Yes, I'm leaning towards a little more gear, and I've found a small CC-CV device for ~$30 delivered.
It would make it easier to rank and group my two dozen cells. Not that easy is mainly what I'm after.
I'd thought I would need to spend several times that, and store another...
I agree about top balancing being better, generally. The recommended method with a regulated power supply is simpler and clearer, but more expensive and space-taking, so I'm choosing to top balance cells in 4s groups.
I can't just take a cell out, done. If I substitute a cell or two...
No, I certainly wouldn't charge that high every cycle - only to establish the pack. The reason I get them to hit 3.65/3.6V and very low current , is to coax them to a ceiling so I know they're full and even.
I set a pretty conservative charge limit of 3.55V/cell or lower for...
Here's what I have:
- 24 LiFePO4 nominal 80AH used cells to play with and learn from.
- a 12V 22A charger with adjustable constant voltage
- an inverter & loads, variable from 0A to 18A at the battery
- a JBD 4s BMS with Bluetooth and xiao xiang Android app (Overkill-similar)
- 4 50W 6 ohm...