A normal car has an alternator to provide 12V power to lights and all the other loads, and to keep the 12V battery charged. This electric car has a DC-DC converter instead. It gets high voltage (~280V) power from the main battery and converts it down to 12V. The first unit wasn't working the way I wanted, so I returned it and Belktronix modified it and sent it back. This is one of the advantages of choosing Made in the USA whenever you can. Here it is installed.