Example DC-DC converters include a housing having at least two bullet terminals. The at least two bullet terminals are configured to mate with corresponding terminals in a DC bullet breaker panel. The converter also includes a DC-DC voltage converter circuit coupled between the at least two bullet terminals, and a controller coupled with the DC-DC voltage converter circuit. The controller is configured to control the DC-DC converter circuit to convert a DC input voltage at a first one of the at least two bullet terminals to a different DC output voltage at another one of the at least two bullet terminals. Methods of converting DC voltages using DC-DC converters having bullet terminals are also disclosed.