Bought a BMV-712 as an enhancement for my Smart 100/50. My intention is to get a better view on the SoC and remaining capacity of my solar batteries of my cabin. As the 100/50 is very far away in a remote location I prefer to test things prior to go there. So here is what I did.
I took an older 12V / 42A wet battery and connected the BMV-712 and shunt. Configured the 42Ah in the app. Then I charged the battery for 24 hours to be 100% sure it is @100% SoC, charger displayed "float". Then I set the Soc=100% in the app.
Next I connected two 12V/21W bulbs to discharge the battery.
I expected to see correct values for decreasing SoC and remaining battery time after a while.
However the values I see after a few minutes are:
9.87V @ 3A (battery seems to be pretty done), but instead of seeing a low SoC, the SoC still is at 94.6% ! I would expect almost zero when the battery is at 9.87V.
Am I wrong with my setup and expectations? Do I need to repeat some steps to allow the BMV to learn?