<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr"><div>Something else to consider is that many of the modern LFP batteries use a relatively large amount of power just to keep the internal BMS/contactor(s) energized, independent of whether the battery is being charged/discharged. For example, I believe the Fortress eFlex 5.4's use on the order of 12-20 W continuously, *each*. A stack of four generates a significant amount of heat from this alone!</div><div><br></div><div>Cheers,</div><div><br></div><div>Kirk Bailey</div><div><a href="mailto:kirk@abundantsolar.com">kirk@abundantsolar.com</a></div><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 5, 2023 at 12:28\u202fPM Howie Michaelson via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:verdana,sans-serif">Daryl,</div><div style="font-family:verdana,sans-serif">Being in Vermont and dealing with lots of off-grid, occasional use systems, I'm definitely interested in others' experience with cold weather installations.<br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr">Howie Michaelson</div><div dir="ltr"><div style="font-family:verdana,sans-serif">Sun Catcher<br></div><br></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 5, 2023 at 3:03\u202fPM Darryl Thayer via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="font-family:times new roman,serif;font-size:large">Great site, Allan, but many facts still need to be included. Was there a discharge or charge going on? How much power was being drawn by the heaters? If this is for a standalone system, energy consumption is very important. What is the lower temperature cell discharge limit of Blue Planet? What concern was taken for the summer and overheating? What are the blue planet-specific heat and weight of the batteries? More questions, but I doubt if anyone else is interested. Thank you.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 26, 2023 at 11:49\u202fAM Sindelar Solar via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div bgcolor="#FFFFFF">
You might be able to get some ideas from this. It's worked well for
me on one job.<br>
Allan<br>
<br>
<div>On 10/25/2023 2:24 PM, Dana Orzel via
RE-wrenches wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">I
know we have had this run thru before & wanted to see if
any new options for heating LI batteries.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">I
have an 8 pack of Homegrid LI batteries that is off grid
with Radian 8048a. Originally, they were not going to be
there for the winter, now it is a possibility they may
visit. Plenty of solar 6KW+, hopefully generator back up
waiting on delivery currently.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Currently
located in main room high ceilings/log cabin.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Looking
at creating an insulated closet & using terrarium
heaters controlled if over 51volt heater on AC from
inverter. Or just boxing in with 3-4\u201d of blue board
Styrofoam\u2026.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Has
anyone else done something similar?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Has
anyone done this & it did not work?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Thought
& suggestions\u2026..<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif">_________________________________________________________<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif;color:rgb(56,86,35)">Dana
Orzel </span><span style="font-size:12pt;font-family:"Century Gothic",sans-serif;color:rgb(56,86,35)">GREAT
SOLAR WORKS! <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif;color:rgb(56,86,35)">C
\u2013 208.721.7003 E \u2013 <a href="mailto:dana@solarwork.com" target="_blank"><span style="color:rgb(56,86,35);text-decoration:none">dana@solarwork.com</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif;color:rgb(56,86,35)">W
- www. <a href="http://greatsolarworks.com" target="_blank">greatsolarworks.com</a> <a href="http://www.solarwork.com/" target="_blank"><span style="color:rgb(56,86,35);text-decoration:none">www.solarwork.com</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><i><u><span style="font-size:12pt;font-family:"Century Gothic",sans-serif;color:rgb(56,86,35)">\u201cResponsible
Technologies for Responsible People since 1988!\u201d<u></u><u></u></span></u></i></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<br>
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<p class="MsoNormal" style="line-height:normal"><b><span style="font-size:12pt;font-family:"Times New Roman",serif">Allan Sindelar</span></b><span style="font-size:12pt;font-family:"Times New Roman",serif"><br>
</span><a href="mailto:allan@sindelarsolar.com" target="_blank"><span style="font-size:10pt;font-family:"Times New Roman",serif">allan@sindelarsolar.com</span></a><span style="font-size:12pt;font-family:"Times New Roman",serif"><br>
</span><span style="font-size:10pt;font-family:"Times New Roman",serif">RETIRED</span><span style="font-size:12pt;font-family:"Times New Roman",serif"><u></u><u></u></span></p>
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