The DDSU666 meter is used in conjunction with the SolaX single-phase inverter for energy management. It is designed for a 100-A system and measures the current drawn from the grid and fed back into the grid, as well as total power and energy. The DTSU666 meter is intended for indoor installation. It can be mounted on a wall or at another location within an indoor space. It can display voltage, current, active power, active energy, 645 communication protocol, used 645 address, and baud rate.