Had this exact same grief on my boat build. Turned out my phone's battery saver mode was killing the BT connection in the background — Android is brutal for it.
HappyBuilder | 563 posts
Had this exact nightmare on my boat last January. Cells were reading fine on the BMS display but discharge kept cutting at around 5°C ambient.
Turned out my temperature...
@TelHall have you looked at pairing your Cerbo with a Shelly EM clamp on the grid feed? Chuck the data into Home Assistant and you can pull Victron's MQTT feed alongside real-time grid...
@LH_Marine that's the nightmare scenario right there — controller taking out other kit with it. Saw similar on my boat build, mate had a cheap unit kill a brand new battery.
Ended up going Victron...
@MarineGaz that BMS point is a good shout — caught me out on my boat install too, different context but same principle of hidden management layers messing with shunt readings.
One thing worth...
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