squowse
Solar Enthusiast
- Joined
- Jan 4, 2021
- Messages
- 586
I have put together a 16S 272Ah Lishen cell pack for testing. I neglected these cells a little so not sure what to expect. Some of them were stored for quite a few months empty.
Doing the capacity test, I've rigged up the computer to the UART interface of Jiabaida (JBD) 6S-21S 150A BMS. Model AP21S001.
Early in the test at approx 18.6A I noticed that cell 3 was close to 3.0V already. When checked with voltmeter it measured about 3.17, lower than the others at approx 3.28, but not as drastically low.
Then - even weirder the computer display showed it up at 3.28ish. But the voltmeter still read it close to 3.19!
It's continuing to fluctuate up and down, approximately every minute or so. Actually mostly reading 3.27 now. I will be able to get the plot once the test has concluded. Possibly early, as the BMS may well trip out for low cell voltage.
I've checked the other cells and all read near enough the same on voltmeter as on computer. All 3.28ish with minimal variation so far.
Has anyone experienced something like this? If it was a bad connection (ive checked tightness) how would the voltage end up reading higher?
If the BMS voltage ADC was bad onthat channel - it's a coincidence it happened on the "bad" cell?
Doing the capacity test, I've rigged up the computer to the UART interface of Jiabaida (JBD) 6S-21S 150A BMS. Model AP21S001.
Early in the test at approx 18.6A I noticed that cell 3 was close to 3.0V already. When checked with voltmeter it measured about 3.17, lower than the others at approx 3.28, but not as drastically low.
Then - even weirder the computer display showed it up at 3.28ish. But the voltmeter still read it close to 3.19!
It's continuing to fluctuate up and down, approximately every minute or so. Actually mostly reading 3.27 now. I will be able to get the plot once the test has concluded. Possibly early, as the BMS may well trip out for low cell voltage.
I've checked the other cells and all read near enough the same on voltmeter as on computer. All 3.28ish with minimal variation so far.
Has anyone experienced something like this? If it was a bad connection (ive checked tightness) how would the voltage end up reading higher?
If the BMS voltage ADC was bad onthat channel - it's a coincidence it happened on the "bad" cell?