- Joined Jun 21, 2021
I have two INA219 sensors, 18V/40W solar panel, solar charger controller and 12V lead acid battery. I want to measure the voltage / current on the battery and the same on the solar panel. I use the circuit that is attached in the attachments.
Battery measuring works nice, but solar panel voltage measuring is wrong. It shows same voltage as battery (so 12V), even if solar voltage gives for example only 5V. I think that solar charger controller somehow blocks voltage measuring, or is my circuit bad? Thank you.
Hello, I have some problem too. I found your thread and look at your schematic diagram. I just realized that the INA219 your gnd connected through the arduino wich is i assume get power from your 12V lead acid battery, because of that the measuring will measure the power of lead acid battery. So i change the INA219 GND to V- Solar Cell, and it measuring well the power and current.
Mod:Link to old Thread.
Last edited by a moderator: