with the NOCO hooked up like that the battery monitor can't count the electrons flowing in or out of your batteries... the negative of the charger has to go on the shunt like everything else.
I guess I'm not understanding why this would be... I'm no electrical engineer but if the battery is a simple tank and it's getting filled by solar and\or alternator with their connections, and is also getting filled by the noco with a direct battery connection, why would it matter what the power source is if the tank\battery has it's own connection to the monitor\shunt to measure the fullness of the tank?
Edit: I guess I did forget to mention I am only concerned with what the voltage is and calculated state of battery charge percentage is on the monitor at any given time, not necessarily the measurement of variable flow of current or anything else the charger is providing when hooked up like is happening with the solar and alternator connected via the shunt and +\- buses. I am happy trusting the little green light on the charger and the battery voltage reading on the monitor to feel confident enough things are working. Plus it's a major PIA to get to the shunt in this camper :-).
Edited by Maddogs, 23 November 2023 - 07:55 PM.