hillzofvalp
100 kW
So I'm geting a bunch of A123 cells all having similar cycle life but very low use (<10 cycles). I have two hyperion 1420i. What is the easiest method to match all the cells into groups so I can create 28 11p modules with similar capacities?
I figure I can charge all the cells together, then discharge them in pairs with each hyperion... taking 15 minutes plus setup for each pair. At that rate, though, we're talking upwards of 42 hours.
Maybe it would be worth making some sort of arduino kit that would record capacity of 8 cells being discharged at once. How hard would it be to calibrate, though? Could I do this with pwm to achieve the same discharge current with 5 or 10% tolerance resistors?
What about charging them all up, then hooking maybe a dozen up simultaneously to an LED which will turn off at say 2.5V. Then I could simply time them near the last 30 critical seconds.
I figure I can charge all the cells together, then discharge them in pairs with each hyperion... taking 15 minutes plus setup for each pair. At that rate, though, we're talking upwards of 42 hours.
Maybe it would be worth making some sort of arduino kit that would record capacity of 8 cells being discharged at once. How hard would it be to calibrate, though? Could I do this with pwm to achieve the same discharge current with 5 or 10% tolerance resistors?
What about charging them all up, then hooking maybe a dozen up simultaneously to an LED which will turn off at say 2.5V. Then I could simply time them near the last 30 critical seconds.