Mark -
We have an installation that has [3] 1990 Ahr HUP solar one battery banks and there is not enough charge for EQ capacity. So we fused each bank at 250ahr separately while it is wired in a reverse-return series/parallel configuration [sorry to throw in the plumbing jargon there] and can remove one or two banks to dedicate full charge capacity to each bank. It takes a little longer but with full sun and the generator it meets the need without adding additional chargers. So far the SG readings are all dead on. The system normally reaches a full charge of 58.4VDC on a regular basis via sun and wind. Thanks, Dana Orzel Great Solar Works, Inc E - [email protected] V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 web - www.solarwork.com Responsible Technologies for Responsible People since 1988" From: [email protected] [mailto:[email protected]] On Behalf Of Mark Frye Sent: Saturday, June 26, 2010 6:41 PM To: 'RE-wrenches' Subject: [RE-wrenches] Two batteries with an MX60 in between (was big bank) Folks, As you may recall I have 4 strings of 4 batteries parralleled into a single bank. Each string is 1690Ah @ 48V. The charging system for this bank is undersized. I think I would do better by reducing the bank size by running only 3 strings. However, I don't want to strand the fourth string. I am wondering what rotating the strings might look like. One string would be removed from the bank for a period of perhaps a month. Then it would go back on-line and onother string would be taken off-line, and so on. Right away I worry about accelerating the divergence of the strings in terms of resistence to charging. Going to three stings would reduce this problem, but trying to rotate strings might make it worse. In any case, I would want to float out the dormant string as best I could while it is off-line. Would it work to attached the DC input of an MX60 to the on-line bank of three strings, and the output to the off-line sting, and let the MX keep the off-line string in float? Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 <http://www.berkeleysolar.com> www.berkeleysolar.com No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.830 / Virus Database: 271.1.1/2963 - Release Date: 06/25/10 12:35:00
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