Hi. I run two 12 volt battery’s in parallel. With my Victron smart shunt. In my travel trailer running a few led lights and a furnace that’s it
After a half day my volts read 11.85 and my percentage reads 90%
Online. It says a 11.85 volts would almost have no battery life left.
So is the volt reading incorrect? Or my % reading incorrect?
Wrong installation of the shunt? (very common problem)
Wrong settings of the shunt?
I have a similar setup on my travel trailer. Compared to the LED lights the furnace will draw significantly most power than the lights. If you are taking a voltage reading when the furnace is running, or a short time after it stops, yes it will show a lower voltage compared to it's normal fully charged resting voltage or normal SoC (State of Charge). Similarly the batteries will show a higher than normal resting voltage if taken during or after charging. Either one of those scenarios are normal and nothing to be concerned about.
To get a proper volt reading fully charge the batteries while disconnected from the trailer with nothing else connected to them like the shunt and let them rest for a few hours or better yet over night. Then using a good voltage meter take a reading. Whatever that reading is will be your base line for comparison with the shunt. Re-connect the shunt. A few millivolt difference between the shunt and your volt meter is nothing to be concerned about.
As mentioned above read the shunt manual carefully.
