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Error 170305110, Head unit undervoltage, level-3 fault, means the battery of the AEG SolarCube Pro is discharged too deeply and the battery management system has locked it. For days the app then says Battery Force Charging Mode while 2 to 6 W goes in. Our unit drained itself off the grid, sat locked for 4 days and 5 hours after it was plugged back in, and came out on its own. What each message means, why it drains while it looks switched off, and what does and does not help.
The AEG SolarCube Pro (AS-BBL08) has an RS485 port that speaks Modbus, locally and without an account, but we found no register document that matches this unit. This is the register map we built ourselves and checked register by register against the unit: how to connect, which registers work, how to control charge and discharge, which registers store a value and do nothing, and which block you never write. The whole map is also available as a CSV download.