Use 12v devices from a 24v power source eg hgvs or 24v batteries on electric vehicles like golf buggies voltcrafts spa 12 dcdc converter acts as a voltage reducer converting 24 volt power to 12 volts and can be used to power devices up to 90wmeasuring 120 x 50 x 200mm the spa 12 doesnt consume a large amount of space and is designed to be permanently mounted in position