
  • Temperature Compensation (optional)
  • Suitable For Lead Acid, Lithium Ion, LiFePO4 Battery

Introducing for the first time:

Motion sensor input can be directly fed to this controller. Motion sensor detects the motion of human being when in the predetermined periphery. If the lamp is in dimmodewhen such a motion is detected, it will automatically switch to full brightmodetill the motion is there followed by a delay of one minute.

This feature is useful for general power saving and also for security purpose. The controller comes with preinstalled software for entire operation. On-board provision ismadeto supply the power to the motion sensor and to accept the signal frommotion sensor.

The controller works in its normal operations, if no sensor is used. Motion sensor can be added as and when needed.

McUD81M is an automatic dusk to dawn controller designed with the latest state-of-art microcontroller based technology for providing highly accurate, easy and economical solution to the OEMs making Solar LED street lights.

It is unique to be able to drive any load right from 6W to 18W with simple links provided. If you have different types of solar street lights requirement like 6W, 9W, 12W or 18W, the same controller can be used by simple link provided on board.


Also, it can be configured by OEM to make it operate in any of the options below-

  • Plain dusk to dawn operation with constant illumination throughout the night.
  • Selectable automatic switch over to dimming mode after programmable (factory set) delay timings of 4 hours, 5 hours or 6 hours
  • Selectable automatic shut down after programmable (factory set) delay timings of 4 hours, 5 hours or 6 hours
  • Automatic dimming to 50% of full illumination after the selected delay time.
  • Unique program profile on UNQ pin: First 5 hours full light, next 5 hours 30% light, remaining hours till dawn it is full light. Practically, very useful and saves the power to reduce panel and battery capacity for a given autonomy.

Any other delay or dimming can be set as per user needs subject to MOQ.

Additional Features:

  • The controller comes with unique No-Battery protection. If only panel is connected without battery (or fuse is blown), the entire circuitry is disabled. This is useful at the time of installation where panels and housings are installed first and batteries are fitted later.
  • During instances of lightening in monsoon, it does not switch off instantly.. It has time delay of 10 sec for switching off the lights. So you get uninterrupted light even during lightening at night.
  • The controller is given conformal coating for protections against ambient hazards like high humidity or polluted air.

Since the single kit can be used for normal dusk to dawn operation or with delayed off or with delayed dimming to drive not only one type of load but 4 different ones, you save on the inventory. It is truly universal kit of its kind available.



Turns on when panel voltage is more than 13V to indicate positive charging, It starts flickering when battery is charged and goes in PWM mode of absorption.


  • Turns Red when battery reaches LVD and disconnects the load.(BAT LOW)
  • RED turns on and off if battery voltage is between LVD and LVR (BAT RESERVE)
  • Turns Green when battery is HEALTHY (between LVR and HVD)
  • Alternates Red and Green when battery >HVDD . Load is disconnected. Charging is disabled.


On board connector marked PV+, PV-, BT+, BT-, LD+ and LD- to make connections to respective inputs and outputs.

Note: LD+ and LD- are load terminals which here are to be connected to power LED cluster in fixture directly. The output is SMPS suitable to drive with constant current upto 2 Amax drive irrespective of battery voltage between HVD and LVD thereby maintaining the constant illumination from fixture. The LED drive current is set to desired value as per requirement with links provided on kit.


6WAY 2PIN : For Mode selection, see CUSTOMIZATION page 6.

3-WAY 2-PIN : For Load selection, see CUSTOMIZATION page 6.


SYSTEM : 12V Nominal
CAPACITY : Input Panel 100Wp max
REGULATION : Low Loss, Shunt Type, PWM
BATTERY OPERATION : 12VTubular 11.1V LiIon
DUSK_SENSE : Panel Voltage < 1.5V
DAWN_SENSE : Panel Voltage > 3.0V
ON BOARD FUSE : 6A, Fast Blow
APPLICATION : In Fixture Use Only
DIMENSIONS : 92L X 80W X 30H mm
PROTECTIONS : * Short Circuit / Overload
* Reverse Battery and Panel
* Reverse flow of current from Battery to Panel during night
* Lightening

Battery type /configuration must be communicated for requisite set points.


3WAY CONNECTOR “MS” has two pins marked GND and VCC which supplies 5V DC to the motion sensor unit McMS, Pin marked 'IN' accepts digital input to activate bright mode during dim operation for 1 min after motion is stopped. Please note it works in UNQ mode only (default setting) Motion sensor unit can be had separately if needed. Please refer to data sheet of our motion sensor McMS for more details on page 7 at the end of this brochure.

Only Technically skilled person should make connectiond to the controller

Controller uses sensitive devices on board. Due precaution should be taken while handling it.

No Soldering / desolding should be done on board.


