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How do I select Lithium batteries in the MP3741 or MP3749 Solar controllers?

Updated

The MP3741 20A and MP3749 60A solar controllers are set to charge Lead-Acid batteries by default. You can configure them to support Lithium 12.8v or 25.6v batteries instead as follows:

  1. Connect the controller to the battery
  2. Tap the Select button until you get to the Battery Voltage display
  3. Press and hold the Enter button until the display blinks SEL
  4. Tap the Select button until you get to F04 (suits 12.8v batts) or F08 (suits 25.6v batts)
  5. Tap the Enter button to lock in the change.

See the video for the process.

 

My MP3741 20A does not have F04 or F08 in the Battery menu

If your MP3741 does not have F04 or F08 in the menu as shown above, you will need to update the firmware in the unit as follows - if you do not have the black USB cable, it is available as MP3747:

  1. Place the controller and a 12v battery next to a Windows PC you will use to update it.
  2. Connect the negative battery wire from the controller to your battery negative
  3. Have the battery positive wire ready to connect - a switch would be best for this
  4. Download this file to a Windows PC
  5. Extract the files inside the ZIP to a folder on your PC 
  6. Open CH343SER-USBDriver, browse to your Windows version and run the Setup file inside  
  7. Click through Setup until it is complete
  8. Plug in the black cable with the network plug to the controller, and USB plug to the PC
  9. Right-click the Windows icon in the Taskbar, then click Device Manager.
  10. Check the COM port is installed in Device Manager and note the COM number (3, below)
  11. Double-click the PrgUpgrade file
  12. Press Load Proram and select the file "ST_TracerAN_V201.prg"
  13. Select the COM port your PC installed, and press Open
  14. Connect the controller positive wire to the battery positive 
  15. The program should show a progress bar, and end looking like this

You can now disconnect the cables, and the controller will have F04 / F08 when reconnected

 

 

My MP3749 60A does not have F04 or F08 in the Battery menu

If your MP3741 does not have F04 or F08 in the menu as shown above, you will need to update the firmware in the unit as follows - if you do not have the black USB cable, it is available as MP3747:

  1. Place the controller and a 12v battery next to a Windows PC you will use to update it.
  2. Connect the negative battery wire from the controller to your battery negative
  3. Have the battery positive wire ready to connect - a switch would be best for this
  4. Download this file to a Windows PC
  5. Extract the files inside the ZIP to a folder on your PC 
  6. Open CH343SER-USBDriver, browse to your Windows version and run the Setup file inside  
  7. Click through Setup until it is complete
  8. Plug in the black cable with the network plug to the controller, and USB plug to the PC
  9. Right-click the Windows icon in the Taskbar, then click Device Manager.
  10. Check the COM port is installed in Device Manager and note the COM number (3, below)
  11. Double-click the PrgUpgrade file
  12. Press Load Proram and select the file "OEM_SZB_TracerAN_ARM_V4.2"
  13. Select the COM port your PC installed, and press Open
  14. Connect the controller positive wire to the battery positive 
  15. The program should show a progress bar, and end looking like this

You can now disconnect the cables, and the controller will have F04 / F08 when reconnected

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