Shale MacGregor
Solar Enthusiast
- Joined
- Sep 5, 2021
- Messages
- 641
I need to capacity test so I can match ~ 400 cells, is there a faster way to do this than limiting it to .2C ? I tried testing at .5C thinking I would adjust "expected" capacity and it would enable me to match cells, unfortunately this caused voltage sag below the 2.5V mark waaay too soon. These cells are rated at 2C and are 60AH.
I use a Siglent Load Tester that can do up to 200 Watts, and I have a shunt that works great using a load with an inverter for real world testing, but that only works for 4s.
I was considering hooking up a large enough array to max out my 1000 watt inverter at .2C ( 7p4S), and when one cell hits the minimum I could stop, give all of the batteries the minimum score (divided by 7) and then by testing voltages break them into more groups, or else just test each one from that point forward.
Is this a good idea, or does someone have a better one that would be advisable. Id rather not buy a bunch of shunts / load testers just to save time but at this rate it will take me a few months.
Thanks!
I use a Siglent Load Tester that can do up to 200 Watts, and I have a shunt that works great using a load with an inverter for real world testing, but that only works for 4s.
I was considering hooking up a large enough array to max out my 1000 watt inverter at .2C ( 7p4S), and when one cell hits the minimum I could stop, give all of the batteries the minimum score (divided by 7) and then by testing voltages break them into more groups, or else just test each one from that point forward.
Is this a good idea, or does someone have a better one that would be advisable. Id rather not buy a bunch of shunts / load testers just to save time but at this rate it will take me a few months.
Thanks!