modbus

5 articles

AEG SolarCube Pro error 170305110: what “Head unit undervoltage, level-3 fault” means

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.

energieOctober 1, 202617 min read

AEG SolarCube Pro review (AS-BBL08-6K): what comes out, and where the rest goes
The AEG SolarCube Pro costs € 1,799 and promises 6.0 kWh usable and a single efficiency figure. We hooked it up to our techbench for two days, walked the whole discharge curve by hand and closed the cycle: 1,165 Wh went in and 947 Wh came out. After the test, off the grid, it drained itself until the battery management system locked it out, and it only came out of that by itself 4 days and 5 hours later. Here is the full file behind the video: every figure with its origin and grid setting, the registers we mapped ourselves, the places where the product sheets contradict each other, and the fifteen things I do not know yet.
energieOctober 1, 202660 min readReview
Research
AEG SolarCube Pro Modbus registers (AS-BBL08 / HYXi HALO): what works and what only stores
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.
energieOctober 1, 202623 min readResearch
Controlling a home battery: what each brand lets you read, and what it lets you write
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.
energieAugust 24, 202623 min readResearch
Trading with a plug-in battery: it works, just not where your salesperson thinks
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.
energieAugust 7, 202618 min readResearch

modbus

AEG SolarCube Pro error 170305110: what “Head unit undervoltage, level-3 fault” means

AEG SolarCube Pro review (AS-BBL08-6K): what comes out, and where the rest goes

AEG SolarCube Pro Modbus registers (AS-BBL08 / HYXi HALO): what works and what only stores

Controlling a home battery: what each brand lets you read, and what it lets you write

Trading with a plug-in battery: it works, just not where your salesperson thinks