Stepping Down 24V to 12V the Right Way When upgrading your RV to a 24-volt lithium battery system , one of the most common questions we get at Big Beard Battery  is: “If I switch to 24 volts, how do I still power my 12V lights, fans, and accessories?” It’s a great question—and one that comes up often as more RV owners make the jump to higher-voltage systems for efficiency, faster charging, and cleaner power management. The good news is: you can have both. With the right DC-DC