My experience is the opposite of Carter's. I have 8A4D AGMs in a 48 volt string. I had the lowest (most negative battery fail last year after eight years of service. The other three still seem pretty good but, I went for all new batteries instead of just replacing the bad one. The dead battery had given me trouble a few years before:
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I attributed it to it being the battery that originally was used to power the Paktrakr battery monitoring unit I was using at the time. I think that somehow the parasitic load of Paktraker sulfated that battery a bit. It was not completing the charge cycle. I was able to bring it back to life with multiple charges using my Dual Pro 4 battery charger. It then worked well for the next few years until dying last year. I was hoping to get ten years out of the bank and I probably would have if that battery had not failed as the other batteries seem good. They were operated only allowed to reach 70% and maybe once or twice went to 50%
On Monday, April 10, 2017 10:15 AM, king_of_neworleans <no_reply@yahoogroups.com> wrote:
I use Sams Club Eveready GC-2 6v batteries in series for 48v 220ah. I have not noticed any battery or batteries in the string being more thirsty than the rest. But in your case, since you do notice this, maybe the problem is not cleaning the battery tops and sides enough? You may have a very high resistance ground from the battery terminals, which would manifest itself more strongly toward the positive terminal of the bank. Just guessing. I have gotten somewhat anal over keeping mine clean and the terminals coated with vaseline. Maybe I pay more attention to them than what is strictly needed, I don't know, but I am pretty pleased that they are still going so strongly after 3 years, even though they are so cheap.
Anyway another possible factor is my shore power charger is a 4 bank 12v charger. I charge 2 batteries with each pair of charge leads. I really don't think that assuming good wiring and connections, that it would make a difference vs charging the string at 48v nominal, but electricity seems to me to have an element of chance, fate and sorcery to it so who knows.
Your Trojans are holding up well. Sounds like they have taken a licking in their 4-1/2 years of use. Here's to another 5-1/2 years!
As for rotating them periodically, I certainly don't see what it would hurt. Just a couple hour's work a couple times a year. I can't point to any definite benefit, though, from my own modest knowledge base. Anyway it would make an interesting experiment. Swap the end ones in reverse order and see if the previous positive end batteries are still as thirsty when moved to the negative end of the string. I for one would be interested in your findings. Before you do it, you might try to record empirical data in great detail, even data that you presently don't think is important. You never know what comparisons you might later want to make. When I do stuff like that I never make enough notes, and a year later I don't understand what I recorded, or how.
Anyway another possible factor is my shore power charger is a 4 bank 12v charger. I charge 2 batteries with each pair of charge leads. I really don't think that assuming good wiring and connections, that it would make a difference vs charging the string at 48v nominal, but electricity seems to me to have an element of chance, fate and sorcery to it so who knows.
Your Trojans are holding up well. Sounds like they have taken a licking in their 4-1/2 years of use. Here's to another 5-1/2 years!
As for rotating them periodically, I certainly don't see what it would hurt. Just a couple hour's work a couple times a year. I can't point to any definite benefit, though, from my own modest knowledge base. Anyway it would make an interesting experiment. Swap the end ones in reverse order and see if the previous positive end batteries are still as thirsty when moved to the negative end of the string. I for one would be interested in your findings. Before you do it, you might try to record empirical data in great detail, even data that you presently don't think is important. You never know what comparisons you might later want to make. When I do stuff like that I never make enough notes, and a year later I don't understand what I recorded, or how.
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Posted by: Mike <biankablog@verizon.net>
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