Hello, Holt et al~<br><br>If the client only expects 24 hour autonomy, you could build/supply an "uninterruptible power supply" for the police loads only, with no solar recharge dedicated to that system. This would involve inverter/chargers, appropriate safety gear & some monitoring, and a battery bank big enough to carry those loads for the requested 24 hours...and no PV array. <br>
<br>When the grid comes back up, that will drive recharge of the battery. If the client had requested, say, seven days of system autonomy that might point back to connecting up PV to the system, but for 24 hours of ride-through I think it's all about the battery...or the generator system with auto transfer switch per William's suggestion.<br>
<br>Jolliness,<br><br clear="all">Mick Abraham, Proprietor<br><a href="http://www.abrahamsolar.com">www.abrahamsolar.com</a><br><br>Voice: 970-731-4675<br>
<br><br><div class="gmail_quote">On Mon, Feb 1, 2010 at 1:42 PM, <span dir="ltr"><<a href="mailto:holtek@sbcglobal.net">holtek@sbcglobal.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff">
<div>William,</div>
<div>I would agree with generator only if there was the load demand. One thing I
failed to mention is that this will be back-up for lights and communication for
the campus police w/ 24hr autonomy. It looks as though the Sunny Island
route is the most practical at this stage, but I am open for other
suggestions.</div><div class="im">
<div> </div>
<div>Holt E. Kelly<br>Holtek Fireplace & Solar Products<br>500 Jewell
Dr.<br>Waco TX. 76712<br>254-751-9111<br><a href="http://www.holteksolar.com" target="_blank">www.holteksolar.com</a><br></div>
</div><blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"><div><div></div><div class="h5">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">----- Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
<b>From:</b>
<a title="william@millersolar.com" href="mailto:william@millersolar.com" target="_blank">William
Miller</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b> <a title="re-wrenches@lists.re-wrenches.org" href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Cc:</b> <a title="re-wrenches@lists.re-wrenches.org" href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b> Monday, February 01, 2010 12:18
PM</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b> Re: [RE-wrenches] Back-up from
large grid-tie system.</div>
<div><br></div><font size="3">Kelly:<br><br>A big a** generator and a transfer
switch.<br><br>William Miller<br><br>PS: Seriously, I have seen projects
like this and rarely is there a natural subdivision in the power distribution
that allows one to back up a portion of the loads. Backing up a huge
power demand, which I assume this is, is best done by rotating
machinery.<br><br>Wm<br><br><br><br>At 07:52 AM 2/1/2010, <a href="mailto:holtek@sbcglobal.net" target="_blank">holtek@sbcglobal.net</a> wrote:<br>
<blockquote type="cite">Project:<br>43kw system
originally designed as grid-tie. 208 3ph, 6 SB7000(208). Equipment already
rec'd.<br>The curve ball.....client now wants some back-up capabilities that
include solar......there is a 7.92kw sub-array in the system that may be
part of the solution. Any thoughts?<br><br><br><br>Holt E. Kelly<br>Holtek
Fireplace & Solar Products<br>500 Jewell Dr.<br>Waco TX.
76712<br>254-751-9111<br><a href="http://www.holteksolar.com/" target="_blank">www.holteksolar.com</a><br><br>----- Original Message -----
From: "Peter Parrish" <<a href="mailto:peter.parrish@calsolareng.com" target="_blank">peter.parrish@calsolareng.com</a>><br>To:
<<a href="mailto:re-wrenches@re-wrenches.org" target="_blank">re-wrenches@re-wrenches.org</a>><br>Sent: Sunday, January 31, 2010 5:19
PM<br>Subject: [RE-wrenches] Couple of Qustions about AGM
batteries<br><br><br>
<blockquote type="cite">We have put together a 850 Wdc
portable stand-alone PV system. It uses a<br>Blue Sky 3024DiL charge
controller, a pair of SunXtender 250 A-hr AGM<br>batteries (24 volt
configuration), and a Xantrex Prosine 1000 inverter.<br><br>We have been
using this system for powering "events" and getting some good<br>marketing
from the activities. Everything has worked out well, and the<br>system is
not being used now and probably won't until March or
April<br>sometime.<br><br>We have let the system fully charge the
batteries through bulk/absorption<br>and now float. The float conditions
are 26.4 V and 2.0 A at a battery<br>temperature of 21 deg-C.<br><br>My
first question: is it alright to let the batteries float every day
for<br>the next 6 to 8 weeks, or should I disconnect them from the rest of
the<br>system until we are ready to use the system again?<br><br>My second
question: since the 3024iL can perform an equalization, is there a<br>safe
equalization procedure for these AGM batteries?<br><br>-
Peter<br><br>Peter T. Parrish, Ph.D., President<br>California Solar
Engineering, Inc.<br>820 Cynthia Ave., Los Angeles, CA 90065<br>CA Lic.
854779, NABCEP Cert. 031806-26<br><a href="mailto:peter.parrish@calsolareng.com" target="_blank">peter.parrish@calsolareng.com</a><br>Ph
323-258-8883, Mobile 323-839-6108, Fax
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<p><u>Please note new e-mail address and domain:<br><br></u>William
Miller <br>Miller Solar<br>Voice :805-438-5600<br>email:
<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a><br><a href="http://millersolar.com/" target="_blank">http://millersolar.com<br></a>License No.
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