Thank you, Henry, for taking the time to look into my issue and for your suggestions.
I appreciate your help. Based on my Shelly measurements, the PV channel shows about +2.8 kW and the grid channel about -1.8 kW during solar production, which seems logically correct to me.
However, despite the detected PV surplus and a battery SOC of only 15%, the Hyper 2000 still does not start charging.
I will continue investigating and report back with the results.
Thanks again for your support!