Re: [RE-wrenches] 24V Rolls Charging Parameters?

[Allan Sindelar]

Well, if had been set up at 48V instead of 24V, it would have been a well-designed system. Would have cost less, too - two parallel strings of batteries instead of four for the same capacity, and three controllers instead of five. But as it is... Your array is large enough to achieve roughly a C/10 rate when charging (8,000W/24 Vnom = 333 A; 820 A/hr X 4 strings (shudder) is 3,280 A/hr; 3,280/333 = C/9.8), so that you can set a fairly strong charge rate. I'd do 29.2-29.4, depending on loads, 4 hours of absorption with a Done Amps at ~2% (66-75A) and float at 26.6-26.8. EQ at 31.2, manual initiation. Having stuck my neck out, now let me learn from the rest of you. Allan Allan Sindelar al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc. 3209 Richards Lane (note new address) Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com On 4/29/2013 3:15 PM, Wayne Irwin wrote: Hello Wrenches, Please provide your opinions on the proper charging voltages (e.g. bulk, float, eq,), and recommended durations. The bank consists of 12 - Rolls 8CS25P (820AH @ 20hr rate) (4 strings of 3). Design based partly on budget limitations. FYI. The system is off grid and consists of an 8KW array, 2 - OB VFX 3524 Inv's. and 5 - OB MX80 CC's. I have general parameters programmed based on AH's but would like to have additional opinions/suggestions to compare and/or see if there is something that I have missed. I have not yet received any feedback from Rolls tech support ..... James? Thanks in advance for your help, Wayne Irwin, President License #CVC56695 State Licensed Solar Contractor Pure Energy Solar International Inc. wa...@pureenergysolar.com http://PureEnergySolar.com 352 377-6527 Office 352 336-3299 Fax The content of this message is Pure Energy Solar Confidential. If you are not the intended recipient and have received this message in error, any use or distribution is prohibited. Please notify me immediately by reply e-mail and delete this message from your computer system. Thank you. _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org

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