I would agree with your comments -
Peukert is a HUGE factor at higher currents. But if the drain relative to the capacity is not too bad, I would much rather have the "warm fuzzy" feeling of a second bank. Stuff happens. I really like the idea of a backup, as long as it's not costing me too much in maint.
John
From: king_of_neworleans <no_reply@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Thursday, February 2, 2017 9:56 AM
Subject: [Electric Boats] Adding batteries in series to an existing bank... thoughts?
Hi everybody. First of all, please turn your flamethrowers down to "warm". I know that the right way to build a battery bank is to buy all at once, same mfgr date and lot number, etc, but I bought what I could afford, instead of dreaming about what I could not. So, I have a bank of 8 6v golf cart batteries and they have performed well, with no loss of performance after 3 years of moderate use and careful maintenance. I am quite happy at how they have performed, especially since they only cost $85/ea, at 220ah. In fact I am so happy with them that I will be buying 8 more in a few weeks. My new controller will work with up to 120v. I have a ME0913 motor that should work just fine at 96v. So this begs the question... separate 48v banks, one big bank in parallel/series at 48v, or all batteries, new and old, in series for 96v? Intuitively I think I would want to stay away from running the new and the old in parallel. As for separate banks, yes, I know Mr Peukert will hit me on the two banks vs one big one, but I seldom run over 10a anyway, so Peukert isn't as big an issue as if I were operating at 50 or 60 amps. Series seems to me to be the lesser of three weevils but the twin banks does offer a warm fuzzy secure feeling, knowing that however much power I have used from one bank to get OUT, I have that much power in the second bank to get back IN. As I mentioned, the old batteries are still working great. I have not abused them at all, only equalized them three times, and they still deliver the juice like new, even slightly better than new. I think I am looking at at least two more years of solid use, and reasonable compatibility with brand new batteries of the same specs in series.
I will add that I don't have much specific knowledge or experience with high power DC setups, so if I go with 96v I know I will have some homework to do.
So what do you think, guys? I can do my own guessing and conjecturizing, so please, I would like very much to hear knowledgeable knowledge and not just opinionated opinions. Actual experiences you can share with me would be especially cherished.
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Posted by: oak <oak_box@yahoo.com>
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