Combine what was never intended to be combined. In PerfectPower voltage converters the input voltage is electrically isolated from the output voltage to compensate for under- and over-voltage on the input side.
DCDC 20 also has an electronically regulated output voltage, to which they owe their extra function as a high-quality IU charger. Moreover, several converters can be used in parallel adn the PerfectPower DCDC 20 is ideal for sensitive appliances or use in safety-conscious areas.