You'll be able to reconnect your system by updating your Wi-Fi details in the relevent app's settings. If your inverter is a Duracell Energy product, log into the Dura-i app and connect your new Wi-Fi.
You can also follow this step by step video -
If you have a Solis Inverter, you will need to log into the Solis cloud app and update the Wi-Fi details. If you need support with this, your installer or our support team will be able to help.