There is more than way to connect to solar
1 Direct from controller to batteries using at least 6mm cable for low voltage losses.
2 Controller hab battery to -B2 +B2 Controller van battery to +B1 (as cbe300 ) depends on quality of van wiring effectively same as 1.
3 is there anything in the manual that indicates that the display gives any useful info on a solar connection , that implies connection 38 OUT could/should be connected to hab lesuire battery and -B2 32. Van +B1
Sorry i couldn't find any helpful info on your module.
Mine is a cbe300 with solar connected as 1 (initially as dealer fitted, micky mouse wiring) rewired with 6mm cable and Votronics controller.