Shinetools initial password: ossyyyymmdd (current date)
Shinephone/growatt key: growattyyyymmdd (current date)
Initial passwords 12345678 / 1234

Dashboard:
https://server.growatt.com/login

Warranty details:
https://www.ginverter.com/support/warranty

https://pypi.org/project/growattServer/

https://github.com/johanmeijer/grott
https://forums.whirlpool.net.au/archive/9xv65qw6

https://www.reddit.com/r/SolarDIY/comments/xkizq5/growatt_inverter_and_battery_charging_time_config/
https://electricianforum.co.uk/threads/growatt-ct-discrepancy.56213/page-2

Note: the inverter is doing a self test routine when the panels start supplying and when they cease eg sunrise and sunset. It goes into mode of drawing from the grid instead of the battery whilst this is going on, typically between 5 and 7 minutes.