Both are isolated over positive on a three way switch.
In the illustrated case, the front is isolated from the house, however my mppt still senses the incorrect voltage. This is problematic because my house batteries, while not dumb, use simple voltage to regulate the controller.
When the Mppt reads incorrect voltage, it will float for infinity, overcharging the house cells.
How could I fix this?
Has anything been smart networked?
Yes, everything is connected to the cerbo , the batteries though have no logic connected anywhere. Both are super-b. The house cells are 150ah epsilon. They ( victron/super-b) can’t share logic.
So the Mppt checks voltage on the battery leads and can’t sense the shunts. That was my reason to include the cerbo, even if it’s functions are only useful for switching my old victron inverter on and off remotely and logging shore power pull.
Oh, smart networked, no nothing.
Edit: after configurating smart networking, I see the Mppt defaults to the front battery. How should I change this?
I disabled shared voltage sense, perhaps that may be the issue.
Note that it’s not advisable to have communication connections to the Cerbo and smart networking at the same time.
This. Don’t mix the two systems
Second issue is what is set to the battery monitor on the cerbo? That is the controlling battery.
