Some of these jokers are deep into Basen. This should be a sticky and there should be a bad vendor's list. Basen and one of these jokers is holding up my build.I warned strongly about Shenzen Basen months ago...
CATL 271Ah 'Grade A' prismatic cells from Shenzhen Basen - Cell terminals without threading
Hey all, This is my first solar/battery project, and I suppose I'll document my experiences here. I ordered 4 280Ah EVE cells from Basen in march. They got back to me about a week later and said that they were actually out of EVE cells but could replace them with CATL 271Ah cells. I accepted...diysolarforum.com
One of the Jokers may be the Global supply chain. Go to any port and see the container ships waiting to unload. That delay is affecting everyone.
I bought my batteries from a guy in Harrisonburg, VA who was selling them out of his trailer. I was the only person who had a bad cell according to him. Same response from Gloria Luo at Basen. I just now asked him where can I buy a replacement cell. The Sound of Silence. The cell I want replaced tested 0.813v and had never been used and was manufactured in April 2021. It has been charging with a bench charger for 48 hours and it is up to 3.3v. Is that normal? I really don't know.
3.3 is the normal resting voltage. Do you know how many Amp hours you put in it? That will tell you the capacity.
All I know is that I started at the beginning of the week at 1.3A to get to 3.29v and now it is charging at 2.6A and the cell is at 3.365v per multi-meter. I don't think it is supposed to take this long to get to 3.55A which is what my bench charger is set to. The whole friggin solar project is on hold; a dime holding up a dollar.
Ordered cells in mid March from Amy. She got them out just as Shenzhen was shutting down. Just arrived this Monday.
I changed the charger leads to 8 AWG and lugs and charged at 10A to 3.57v. I removed the leads and tested today; the cell dropped to 3.31v within a couple of days with no load. Do I really have to spend $300 for a new charger to charge at 40A? Should the local seller reimburse me?
I am not clear why your cell discharged like it did? Are you saying it self discharged? Or was it a runner that went low when the pack was discharged?
I charged it as a single cell and after the cell sat for a couple of days it lost the charge. Definitely not storing power; maybe a good paper weight. I removed the leads after it reached 3.57v; don't know how long it sat at 3.57v, at most a couple of hours. Is that $300 charger with 40A necessary for a 16 cell battery?
No, LFP is not finicky about charging rate like Lead Acid is. Just do not Float them for a long period.
I don't think a lot of power goes into Lithium batteries during the time the current tapers while in Absorb stage. I only charge to 3.45 volts and my cells settle to 3.3 volts. Even the few days I don't get enough power to complete a full charge, mine settle at 3.3 volts.
No, it's not a lot of power. But without the absorption, it will settle. Settling to 3.31 isn't what I would call abnormal. Given the way it was charged.
