So i've been looking into how to charge my 20s pack for my ebike...
Heres the predicament:
-Cheap BMSs are scary, quality boards cost $$$$
-I couldn't find a simple monitor/equalizer that would bleed off high cells as well as notify me when any cell reached 3.2v (they all trip at ~2.5v for what ive found). This would be used with a low current 84v pack charger.
-Balance chargers above 10s don't really exist.
-Disassembling the battery pack to parallel charge every time would suck.
Eventually id like to build the monitor and equalizer board based off of the bestechpower equalizer boards + DW01 undervoltage protection chips.
But I've found a creative and cheap way to balance charge a 20s pack at 20A for $30. I just need 20x TP4056 1s 1A lithium charger boards. Normally this wouldn't work when the pack is still in series due to ground loops ( ), but by using 20x 5v1A AC power supplies, each charger is isolated.
Also, charging will be done through the balance plugs which are 24AWG (1.5A max) for me and will limit the charge current. I thought I could go up to 3A with two parallel cells, but most balance wires carry the current of two cells. So 1.5A is the limit for my case.
I've sourced the parts from aliexpress. If I had a thrift store nearby to source 20x usb wall chargers, i would have bought the TP4056 boards from the US and had it done in a week
Heres the predicament:
-Cheap BMSs are scary, quality boards cost $$$$
-I couldn't find a simple monitor/equalizer that would bleed off high cells as well as notify me when any cell reached 3.2v (they all trip at ~2.5v for what ive found). This would be used with a low current 84v pack charger.
-Balance chargers above 10s don't really exist.
-Disassembling the battery pack to parallel charge every time would suck.
Eventually id like to build the monitor and equalizer board based off of the bestechpower equalizer boards + DW01 undervoltage protection chips.
But I've found a creative and cheap way to balance charge a 20s pack at 20A for $30. I just need 20x TP4056 1s 1A lithium charger boards. Normally this wouldn't work when the pack is still in series due to ground loops ( ), but by using 20x 5v1A AC power supplies, each charger is isolated.
Also, charging will be done through the balance plugs which are 24AWG (1.5A max) for me and will limit the charge current. I thought I could go up to 3A with two parallel cells, but most balance wires carry the current of two cells. So 1.5A is the limit for my case.
I've sourced the parts from aliexpress. If I had a thrift store nearby to source 20x usb wall chargers, i would have bought the TP4056 boards from the US and had it done in a week