<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>Hi Amanda,</div><div><br></div>Lots of good ideas from the list. <div><br></div><div>I have successfully employed an LFP strategy that used seedling mat heaters and electronic temperature controllers. I found that 60-80W of heating with a temp controller would easily keep most smallish battery banks above 50º in unheated battery areas here in Colorado- and it gets cold here too. Like others, I was worried about the reliability of inexpensive heater mats purchased on Amazon, so I started using wifi temperature controllers that could connect to a customer wifi network and push temperature data and alerts to my phone. With many heated lithium systems in the field for years now, I have yet to have a heating system failure, and I’m surprised at how little energy it seems to take to keep batteries at a safe temperature over the winter. </div><div><div>
<meta charset="UTF-8"><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="text-align: start; text-indent: 0px; overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div>There are viable site-engineered options for the situation you describe.</div><div><br></div><div>Having said all that, I have stopped building battery heater systems due to the appearance on the market of many LFP batteries with pre-engineered cell heating systems. If you have the option to purchase batteries with integral heaters, I’d recommend that as a first choice. </div><div><br></div><div><br></div><div>Luke Christy<br>Renewable energy consultant<br><br>NABCEP Certified PV Installation Professional™: <br><br>Solar Gain Services, LLC<br>PO Box 531<br>Monte Vista, CO 81144</div><div>719.588.3044<br>sgsrenewables@gmail.com</div></div></div>
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<div><br><blockquote type="cite"><div>On Nov 25, 2025, at 12:58 PM, Amanda Potter via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:</div><br class="Apple-interchange-newline"><div><div>Hello all,<br>I’ve been reading past posts regarding Battery Box Heating & am trying to find a simple way to heat an OSB insulated box for various LFP type batteries.<br><br>One Battery Company’s tech support said he uses (at his own home) a 110vac incandescent bulb plugged in to a thermostat (inexpensive) that lets him heat between 32 & 50 degrees F.<br><br>I had somebody suggest the same thing with some Christmas lights.<br>The box & inverter & C.C. are in an un- heated garage on the Canadian border of NY. ( It can, & does get pretty cold up here.)<br><br>Any suggestions?<br><br>It’s Off-Grid & the owners want their Starlink & Security Cameras to be on year round.<br><br>Thanks ahead of time!<br>And, Happy Turkey Day!<br><br>Amanda Potter<br>Energy Storage Systems<br>NABCEP PVIP <br>Adirondack Battery & Solar, LLC<br>(315) 212-2114<br>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>Pay optional member dues here: http://re-wrenches.org<br><br>List Address: RE-wrenches@lists.re-wrenches.org<br><br>Change listserver email address & settings:<br>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br><br>There are two list archives for searching. When one doesn't work, try the other:<br>https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/<br>http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br><br>List rules & etiquette:<br>http://www.re-wrenches.org/etiquette.htm<br><br>Check out or update participant bios:<br>http://www.members.re-wrenches.org<br><br></div></div></blockquote></div><br></div></body></html>