How to do if my inverter is offline, but it was online before?

If your inverter is online, please do the wifi connection again via solax app refering to this link:https://kb.solaxpower.com/solution/detail/2c9fa4148ceddee5018e93f7adca2682
If still no luck, and you are using wifi dongle, kindly refer to this link to do the wifi manual connection:https://www.eu.solaxcloud.com/wifiSetting/index.html, if still no luck kindly contact solax support with the DHCH and System page picture.
If you are using lan dongle, kindly follow the steps below to do the troubleshooting:
1. Plug the data cable to a laptop rather than an inverter to check if he can browse the internet normally or not.
2. If yes, press Win+R to open CMD, type in "ipconfig/all" and send the results back to us
3. Also he needs to check if the LAN funciton of router has been swithed on or not?