With the “Growatt PV xx Downloader” app you can download the yield data of your PV or solar system from the server in most cases.
If you use the Growatt "ShinePhone" app, you should also have access to your data.
Please test this with the "Growatt PV Std Downloader Solar" test version before installing the full version.

In the "Growatt PV Pro Downloader Solar" version, your data are saved in severall csv files.

For convenient handling:
The file names are suggested by the app. You can specify a personal prefix for the names under Settings.
And you can download all days of a month in one go. You just have to check the "all days" checkbox.

Have fun with this app!