Hillbilly Heaven
Explorer
I agree about the hall effect sensor. I have one in my Fluke 376FC AC/DC clamp meter and it works great. However, trying to find one you can install in a system with meters that can read it is, another story.
Pat
There are many available that are either 5vdc or 12vdc powered with a 2.5vdc + or - 2vdc output. Meaning that zero amps is 2.5vdc.
Be careful doing this. 12V from the car has considerable current available what may exceed ampacity of many solar controllers.
That is why you use a breaker and wiring between the 12vdc source and the charge controller rated for the max of the charge controller.