Good afternoon knowledgeable folks! ^_^
I'm looking at spending my spare time building an electric bike for fun :D
However, general electronics design is most definitely not my forte, and I was wondering if anyone would happen to have a few pointers if I continue down this path.
What I'd like to do: create a battery pack utilizing 420x 18650 cells (20s21p, 3780kWh) to power a 4kW (peak 8kW) motor.
I would like to control the motor with an Arduino (I'm most familiar with the Arduino Due, so I would probably stick with that).
My greatest concern is the monitoring of the cells, and how I balance charge them and protect them during use. If I were to utilize a charger like this 20s 72v charger, my understanding is that this would only monitor a 20s1p battery accurately; I'm trying to figure out how I work in all the parallel cells.
My second biggest concern is how I use the Arduino to control the output voltage to the motor (hardware-wise, not programming-wise).
This project is intended to be an electronics hardware and batteries learning curve for me, and coincidentally I have a bazillion 18650 cells kicking around xD
tl:dr; looking for tips on a balanced BMS (72v) and voltage output control via Arduino
Edit: The goal is to also charge the batteries via a standard 100-120vAC houseplug.
Edit2: On an aside, if this involves me learning how to build 21x small 72v 6A 20S bms's and having them work together, that would be excellent as well. Ha.