I currently use the aux input on my BMV-712 and the Cerbo GX/VRM to monitor the start battery voltage in my boat. Being an aluminium boat I am making a few changes to the system to ensure that electrical systems are isolated from the hulls and that the start battery system is fully isolated from the house battery system. This means that the aux input on the shunt won't be able to read the start battery voltage any more, as they won't have a common ground.
What other ways can I get the start battery voltage into the cerbo GX and VRM for monitoring purposes?
A little more detail on the system if it helps:
- 2 x 25.6V 200AH Smart Lithium
- Multiplus 5k
- 4 x MPPT 100/20
- Cerbo GX
- Orion 24/12-70 for running 12V house loads
- Swapping the Orion 12/24-20 for a Orion TR Smart Isolated 12/24-15 for charging the house from the start batteries
If only the Orion TR Smart could do communications over BT or VEDirect this would be easy.