Guru
Joined: 15/07/2006
Location: AustraliaPosts: 676
| Posted: 10:18pm 04 Feb 2012 |
Test 2
All cells were monitored. I took hundreds of photos of my Battery Monitoring Screen. Then many hours going through the screen shots to trace the behaviour of the cells. A random sample has been added to the graph, including the highest and lowest cells of the pack.
Cell 21 mucked me up. The charger output open circuit was too high and so the test was abandoned after 45 minutes when cell 21 became 4.22v.
The results seemed to be a bit more like the expected. High volt cells coming down and low volt cells going up. But take a close look at the cells in the random sample in the middle. The voltage they start from is exactly the same voltage they finish on, no real benefit.
So with a pack voltage of 167vdc, high cell,6 started at 4.05v and low cell, 13 at 3.50v and finishing up at high, cell 25 at 3.73v an low cell, 36 at 3.56v. That's 0.17v difference. The chargers are all measured to be close on 3.7v, so the results are not as they should be.
Trev @ drivebynature.com