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The cost sounds accurate, considering Blues are 2.5 to 3x the cost of LG Resu's for instance. To minimize sticker-shock, remember they are rated for 8000 0-100%SOC cycles (that's 21 years daily). And certified immune from thermal runaway.<div><br></div><div>I assume we are talking 48v here, not their 850v cabinets. BI 48v cabinets can contain up to 16kwh ea, max configuration is 448kw as I remember, -9- full cabinets is 144kw. You are ok there. A 16 kwh cabinet is rated for 320AH at a nominal 50 vdc (-8- 2kwh mods @ 40 ahr ea.).</div><div><br></div><div>The key is the on-board smart battery management unit, BMU, made by a company called Ageto. it will manage charge and discharge evenly down to the 2kwh battery module level. Each module even has a solid-state "regulator" visible from the front.</div><div><br></div><div>No worries about different cable lengths, inverter/load feed position on the battery bus, etc, as in flooded cell design.</div><div><br></div><div>I've found when paralleling cabinets together, you will be on your own to properly size and protect a DC combiner bus/cabinet.<br><div class="mb_sig"></div><blockquote class="history_container" type="cite" style="border-left-style:solid;border-width:1px; margin-top:20px; margin-left:0px;padding-left:10px;">
<p style="color: #AAAAAA; margin-top: 10px;">On 8/11/2020 9:04:41 AM, William Miller <william@millersolar.com> wrote:</p><div style="font-family:Arial,Helvetica,sans-serif"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Friends:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I am hoping y\u2019all can tell me I am doing something wrong with my arithmetic. I have registered to purchase Blue Planet batteries and priced the product. I come up with math that indicates that comparing usable amp/hours to usable amp/hours, that the Blue Planet is 5 times the cost of a flooded L-16 battery array on a cost per kilowatt/hour. Can this be true?</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I am using these parameters:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoListParagraph" style="margin-left:.75in"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-family:"Verdana","sans-serif";color:#1f497d">DOD for flooded L16s: 50%</span></p><p class="MsoListParagraph" style="margin-left:.75in"><span style="font-family:"Verdana","sans-serif";color:#1f497d"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-family:"Verdana","sans-serif";color:#1f497d">DOD for Blue Planet: 100%</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I hope I am wrong.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Also, we often install battery arrays that are upwards of 4,000 AH. For example, we installed 5,668 of East Penn flooded batteries on a couple of projects. To acquire the same capacity in Blue Planet would require 9 cabinets (again 50% DOD versus 100% DOD). Is this correct design? Is it practical to install 9 cabinets? Does the system detect and compensate for circulating currents in this many parallel strings?</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Thanks in advance.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">William Miller</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><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 [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Jerry Shafer<br><b>Sent:</b> Sunday, August 9, 2020 12:02 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Best Battery</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">Wrenchel have been very happy with all my Blue Planet battery systems, best battery you will install.</p><div><p class="MsoNormal">Jerry</p></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Sun, Aug 9, 2020, 11:19 AM <<a href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a>> wrote:</p></div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><p class="MsoNormal" style="margin-bottom:12.0pt">Hello Wrenches,<br><br>What is the best Li-Ion battery to use with an off grid system?<br><br>Thanks,<br><br>Drake<br>Athens Electric<br><br>-- <br>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">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" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a></p></blockquote></div></div></div></blockquote>
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