I have this happen to me quite often - they seem to have some sort of rate limiting in place. It most often happens when I have to reload Home Assistant for some reason, seems all the calls it makes saturate things. But it is very unpredictable.
You will most likely find you can still log in to the Growatt web page at https://server.growatt.com/login where you can try a couple of things:
- If you change your password, you will most likely find the rate limit is lifted
- If you can't even log in to the web page, try in Incognito mode. If that works, delete the page cookies for the normal page.
- I have created some visitor accounts and use one of those for the app so I can rotate between accounts if one gets locked. Visitor accounts are read-only so you can't manually change settings, but they allow the app to use an account seperate from WW (or HA if you use the Growatt integration, where this hack is especially useful). To create open click "Setting" in the web page, then "Visitor Account list".
Hope one of those things helps!
