I have a 12v Multiplus/Cerbo/SmartSolar/Orion setup in my RV. Everything works fine except when driving.
I have a Thetford 3 way fridge which is supposed to use the alternator when driving (connected to the D+ signal).
What is happening is that the leisure battery (lithium) discharges when driving to power the fridge!
Looking in VRM I can see a draw of 20A when the fridge is on 12v. If I turn the fridge off, this stops.
The Orion has D+ connected to H, so only kicks in when the engine is running, and has Engine shutdown detection turned off. (I tried it turned on and it makes no difference).
The input voltage lockouts are set to 12.2 and 12.5. What happens (if I watch the Orion in VictronConnect), is that the input on the vehicle battery starts at around 12.8v. When I start the engine, it starts outputting at around 14v into the leisure battery. BUT this causes a drop in voltage on the vehicle battery to around 11.8v, so the Orion stops. Because it stops, the vehicle battery then goes back up to over 12.5v so starts again. It is stuck in this cycle.
If I turn the fridge off, I still get this constant cycling.
I am presuming there is a link to the fridge problem and the Orion, but who knows!
Any help very much appreciated.