Originally Posted by Jerry Woodward
I have a smart bmv712. Just to be clear, When I get my new victron solar controllers, I can connect the BMV to them and it will relay tail current? Can't the solar mppt sense tail current current anyway?
To sense tail current you have to be able to differentiate what’s going into the battery as opposed to coming out of it.
So no a mppt device can only sense charge current and only charge current that it’s producing.
Yes if you add a BMV712, it will relay total battery current. So the Victron mppt can therefore assume that the difference between its current output and the BMV712 is in effect tail current ( that can be confused where’s there is multiple chargers but Victron Ve.smart network handles that too )
I use this approach on my mppt , Victron mains charger
and bmv 712 to correctly deduce tail current and also to synchronise the chargers.