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<title>Two batteries with an MX60 in between (was big bank)</title>
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<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Mark
- <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>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. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>The
system normally reaches a full charge of 58.4VDC on a regular basis via sun and
wind.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>Thanks,
Dana Orzel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>Great
Solar Works, Inc<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>E -
dana@solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>V -
970.626.5253<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>F -
970.626.4140<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>C -
970.209.4076<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>web
- www.solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>Responsible
Technologies for Responsible People since 1988"</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Mark
Frye<br>
<b>Sent:</b> Saturday, June 26, 2010 6:41 PM<br>
<b>To:</b> 'RE-wrenches'<br>
<b>Subject:</b> [RE-wrenches] Two batteries with an MX60 in between (was big
bank)<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Folks,</span>
<o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>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.</span><o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>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.</span><o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>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 </span><o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>make
it worse.</span> <o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>In
any case, I would want to float out the dormant string as best I could while it
is off-line.</span> <o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>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?</span><o:p></o:p></p>
<p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'> </span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mark Frye</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Berkeley Solar
Electric Systems</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>303 Redbud Way</span>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Nevada
City, CA 95959</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>(530) 401-8024</span>
<br>
<a href="http://www.berkeleysolar.com"><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'>www.berkeleysolar.com</span></a><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span> <o:p></o:p></p>
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