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<font size="3" face="Arial">Hi Dave,</font> </p>
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<font size="3" face="Arial">We've been doing some work in this field - all of which is preliminary at this time. By no means would I consider myself an expert but a few things I have garnered over the past couple of years.</font> </p>
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<font size="3" face="Arial">1) Most Iron Phosphate (jelly roll or prismatic) are relatively low capacity resulting in lots of cells to generate meaningful capacity.</font> </p>
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<font size="3" face="Arial">2) Nickel Magnesium Cobalt (NMC) provides a more stable platform (less temp rise) and significantly higher capacity per cell. This allows for fewer cells resulting in easier monitoring and management of each cell.</font> </p>
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<font size="3" face="Arial">3) To echo everyone else BMS is the key to success however, this gets increasingly more difficult if you have 100's of cells.</font> </p>
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<font size="3" face="Arial">4) NMC technology is retailing for ~$1800 kwh or ~60k for a 700AH, 48VDC system (includes BMS).</font> </p>
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<font size="3" face="Arial">Regards,</font> </p>
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<font size="3" face="Arial">Jamie</font> </p>
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>>> "Dave Palumbo" <dave@independentpowerllc.com> 8/21/2011 10:14 PM >>><br> </p>
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<SPAN STYLE='FONT-SIZE:"10.0pt" ;FONT-FAMILY:"Tahoma,sans-serif"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif">We have a potential client for a net metered PV with battery backup system with a serious interest in using lithium ion storage batteries. I do not know of any systems that have used these batteries yet. From some quick calcs I come up with 105 LiFEYPo4 3.2 volt cells. 7 strings of 15 cells for 700 AH at 48 volts. Price is quoted at $ 125 per cell. <o style="font-family: Tahoma,sans-serif; font-size: 10.0pt" p="#DEFAULT"></o style="font-family: Tahoma,sans-serif; font-size: 10.0pt"></span></SPAN> </p>
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<SPAN STYLE='FONT-SIZE:"10.0pt" ;FONT-FAMILY:"Tahoma,sans-serif"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif">Here’s a link the client forwarded from his research.<o style="font-family: Tahoma,sans-serif; font-size: 10.0pt" p="#DEFAULT"></o style="font-family: Tahoma,sans-serif; font-size: 10.0pt"></span></SPAN> </p>
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<a href="http://currentevtech.com/Lithium-Batteries/Thundersky/Thundersky-40ah-cell-p24.html"><SPAN STYLE='FONT-SIZE:"10.0pt" ;FONT-FAMILY:"Tahoma,sans-serif"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif">http://currentevtech.com/Lithium-Batteries/Thundersky/Thundersky-40ah-cell-p24.html</span></SPAN></a><SPAN STYLE='FONT-SIZE:"10.0pt" ;FONT-FAMILY:"Tahoma,sans-serif"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif"><o style="font-family: Tahoma,sans-serif; font-size: 10.0pt" p="#DEFAULT"></o style="font-family: Tahoma,sans-serif; font-size: 10.0pt"></span></SPAN> </p>
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<SPAN STYLE='FONT-SIZE:"10.0pt" ;FONT-FAMILY:"Tahoma,sans-serif"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif">What are the reasons why these are not being used in home power systems? The web site states 3,000 cycles at 80% DOD vs. 750 cycles for typical gel storage batteries. <o style="font-family: Tahoma,sans-serif; font-size: 10.0pt" p="#DEFAULT"></o style="font-family: Tahoma,sans-serif; font-size: 10.0pt"></span></SPAN> </p>
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<SPAN STYLE='FONT-SIZE:"10.0pt" ;FONT-FAMILY:"Tahoma,sans-serif"'><span style="font-size: 10.0pt; font-family: Tahoma,sans-serif">Also, what are your favorite inverter(s) for grid tied with battery backup?</span></SPAN><o p="#DEFAULT"></o> </p>
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David Palumbo<o p="#DEFAULT"></o> </p>
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Independent Power LLC <o p="#DEFAULT"></o> </p>
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462 Solar Way Drive<o p="#DEFAULT"></o> </p>
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Hyde Park, VT 05655<b><o style="font-weight: bold" p="#DEFAULT"></o style="font-weight: bold"></b> </p>
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<b><i>www.independentpowerllc.com <o style="font-style: italic; font-weight: bold" p="#DEFAULT"></o style="font-style: italic; font-weight: bold"></i></b> </p>
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NABCEP Certified PV Installer<o p="#DEFAULT"></o> </p>
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Vermont Solar Partner<o p="#DEFAULT"></o> </p>
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23 Years Experience, (802) 888-7194 <o p="#DEFAULT"></o> </p>
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