The String Monitoring Unit enables to monitor utilisation of power, while providing exceptional system safety. The SMU combines the multiple DC input coming from the panel terminations and converts them into one DC output. The output of the SMU is connected to the inverter. Replaceable fuses are used for each string input in the SMU. The SMU is available in 8, 16 & 24 string inputs and can monitor parameters such as current, voltage etc., The String Monitoring Unit is also designed to communicate via Modbus RTU to the PLC/SCADA.