I would either do two completely separate 48v packs. Or all in series. If you go all in series, I would never go under 20% of pack capacity because I am almost sure you would reverse the weaker sells. I would not for any reason parallel dissimilar aged lead cells, I have never seen this end up any where but disaster.
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.
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Posted by: James Sizemore <james@deny.org>
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