With a BlueSolar 100/50 and a Bluetooth Dongle I am not able to see any trends history. On each load of the app the trends are reset and the history is empty.
I previously was using a SmartSolar. With the SmartSolar, on the same phone, with the same version of the app, the history worked fine and I could easily check yesterdays data or the data from a few hours ago.
This feature is essential for me to monitor and I fully expect it to work as described in Victron documentation (and my purchase was based specifically on the extensive information and history available in the Victron Connect app).