Bigfoot9.6
New Member
Hi all, new here but watch all Will's videos.
I recently purchased a new Aims 200ah battery.
It has a BT BMS so I can monitor the cell voltages and some other status readings.
If I am charging the battery to 100% with 14.4 vdc or 13.6 and the battery gets to about 98% one cell will continue to
charge and when it gets to the BMS Voltage cutoff of 3.8 the BMS shuts of the charge. When the voltage drops to
the Over Charge Release voltage of 3.6 the current jumps up, and the voltage of that cell quickly rises to the cutoff
voltage. This cycle continues until I turn off the charger/converter or lower the voltage to 13.2.
The other cells remain at 3.438-3.454, or they're about. The current when it does this if at 14.4 charge will be around 26 amps.
This cell also has a sizable difference in the voltage as it is discharged past about 20%soc, other cells at 3.1xx and this cell at 2.8.
It will cause the BMS to shut down at about 10% SOC.
When the battery BMS shows 100% and I turn off the charger/converter the BMS will balance this and the other cells quite nicely.
I am measuring SOC etc with the Victron smart shunt and watching the Aims BT cell voltage.
Aims support says as long as the BMS battery capacity is showing 200ah it is ok.
I am going to have another discussion next week with them.
Would like to read what you folks say.
I have two buds that are running multiple Aims 200ah batteries and they see nothing like this.
Jim.
I recently purchased a new Aims 200ah battery.
It has a BT BMS so I can monitor the cell voltages and some other status readings.
If I am charging the battery to 100% with 14.4 vdc or 13.6 and the battery gets to about 98% one cell will continue to
charge and when it gets to the BMS Voltage cutoff of 3.8 the BMS shuts of the charge. When the voltage drops to
the Over Charge Release voltage of 3.6 the current jumps up, and the voltage of that cell quickly rises to the cutoff
voltage. This cycle continues until I turn off the charger/converter or lower the voltage to 13.2.
The other cells remain at 3.438-3.454, or they're about. The current when it does this if at 14.4 charge will be around 26 amps.
This cell also has a sizable difference in the voltage as it is discharged past about 20%soc, other cells at 3.1xx and this cell at 2.8.
It will cause the BMS to shut down at about 10% SOC.
When the battery BMS shows 100% and I turn off the charger/converter the BMS will balance this and the other cells quite nicely.
I am measuring SOC etc with the Victron smart shunt and watching the Aims BT cell voltage.
Aims support says as long as the BMS battery capacity is showing 200ah it is ok.
I am going to have another discussion next week with them.
Would like to read what you folks say.
I have two buds that are running multiple Aims 200ah batteries and they see nothing like this.
Jim.
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