CBE DS300 split charge question.

[Okta]

How about setting the PV MPPT to lead acid profile and let the B2B charge the lithium leisure battery to the correct profile.

My set up does not include solar and MPPT. I have set the CBE mains charger to lead acid which slightly undercharges the battery but keeps it between 92% and 95%, which is fine when on an electric hook up. The B2B makes sure the battery starts off full when I am off grid when I need it to be.

 

[Frehak]

I had the same problem using a CTek 250SE DC - DC charger, it is explained in the manual of CBE PC 180 , you must cut resistor R37 on the DS300 board to disable the paralel charger relay, thats all , so simple

View attachment 89558

I have cut R37 but the batteries are still connected when the car is running, Is R37 a resistor or just a lask, can't measure any resistance value on it. Some other suggestions for getting the living room and car battery separated

 

[Okta]

I have cut R37 but the batteries are still connected when the car is running, Is R37 a resistor or just a lask, can't measure any resistance value on it. Some other suggestions for getting the living room and car battery separated

I left the zero value resistor in place and put a normally closed relay on the engine battery connection to the DS300. The relay was opened by the D+ signal when the engine was running which separated the batteries but left them connected for normal operation when the engine was not running.