<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">The large batteries as everyone else noted are definitely the way to go on off grid systems.<div>You are strengthening the weakest link. However, consider 2 parallel strings. </div><div>I no longer consider a single string to be optimum, after having a large pump on a pair of Outback inverters cause low voltage shutdown with the batteries still at roughly 50% state of charge.</div><div>Also, a single cell failure will take out the entire system until you can get another one shipped in. This can take weeks if not over a month. </div><div>I just measured a 3 string set that is over 10 years old, and has been cycled hard. Cell voltages at rest were within 5%, and current flow under heavy load was within 5% as well.</div><div>Also, industrial batteries are not all created equal, after many years, I think the HUPs are the best. Just check cycle life, warranty, and previous wrench postings. </div><div>Finally, their interconnects can be unbolted, which allows the batteries to be disassembled for moving into tight spaces: a huge bonus.</div><div><div><div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>R. Walters</div><div><a href="mailto:ray@solarray.com">ray@solarray.com</a></div><div>Solar Engineer</div><div><br class="khtml-block-placeholder"></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span>
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<br><div><div>On Oct 29, 2010, at 5:13 PM, <<a href="mailto:dan@foxfire-energy.com">dan@foxfire-energy.com</a>> <<a href="mailto:dan@foxfire-energy.com">dan@foxfire-energy.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div><br></div><div>Hey Folks.. Been eying single string thick plate battery configurations.. Opinions? thanks db<br></div><div><br>Dan Brown<br>Foxfire Energy Corp.<br>Renewable Energy Systems<br>(802)-483-2564<br><a href="http://www.Foxfire-Energy.com/">www.Foxfire-Energy.com</a><br>NABCEP #092907-44</div><div><br></div><blockquote id="replyBlockquote" webmail="1" style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size: 10pt; color: black; font-family: verdana;"><div id="wmQuoteWrapper"><br>
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