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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.
A hundred kilowatt-hours go in. Eighty-five come out. Those fifteen did not disappear. This is the full route one kilowatt-hour takes from your roof to your kettle, with the arithmetic included: why a solar panel cannot produce anything but DC, why a plug-in battery sits at 48 volts while a fixed installation does not, and the four places where that fifteen percent leaves as heat.