You can check the performance of controller with the procedure outlined below.
Components needed to carry out these tests are Digital Multimeter, Dual Output (Independent) Variable Power Supply (CVCC) with volt/ampere display, Electronic load, 1.5 sq mm cable lengths for connections, DSO to see waveforms (not needed for routine check)


  • First connect the cables to BT+ and BT- securely to the respective terminals of power supply.
  • Gradually increase the supply such that voltage is just above LVR. BT_STS will turn Green. Reduce the voltage slightly and BT_STS will show Green plus flickering Red both together. Reduce voltage further to LVD. BT_STS will now be fully Red.
  • Increase voltage slightly, BT_STS will show flickering Red only. This completes LVR and LVD check.
  • Increase voltage to more than HVDD. BT_STS will alternately turn Red and Green. This indicates the system is disabled and voltage will not be available to the load.
  • Switch off the supply and now connect with other pair of cables PV+ and PV- to respective terminals of other part of power supply.
  • Put battery voltage to LVR and gradually increase voltage to PV terminals. Battery voltage will track the PV voltage when battery voltage is more than LVD. CHRG indicator will now turn on. Increase PV till battery voltage reaches HVD. Now CHRG will turn on and off alternately. This will continue till voltage is HVDD Afterward, system is disabled.


  • Above tests in the same sequence can be carried with load connected to the controller.
  • If electronic DC load is not available, connect your assembled power LED cluster to respective terminals of LD output.
  • Depending upon the load used, select LOAD_SEL pin to match output current.
  • Put the link on NML or TM1, TM2, TM3 or UNQ on MODE_SEL connector.
  • Keep battery voltage to at least LVR and panel voltage to 0. Load will be on. You can check the output current of battery. Please note this is not the actual current passing through the power LED cluster. This is the battery current at the instantaneous battery voltage. If battery voltage is increased, this current will be reduced and vice-a-versa. This indicates the proper working of SMPS driver.
  • If you connect a precision current meter in series with LED load, the current indicated will be constant even if battery voltage is varied up and down.
  • Remove link and put it on DIM. Load current indicated will be half of previous reading.
  • UNQ or TM1/TM2/TM3 operations can be checked only in real time environment.
  • When battery voltage is above LVR and load is on, increase panel voltage gradually to slightly above 3V. Wait for 10 sec and load will be off. Now gradually reduce panel voltage to slightly less than 1.5V and load will be on again in. This completes DUSK_SENSE and DAWN_SENSE settings.
  • When battery is connected for the first time and it is above LVR, load will be on after 10sec. This stabilization delay is software generated only for the first time connection.



You can select how controller should work in different dimming options. Two short links are provided with each unit for this operation. Depending upon your requirement, these two pins or single one need to be used. You should strictly adhere to the table given below to select any one mode out of 8 modes mentioned. Erroneous or extra connections other than suggested at these pins will result in unpredictable performance.





Motion Sensor Add_On Module


McMS is available as add_on module for connecting to the main charge controller unit.

It comes with 3 way relimate connector to be directly plugged in the main unit which has 3-way base provided exclusively for this module.

The main charge controller is preinstalled with the software for its operation in UNIQ mode.

Required supply for this module is provided by main controller.

Technical Specifications:

  • Operating voltage: 5 to 15V
  • Quiescent current: 50uA
  • Level output: 3.3V Hi, 0V Lo
  • Block time: 5sec
  • Sensor Angle : 110 0
  • Board dimensions: 32x24mm
  • Lens Dia: 23mm
  • Operating temp: -15 to 700C


  • Although the module has user accessible settings like, selection of single pulse or multiple pulse, delay time and sensitivity, it has been configured optimally to be compatible with the software installed on the main controller unit. And we strongly recommend not to disturb the factory settings done.
  • Fiddling with the settings will result in unpredictable working.

Instructions for use:

  • The module is electrostatically sensitive. Only technically competent person should handle it.
  • It is provided with relimate cable with standard length of 12”.
  • It directly fits into connector marked MS on the main controller. Power is provided to the module and signal is received from the module from the same connector.
  • The module needs about 60 sec to stabilize for operation. During this initialization, it will toggle output for 3 times. Once stabilized, it will go into normal mode of working.
  • Module has dual probe sensor placed at rectangular window. If movement is along this length, the sensitivity is excellent. Place the module such that movement is along its length.i.e human movement should be parallel to its length for best results.
  • If the movement is facing the sensor, or from its width, sensitivity is reduced.
  • In the optimal direction, sense distance is 5 to 7 mtr.
  • Avoid direct sunlight or heavy winds on the module which will result in malfunction.
  • Please note, it works in UNIQ MODE only (default setting). Please ask for operation in other mode

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