Yeah had this on my narrowboat last winter. Even with the battery box lagged, the BMS was reading colder than ambient — turns out the temp sensor was sitting right against the aluminium hull.
Got this exact issue on the narrowboat. Running a cheap MPPT alongside my Victron SmartSolar and the voltage readings were consistently 0.3–0.4V apart under load.
Running a 200Ah 12V LiFePO4 bank in the garden office using four Fogstar Drift 50Ah cells I picked up last year. Paired with a Victron SmartSolar 100/30 and a Multiplus 12/1200.
Yeah, the thermal side's massive. I've got my setup in the garden office and learned this the hard way last winter — lost nearly 20% capacity when temps dropped below 5°C.
Worth noting though: if...
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