MatekH743 battery monitor

Hi I am running a Matek 743h slim v4 fc and I am trying to run a can Matek battery monitor but I cannot seem to get it to display properly.

It is a survey vessel running ardurover firmware.

I have a 100ah lithium battery powering it all and need to keep on top of it.

I have supplied the fc with a 12v Matek Bec so it’s always getting 12v (11.3-11.95) on the HUD.

I am trying to connect a Matek can battery monitor but to no avail. I have set my P1 to 1 and my monitor to drone can but cannot see anything.

When I enter the correct battery voltage it will not take it as a parameter and I will get a bad battery display on mission planner.

Has anyone else had anything similar and/or knows of how to get through it.

Thanks

We used that board combination in our very well documented build.

Take a look at it, we have connection diagrams and parameter lists