I posted recently about my struggle with a broken BMS from an Enginer PHEV kit. I initially tried to fix the BMS myself but without success.
During the process, I did manually top balance all my cells one by one using a LiPro balance charger Imax B6.
That was before I decided to go without BMS, and that is unfortunate because now I need to go the opposite way: discharge the whole pack to about 2.7V per cell.... it is now fully charged at 3.5V per cell and we are talking about 90AH cells.
The LiPro small charger is able to discharge a cell, but it will do it at 2AMP. Quick calculation means it would take 45hours per cell, that is too long.
So I am looking for a safe way to discharge my pack, cheap if possible. The challenge is to have something that could be unnatended if possible and that automatically disconnect.
I have some ideasusing some diode. Maybe by placing a couple of power diode in series i can make a device that dischare a single cell and naturally stop discharging at around 2.7V (2.7 divided by .7 per diode, that seems legit but maybe too good to be true).
Annyway there are many experienced EV builder out there who bottom ballance regularily, so I am looking for your advice.
Thanks in advance
During the process, I did manually top balance all my cells one by one using a LiPro balance charger Imax B6.
That was before I decided to go without BMS, and that is unfortunate because now I need to go the opposite way: discharge the whole pack to about 2.7V per cell.... it is now fully charged at 3.5V per cell and we are talking about 90AH cells.
The LiPro small charger is able to discharge a cell, but it will do it at 2AMP. Quick calculation means it would take 45hours per cell, that is too long.
So I am looking for a safe way to discharge my pack, cheap if possible. The challenge is to have something that could be unnatended if possible and that automatically disconnect.
I have some ideasusing some diode. Maybe by placing a couple of power diode in series i can make a device that dischare a single cell and naturally stop discharging at around 2.7V (2.7 divided by .7 per diode, that seems legit but maybe too good to be true).
Annyway there are many experienced EV builder out there who bottom ballance regularily, so I am looking for your advice.
Thanks in advance