This simple inverter kit is designed to power these 14V lamps from a 12V lighting transformer or 12V battery. Operating range from 8V - 15V, 3mA @ 12V quiescent, 340mA with 5 lamps. Delivers a constant voltage to the lamps. The kit includes PCB, all onboard components inc, pre-wound inductors. This package is designed to be used with the SPPK solar system.