My Screwy 31
First off let me say I am not stressing over this. It's just a battery, it is only money, it is meeting my overnight needs, but it is displaying strange behavior, and I am curious as to why. So th...
Forum Discussion
Mex is sort of a Delphic oracle at times, but you do have to interpret.
While it is "pure" to compare the same battery before and after and that you can get funny answers comparing dis-similar batteries, you can still get a good idea of what is going on by comparing dis-similar batteries.
That is because batteries aren't all that dis-similar. I have two used 12v Trojan T-1275s, two Interstate 6v GC2-XHDs, and two Exide 6v G135s and they all act pretty much the same, so I just pretend they are all the same and it works out fairly closely when they are banked as a 6-battery bank as one big battery.
The recharge/discharge is proportionate to four 6s or two 6s or two 12s doesn't matter. All you need is a Trimetric and watch the accumulated AH come and go vs the "morning voltage." Comes out the same. Even their SGs per voltage and AH count is the same.
Pretending they are the same works "well enough" at least the way I do it.
When testing them, I do the same 10hr test at their 20hr rate and that comes out right too. Now these are all true deep cycle batteries, so I am not saying that you can compare a deep cycle with a starting battery and get the same results. That would be too much dis-similar.
While it is "pure" to compare the same battery before and after and that you can get funny answers comparing dis-similar batteries, you can still get a good idea of what is going on by comparing dis-similar batteries.
That is because batteries aren't all that dis-similar. I have two used 12v Trojan T-1275s, two Interstate 6v GC2-XHDs, and two Exide 6v G135s and they all act pretty much the same, so I just pretend they are all the same and it works out fairly closely when they are banked as a 6-battery bank as one big battery.
The recharge/discharge is proportionate to four 6s or two 6s or two 12s doesn't matter. All you need is a Trimetric and watch the accumulated AH come and go vs the "morning voltage." Comes out the same. Even their SGs per voltage and AH count is the same.
Pretending they are the same works "well enough" at least the way I do it.
When testing them, I do the same 10hr test at their 20hr rate and that comes out right too. Now these are all true deep cycle batteries, so I am not saying that you can compare a deep cycle with a starting battery and get the same results. That would be too much dis-similar.
