I have got an assignment to build a solar powered go kart. The items which I have are two 40 watt solar panels that are 15 volts each and carry current of 5 ampere each. I am planning to use two 12 volt batteries to run the motor and I want to charge the batteries using the solar panels. I don’t have any idea about the charger I need. Could you guys help me with places where I can find a charger that is DC in and out? Any information related to my query is deeply appreciated. Thanks.