hi,what i understood is that you got a 24v battery bank.i believe that you got 2 12v batteries which are connected i series for 24v,am i right?if it is this way,then you can easily charge the batteries through the generator by connecting the 12volts batteris in parallel.by the way,to charge batteries,you need DC current not AC.if you are charging the batteries the way i am telling you,then it will take double time compared if you were to charge 1 12v battery.hope it helps friend.see ya