First, add your new device with the "New Device" button in the Home tab.

Once you've added your new inverter, open your plan's page from the Connections tab, and tap 'Use another Device'.

Choose 'Select an existing device', and select your new inverter. Your plan and settings will be moved to the new inverter you select.

Please remember to enable MODBUS on your new inverter before attempting the steps above. 

Modbus is enabled on all Sungrow inverters by default.