Capacity Testing and 20 HR Rating
I'm thinking about doing a capacity test on my four GC2's. They have a 20hr rating of 215Ah. One thing I'm curious about is how the 20hr rating would have been determined. Being 6v, would they h...
Forum Discussion
Regarding Vbatt:
OCV was at 12.86v just before test. Once the load was applied, Vbatt dropped to 12.35v. In the first 15 minutes, it dropped to 12.26, but then held steady in the 12.6-7v range for the next 45 minutes, or so. After that, it dropped a little quicker to 12.22v, but then continued to drop in a slightly curved fashion, at a rate of a little under 0.02v every 15 minutes, increasing to a little over 0.02v every 15 minutes. After 9 hours, Vbatt drop had increased to about 0.03v every 15 minutes. So nothing unusual, as far as I can tell. In fact, I'd say that makes for a pretty nice voltage curve.
At 2 1/2 hrs, Vbatt was 12.18v,
At 5 hrs ... 12.02v
At 7 1/2 hrs ... 11.82v
At 10 hrs ... 11.58v
One hour later, OCV was at 12.14v and rising slowly, so I settled on 12.15v as my 50% ocv.
OCV was at 12.86v just before test. Once the load was applied, Vbatt dropped to 12.35v. In the first 15 minutes, it dropped to 12.26, but then held steady in the 12.6-7v range for the next 45 minutes, or so. After that, it dropped a little quicker to 12.22v, but then continued to drop in a slightly curved fashion, at a rate of a little under 0.02v every 15 minutes, increasing to a little over 0.02v every 15 minutes. After 9 hours, Vbatt drop had increased to about 0.03v every 15 minutes. So nothing unusual, as far as I can tell. In fact, I'd say that makes for a pretty nice voltage curve.
At 2 1/2 hrs, Vbatt was 12.18v,
At 5 hrs ... 12.02v
At 7 1/2 hrs ... 11.82v
At 10 hrs ... 11.58v
One hour later, OCV was at 12.14v and rising slowly, so I settled on 12.15v as my 50% ocv.
