I have this diagram if it helps?
View attachment 205499
I used one of these 12 volt PSU s from ebay Snappy PSU-SNP6-12VF Power Supply 12VDC 0.5A 6W CV In-line CST
It is powered up as soon as the mains is turned on and gives the signal to plug 18 pin 2 on the DS-300. This allows the various CBE controllers to know that the mains is turned on. This enables van and leisure battery charging and lights the mains network indicator on the display. It also swaps over the fridge supply if appropriate If you have a CBE battery charger then this signal is supplied from the battery charger (assuming that it is powered up as soon as the mains comes on). There is no equivalent signal on the Victron charger.
This is what it all looks like in the van
View attachment 205511
Hope that is enough info for you. If not let me know which bits you want more details on
Cheers
Wil.
