Why is there such a big difference in voltage graphs at the same time?
asked
SmartShunt difference in charts
One of those is your Starter battery and the other is a seperate system - likely the "House" batteries.
So by design they should be (other than common Negative rail) - completely seperate Battery sets.
See here my MPPT voltages going to my main batteries.
First the voltages seen by the SHUNT
Then the MPPT Solar charger Values these will be very close, but will follow Exactly the same trend (with no load.)
And at the exact same time the Power in my Starter Battery - So it is a completely different Voltage, because it is a different monitored power system.
(The Rises show at the same time as the Solar charge because I have a seperate Solar panel charging the Starter battery directly.) and that is because it is very cold here at the moment, and due to isolation the Van doesn't get moved much, so due to nothing more than a Dashcam the Battery sinks too low after a few days - so I added the Solar panel and use the Shunt and Venus to also shoot off an alarm if it drops too low so I can go and plug in a DC charger.
