Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
This will require some carefulness about details, and some communication back and forth.
First of all: I presume your Xantrex 3624 is really a Schneider Electric Xantrex TR series inverter/charger, model TR3624. If this is not the case, let me know.
Secondly: it must be matched perfectly to the batteries, if it is hooked up to batteries. What battery or batteries is it to be hooked up to (assuming it is actually right for them, as a charger) ?