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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.
Almost every home battery lets you watch. A much smaller number lets you change anything. This is the full dossier behind the video: the endpoint or register per brand, the firmware version it applies to, the verification date, and the arithmetic that shows why an 800-watt setpoint rarely pulls 800 watts out of your battery.
Salespeople say a plug-in battery can't trade. That's true for one of the three meanings of that word, and not for the other two. Here's which brands you can control locally, why your energy supplier is the real bottleneck, and why a cheap hour can still cost you money — with the 590-day backtest that backs it up.
