You can request the installer code through Growatt
The Growatt installer code is a unique code assigned to each installer registered with Growatt. If you are an installer registered with Growatt, you received your installer code when you registered.
You can register as an installer with Growatt here
If you are not an installer but would like to have a Growatt product installed, you should contact a registered Growatt installer in your area to obtain their installer code. You can find a list of registered installers on the Growatt website or by contacting Growatt customer service.
Please note that the installer code is usually required for certain advanced operations and settings on Growatt products, and should only be used by registered installers trained in the correct installation and maintenance of Growatt products.