Hey guys looking for some feedback with regards to a problem we have been facing.
We use a 48v lithium battery pack (fully charged voltage 58.4v) in our vehicles and we have designed them with regen braking. The challenge we have is that when the vehicle is fully charged and we have customers who live at the top of a hill, when they set out down the hill the regen braking kicks in and charges the battery pack, however it doesn’t take long for the battery to reach max capacity and for our system to shut down.
As a temporary measure we have limited the charger so that it doesn’t fully charge the battery allowing room for the regen braking, but the long term effect on the lithium is not ideal.
So it is our thought to use a 1000w or 2000w 10R chassis mount resistor, with a timer delay relay. The customer would depress the timer button and set off down the hill, it is our thought that the resistor would offset enough amps to not have the lithium cells spike and have the BMS turn off the battery pack.
This would only need to be used once a day on the first run down the hill because after that the vehicle uses more power then the regen can generate and it is no longer an issue.
We would be interested in some feedback, thinking of using TE1000B10RJ or TE2000B10RJ
Thanks in advance