Dometic SMP301-07 is a switching power supply that integrates many useful functions in a compact and lightweight device. Its main job is to turn 230 V into 12 V to supply lights and other comfort gadgets. When mains power is unavailable, it automatically supplies energy from the batteries. The switching power supply ensures batteries are always well charged and its integrated battery charger is suitable for all types of lead batteries between 50 and 300 Ah. LED indicators keep you informed about the current charge status.