It is recommended to connect directly to the battery whenever possible.  You can also connect to the converter/charger where the battery positive and negative wires connect to the converter/charger

1. Clean all corrosion from the battery terminals before proceeding
2. Crimp ring terminals onto the positive and negative cables to be attached to the battery
3. Check the ring terminal crimp connection by gently pulling on the cable and ring terminal
4. Attach the Negative (Black) ring terminal to the battery bank and tighten according to the battery manufacturers specification
5. Attach the Positive (Red) ring terminal to the battery bank and tighten according to the battery manufacturers specification
6. Check all electrical connections
7. Apply a protective coating to the battery terminals