This panel is intended for Phoenix inverters equipped with a UTP remote monitoring and control socket. It can also be used on a MultiPlus inverter/charger when an automatic transfer switch but no charger function is desired. The brightness of the LEDs is automatically reduced during night time. Only for models: 12/1200, 12/1600, 12/3000, 12/5000, 24/1200, 24/1600, 24/3000, 24/5000, 48/3000 and 48/5000. UTP patch lead required.