<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Wayne,<div>In the first place, 4 parallel strings of anything is a very bad idea. Micro resistances in cabling and connections plus eddy currents and the like will, over time, inherently unbalance the pack. Doing frequent EQ charges will be required but will not overcome the inherently bad design of too many parallel strings. If you want to stay with Surrette, one string of 24 2-YS-31PS will give you about the same capacity in one tasty, electrically happy string. Lots more money, I get that, but that would be the ideal situation. As a fallback, do yourself a favor and spec out 12 of the 4KS-21PS so that you have just two parallel strings. Should even be a little less dough.</div><div>Jamie Surette (<a href="mailto:james@surrette.com">james@surrette.com</a>) is usually pretty good at returning emails and calls. His would be, without doubt, your best opinion as to a proper charge regime for his batts.</div><div>Good Luck. If you go with four strings, you'll need it.</div><div>bob-O</div><div><br></div><div><br><div><div>On Apr 29, 2013, at 2:15 PM, Wayne Irwin wrote:</div><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div class="hmmessage" style="font-size: 12pt; font-family: Calibri; "><div dir="ltr"><font size="2" style="font-size: 10pt; ">Hello Wrenches,<br><br><font size="2" style="font-size: 10pt; ">Please provide yo<font size="2" style="font-size: 10pt; ">ur<font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span></font>opinions on the proper<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">char<font size="2" style="font-size: 10pt; ">ging</font></font></font></font></font><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>voltages</font></font></font></font></font></font></font><span class="Apple-converted-space"> </span></font>(e.g. bulk<font size="2" style="font-size: 10pt; ">, float, eq<font size="2" style="font-size: 10pt; ">,<font size="2" style="font-size: 10pt; ">),</font><font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>and recommended duration<font size="2" style="font-size: 10pt; ">s<font size="2" style="font-size: 10pt; ">.</font><br><br><font size="2" style="font-size: 10pt; ">The bank consists of 12 - Rolls 8CS25P (820AH @ 20hr rate) (4 strings of 3). Design<font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>based partly on budget limitations<font size="2" style="font-size: 10pt; ">.</font></font><br><font size="2" style="font-size: 10pt; "><br>FYI<font size="2" style="font-size: 10pt; ">.<span class="Apple-converted-space"> </span></font>The system<font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>is off grid and<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">con<font size="2" style="font-size: 10pt; ">s<font size="2" style="font-size: 10pt; ">ists of an<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">8KW array,</font><span class="Apple-converted-space"> </span>2<font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>- OB VFX 3524 I<font size="2" style="font-size: 10pt; ">nv's.<span class="Apple-converted-space"> </span></font>an<font size="2" style="font-size: 10pt; ">d 5 - OB MX<font size="2" style="font-size: 10pt; ">80 CC's.</font></font></font></font></font></font></font></font><br><br><font size="2" style="font-size: 10pt; "><font size="2" style="font-size: 10pt; ">I have gener<font size="2" style="font-size: 10pt; ">al parameters<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">programmed based on AH's but woul<font size="2" style="font-size: 10pt; ">d like to<font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>have addition<font size="2" style="font-size: 10pt; ">al opinions/suggestions to<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">compare and<font size="2" style="font-size: 10pt; ">/or see if there is<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">something that I have missed</font></font></font>.<br><br>I have not yet<span class="Apple-converted-space"> </span><font size="2" style="font-size: 10pt; ">received</font><span class="Apple-converted-space"> </span>any feedback from Rolls t<font size="2" style="font-size: 10pt; ">ech support ..... James?</font><br><br><font size="2" style="font-size: 10pt; ">Thanks in advance<font size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span>for your help,</font></font><br id="FontBreak"></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font><br><br><font color="#76923C" size="2" style="font-size: 10pt; ">Wayne Irwin</font><font color="#76923C" size="2" style="font-size: 10pt; ">,<br></font><font color="#76923C" size="2" style="font-size: 10pt; ">President</font><br><font color="#76923C" size="2" style="font-size: 10pt; ">License #CVC56695<span class="Apple-converted-space"> </span></font><font color="#76923C" size="2" style="font-size: 10pt; "><br></font><font color="#76923C" size="2" style="font-size: 10pt; ">State Licensed Solar Contractor</font><br><font color="#76923C" size="2" style="font-size: 10pt; ">Pure Energy Solar International Inc.<span class="Apple-converted-space"> </span></font><font color="#76923C" size="2" style="font-size: 10pt; "><br></font><font color="#76923C" size="2" style="font-size: 10pt; "></font><font color="#76923C" size="2" style="font-size: 10pt; "><a href="mailto:PureEnergySolar@hotmail.com">Wayne@PureEnergySolar.com</a></font><font color="#76923C" size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span></font><font color="#76923C" size="2" style="font-size: 10pt; "><br></font><font color="#76923C" size="2" style="font-size: 10pt; "></font><font color="#76923C" size="2" style="font-size: 10pt; "><a href="http://pureenergysolar.net/" target="_blank">http://PureEnergySolar.com</a></font><font color="#76923C" size="2" style="font-size: 10pt; "><span class="Apple-converted-space"> </span></font><font color="#76923C" size="2" style="font-size: 10pt; "><br></font><font color="#76923C" size="2" style="font-size: 10pt; "></font><font color="#76923C" size="2" style="font-size: 10pt; ">352 377-6527 Office</font><font color="#76923C" size="2" style="font-size: 10pt; "><br></font><font color="#76923C" size="2" style="font-size: 10pt; ">352 336-3299 Fax</font><font color="#76923C" size="2" style="font-size: 10pt; "><br></font><font color="#76923C" size="2" style="font-size: 10pt; "><br><br></font><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><font color="#76923C" size="2" style="font-size: 10pt; "><span style="font-family: Arial, sans-serif; ">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.</span></font></div></div>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address:<span class="Apple-converted-space"> </span><a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Change email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive:<span class="Apple-converted-space"> </span><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br><br>Check out participant bios:<br><a href="http://www.members.re-wrenches.org/">www.members.re-wrenches.org</a><br><br></div></span></div><br></div></body></html>