Machineman
Member
I have a cheap solar charge controller that seems to be common positive. I want to measure the PV and battery voltage using the WC8 analog ins. The WC8 runs off the battery side of the charge controller so the battery ground and WC8 ground are common. This works fine for collecting accurate battery voltage. However I also want to monitor the Solar panel voltage on the input side of the charge controller which seems to have different ground reference. Using the second analog in does not read properly because of the ground reference issue. Probably because the controller is switching the negative side between PV and battery to control charge. Any simple suggestions to collect the PV voltage that has a different ground plane?