I have had success using the grott-server as intermediate. It allows the data from Growatt inverted to be delivered to mqtt, pvoutput and server.growatt.com at the same time.
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Thank you for this project, I now have it working uploading from my father’s MOD 5000TL3-X to pvoutput as well as relaying back to Growatt.
This is by far the best solutions of the various ones out there for Growatt to pvoutput. At first I tried setting up a static DNS entry to redirect to my server instead of server.growatt.com, however this didn’t work at all - so reconfiguring the Wifi device is required (as per the instructions).