> Suppose I have a battery bank made up of 4 - 12V Enersys HUP flooded lead > acid batteries. The batteries are wired in series for a nominal 48VDC > system. > > The side of the battery, which is actually a forklift battery, is marked > as 1320 Ah @ C/6. The vendor also rates the battery as 1690 Ah @ C/20. > > So, for the purpose of evaluating the battery back relative to the > charging system settings, what size is the battery bank? > > It is interesting to think that at a normal discharge rate of C/20 I can > get 128% more energy out of the bank (1690 Ah) than I can put back in at a > C/6 charging rate (1320 Ah)? > > Is it fair to say the following: For rapid bulk charging to bring the > voltage up from some discharged voltage of say 48VDC to a bulk charged > voltage of say 60VDC, I want a charger that can provided a constant > current of C/10 or 1320/10 = 132 A across that voltage range. And at the > time that I complete this bulk charge, the battery bank will be restored > to 1320/1690 = 78% of its starting capacity. > > Mark Frye > Berkeley Solar Electric Systems > 303 Redbud Way > Nevada City, CA 95959 > (530) 401-8024 > www.berkeleysolar.com >
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