<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Hi William,</div><div dir="ltr"><br></div><div dir="ltr">I dont do the math based on up front kwh cost, but on lifetime kWh based on the number of cycles per average DOD that are going to be used. I use this same formula to compare all batteries to each other.&nbsp;</div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br></div><div dir="ltr">Peltz power.&nbsp;</div><div dir="ltr"><br></div><div dir="ltr">For example, a Rolls L16 ex has 3500 cycles at 50% DOD, and it\u2019s a 371 amp hr at 6v &nbsp;or 2.226 kWh&nbsp;</div><div dir="ltr">Retail is $400&nbsp;</div><div dir="ltr"><br></div><div dir="ltr">3500 cycles x 1.1 kWh At 50 DOD=3850 kWh&nbsp;</div><div dir="ltr">$400 / 3850 kWh = $.10 kWh&nbsp;</div><div dir="ltr">10 years of 50% cycling daily&nbsp;</div><div dir="ltr"><br></div><div dir="ltr">Compared to say a mid grade US battery, 1400 cycles to 50%, 400 amp hr. 2.4 kWh&nbsp;</div><div dir="ltr">$325/1680 kWh = $.19 kWh.&nbsp;</div><div dir="ltr">3.8 yrs life</div><div dir="ltr"><br></div><div dir="ltr">Compare to say BI</div><div dir="ltr">$1000 kWh roughly.&nbsp;</div><div dir="ltr">If you get 10,000 cycles, that works out to same cost. $.10 per kWh.&nbsp;</div><div dir="ltr">27 yrs, but will the chemistry actually last that long?</div><div dir="ltr">However, you have a massive upfront money cost.&nbsp;</div><div dir="ltr">And for those of us off grid, you can\u2019t really cycle 100%. And many lithium in the fine print don\u2019t want you to charge to 100% daily. Let\u2019s assume you start the generator at 10% and charge to 95%, now your usable amount is actually 85%, not 100%. &nbsp;</div><div dir="ltr">Cost per kWh goes to $.12. &nbsp;</div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><blockquote type="cite">On Aug 11, 2020, at 6:04 AM, William Miller &lt;william@millersolar.com&gt; wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">\ufeff<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
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--></style><div class="WordSection1"><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">Friends:</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">I am hoping y\u2019all can tell me I am doing something wrong with my arithmetic.&nbsp; I have registered to purchase Blue Planet batteries and priced the product.&nbsp; 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.&nbsp; Can this be true?</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">I am using these parameters:</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoListParagraph" style="margin-left:.75in"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d"><span style="mso-list:Ignore">1.<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp; </span></span></span><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">DOD for flooded L16s: 50%</span></p><p class="MsoListParagraph" style="margin-left:.75in"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d"><span style="mso-list:Ignore">2.<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp; </span></span></span><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">DOD for Blue Planet: 100%</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">I hope I am wrong.</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">Also, we often install battery arrays that are upwards of 4,000 AH.&nbsp; For example, we installed 5,668 of East Penn flooded batteries on a couple of projects.&nbsp; To acquire the same capacity in Blue Planet would require 9 cabinets (again 50% DOD versus 100% DOD).&nbsp; Is this correct design?&nbsp; Is it practical to install 9 cabinets?&nbsp; Does the system detect and compensate for circulating currents in this many parallel strings?</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">Thanks in advance.</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">William Miller</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><span style="font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1f497d">&nbsp;</span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> 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">&nbsp;</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">&nbsp;</p><div><div><p class="MsoNormal">On Sun, Aug 9, 2020, 11:19 AM &lt;<a href="mailto:drake.chamberlin@redwoodalliance.org">drake.chamberlin@redwoodalliance.org</a>&gt; 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" t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