Quote:
Originally Posted by NCPW
Nice work! 
Where were your cells sourced from and how do you like the Chargery BMS and charger so far? |
Cells are from Greentechhybridbatteries on Ebay. They are from a Kia Soul EV.
Bms is OK, it is helpful to see the cell voltages and the alarms and relay control are nice, but i wish it had more customization on how the relays were able to be controlled and whatnot. I can do everything i want with it, but a little more would be nice.
As for features and its balance current capabilities, its amazing! I see SO many batteries with dinky little 50mA balance current ratings and they just cannot bleed enough power fast enough if your charging at, say, 20a and a cell is high to keep it safe. I'll take my 1200mA any day over 50mA, but again alot of people dont think about it. With this setup, i see no more than 25mV under load difference in my cells, and the active monitoring is great. It even stores the cell voltages if an alarm were to go off so you can look back and see what everything was at when it happened. Particularly nice for charging over-night to ensure nothing happened while you were sleeping.
I have the pack set to 4.2v/cell though these cells are rated up to 4.3v due to their chemistry, and my min voltage cutoff in my controller is set to 3.0v. So im well within their full charge potential.
Each module is 14s2p, max voltage for these packs, however is 60.2v, not the typical 58.8 like most 14s packs.
For charging I have a 20a, 60v PSU running a buck converter thats capable of 15a. The buck is CC/CV and I set it to my charge voltage (58.8v) and limit current to 10a to keep heat down. Charger is enclosed in a metal box with server fans to keep everything cool. Done this in the past with a custom go-kart battery and the charger works great.