Daly Daly 250A 4s smart BMS with firmware 20210520-3031A, connected to 292Ah LiFePo4 prismatic cells.
With a multimeter, all cells are 3.339V +- .002V
According to the BMS, cell 2 is 3.208V and cell 3 is 3.454V, so something already not quite right there.
Most concerning though is when I connect a charger (Victron blue smart 12V/15A, set to LiFePo4 config)
Cell 2/3 voltages then fluctuate from 4.99V to .25V in each screen refresh in the android app. This is course triggers every failsafe and prevents charging. There are some fluctuations where the cell voltages are around 3.2V to 3.4V, so the battery briefly charges, before one or more cells goes high/low and it stops again.
Unplugging the charger makes everything settle down again.
Seems like it is just cells 2 and 3 which fluctuate up and down.
App screenshots attached. Any help greatly appreciated. Fluctation only occurs while charging - discharging is fine.
see
idle.jpg - voltages with no load
charging.jpg - fluctuating voltage while charging
charging2.jpg - fluctuating voltage while charging
discharging.jpg - voltages while discharging
With a multimeter, all cells are 3.339V +- .002V
According to the BMS, cell 2 is 3.208V and cell 3 is 3.454V, so something already not quite right there.
Most concerning though is when I connect a charger (Victron blue smart 12V/15A, set to LiFePo4 config)
Cell 2/3 voltages then fluctuate from 4.99V to .25V in each screen refresh in the android app. This is course triggers every failsafe and prevents charging. There are some fluctuations where the cell voltages are around 3.2V to 3.4V, so the battery briefly charges, before one or more cells goes high/low and it stops again.
Unplugging the charger makes everything settle down again.
Seems like it is just cells 2 and 3 which fluctuate up and down.
App screenshots attached. Any help greatly appreciated. Fluctation only occurs while charging - discharging is fine.
see
idle.jpg - voltages with no load
charging.jpg - fluctuating voltage while charging
charging2.jpg - fluctuating voltage while charging
discharging.jpg - voltages while discharging