This panel is for remote query and control of Phoenix inverters equipped with UTP socket. It can also be used with MultiPlus inverter/charger if automatic power transfer is required, without battery charging function. The brightness of the LEDs is automatically reduced in darkness. It can only be used for the following types: 12/12, 12/16, 12/2, 12/3, 12/5, 24/12, 24/16, 24/2, 24/3, 24/5, 48/3 and 48/5.