DC to DC converters can increase or decrease the voltage from a battery supply. By installing a DC to DC converter you save space and weight by eliminating the need for additional batteries that would otherwise be required. Additionally, DC to DC converters regulate the output voltage delivering safe power to your electronic devices.
There are two frequently used terms for types of DC-DC converters; non-isolated and isolated. The “isolation” refers to the existence of an electrical barrier (galvanic isolation) between the input and output of the DC-DC converter. With a non-isolated DC-DC converter there is a common ground connection between the two voltages.
Galvanic isolation is a design technique that separates electrical circuits to eliminate stray currents. Signals can pass between galvanically isolated circuits, but stray currents, such as differences in ground potential or currents induced by AC power, are blocked.