Battery charging with Champion 20001 question

I am brand new to this and am learning as I go (with the help of you fine folks :) ). I recently purchased a chanmpion inverter generator to charge my rv battery during the day. I plugged it in and the overload light comes on. Then I read and it was max 13.3 amps. My charger/converter is a 30amp one.
Anyone help me out here. I'm not sure where to go....
Thnx in advnace...