Tag Archives: solar controller

How the CMTPO2 solar charge controller works. | how to use a cmtpo2 solar panel controller

I bough a solar panel which came with a CMTPO2 charge controller.

Unfortunately the instructions were difficult to understand, and faultfinding was impossible, so I have written this post to give you a quick understanding. 

Relate the letter in the below picture to the functions.

a.

  1. Solid green light: This means its collecting energy from the sun and charging
  2. Flashing green light: This means it collecting energy from the sun but no required as batteries are full and not required by load device.

b.

  1. Three solid red lights: Batteries are full
  2. Two solid red lights: Batteries are half full
  3. One solid red light: Batteries are approaching empty
  4. Flashing red light: Batteries are dead not providing any power

c.

  1. Solid green light: There is a device connected and drawing power.

d.

  1. Connecting the device which requires power.

e.

1. Connection to the battery

f.

  1. Connection to the solar panel.