<div dir="ltr">Ken,<div><br></div><div>do the LiFePO4's have the same problems if they are stored at a lower voltage, and then just recharged while re-balancing the individual cell voltages prior to use?</div><div><br>
</div><div>-Chris</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Apr 22, 2014 at 3:23 PM, Hugh Fulton via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Ken, I have had a lot of expense with LiFePO4’s. Battery management system BMS is critical and they do not like sitting unused. OK on a daily use vehicle but as they are made in China the individual cell quality is dubious and they need to be matched. It has cost me a lot and I am not in the water. Chs Hugh<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><p class="MsoNormal"><span lang="EN-NZ" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
</div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<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""> Personal_Submersibles [mailto:<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank">personal_submersibles-bounces@psubs.org</a>] <b>On Behalf Of </b>Ken Martindale via Personal_Submersibles<br>
<b>Sent:</b> Wednesday, 23 April 2014 1:51 a.m.<br><b>To:</b> 'Personal Submersibles General Discussion'</span></p><div class=""><br><b>Subject:</b> Re: [PSUBS-MAILIST] Elco Motors<u></u><u></u></div><p></p></div>
</div><div class=""><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Be nice to use the LiFePo4 batteries for the Sub batteries.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Ken Martindale<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<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""> Personal_Submersibles [<a href="mailto:personal_submersibles-bounces@psubs.org" target="_blank">mailto:personal_submersibles-bounces@psubs.org</a>] <b>On Behalf Of </b>via Personal_Submersibles<br>
<b>Sent:</b> Tuesday, April 22, 2014 8:44 AM<br><b>To:</b> <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a><br><b>Subject:</b> Re: [PSUBS-MAILIST] Elco Motors<u></u><u></u></span></p>
</div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Joe, <u></u><u></u></span></p><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">A good idea. Paul M. reckons the dsl/elec hybrid makes for the best psub for the obvious reasons, and so did Captain K. Autonomy is good. If it's 7-8K for the entire system, I would suggest that it ain't bad, considering. Then maybe add a variation on Hank's shaftless coupling, perhaps?<u></u><u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><u></u> <u></u></span></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Arial","sans-serif"">Vance<u></u><u></u></span></p>
<div><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">-----Original Message-----<br>From: Joe Perkel via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>
To: personal_submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Sent: Tue, Apr 22, 2014 7:46 am<br>Subject: [PSUBS-MAILIST] Elco Motors<u></u><u></u></span></p>
<div><table border="0" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" style="padding:0cm 0cm 0cm 0cm"><p class="MsoNormal">Very interesting and informative data on Elco's marine website pertaining to sizing, rates of discharge, range, and hybrid matching <a href="http://www.elcomotoryachts.com/ep-600.shtml" target="_blank">http://www.elcomotoryachts.com/ep-600.shtml</a><br>
<br>I don't think its possible to scratch build the reliability of these particular types of products in the electric boat industry, these are fully engineered systems. At 7-8k, its an expensive motor and would have to be inside with a rotating shaft seal arrangement, but coming from an experimental aircraft perspective the price points on these motors is a comparative bargain. I'm looking at these from a long distance surface transit standpoint for the Seehund.<br>
<br>Joe<a href="http://overview.mail.yahoo.com?.src=iOS" target="_blank"><br><br>Sent from Yahoo Mail for iPad</a><u></u><u></u></p></td></tr></tbody></table></div><div><pre style="background:white"><tt><span style>_______________________________________________<u></u><u></u></span></tt></pre>
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