There are two ways of doing this:
Using the relays of the Expansion board to simply turn the charger ON or OFF. This is usually based on settings in the Control Logic for Charging.
Using CAN protocol to talk to the charger and control it using the software.
Method 2 is obviously the better option but if you are happy with just ON and OFF then Method 1 is all you really need.
The current list of devices can be found by going to the Hardware settings for the WatchMon.
We are happy to add a specific charger with assistance if we can get our hands on the protocol document of the charger, have access to a charger for testing to make sure it works (if you have a system with charger this can be done remotely on your system if you wish to) and a scheduled time from our R&D staff.