<div dir="ltr">For many LFP batteries, while some say you can charge at the C1 Rate, most want you to charge at the C2 or C3 rate. <div><br></div><div>While you don't have to get them full all the time like lead, as long as you are cycling regularly, it is still a good idea to get them to full regularly. Now if they are a backup system or not being cycled, they should not be held to full all the time. This can accelerate damage to the cells. </div><div><br></div><div>Where we see the major mistakes are the absorb timer settings. Too many people are setting the absorb timers too short, especially if they have parallel modules and are not running closed-loop communications, or the batteries can't communicate with each other or the chargers. </div><div><br></div><div>In these cases where you have 2,3,4... more batteries in parallel, the absorb timers can help balance them as the batteries that don't need balancing stop charging, while the cells that need the extra time get that time if you have longer absorb timers. </div><div><br></div><div>We advise for our LFP drop in's that you have the following. Assuming that you are charging at least the C2 Rate. </div><div><br></div><div>1 Parallel Connection = 30-45 mins absorb timers. </div><div>2 Parallel Connections = 45-60 mins. </div><div>3 Parallel Connections 60-90 mins. </div><div>4 Parallel Connections 90-120 mins </div><div><br></div><div><br></div><div><br></div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div style="float:left;padding:1px 10px 0 0"><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"><img src="https://i.imgur.com/YIluKhq.png" alt="" style="padding:3px 0px 0px 10px;float:left;margin-right:10px;width:98px;height:115px"></a><div style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:14px;line-height:20px;font-family:Arial,Helvetica,sans-serif;margin:0px"><font color="#bb1a1d">Steve Higgins ⋅
</font><span style="color:rgb(64,64,64);font-size:12px">Technical Services Manager</span>
</div>
<div style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:12px;line-height:20px;font-family:Arial,Helvetica,sans-serif;margin:0px"><font color="#bb1a1d">
t</font><span style="color:rgb(184,39,106)">
<span style="font-weight:normal;color:#404040">+1.902.597.4020</span> </span><font color="#bb1a1d">m</font>
<span style="color:rgb(64,64,64);font-weight:normal">+1.206.790.5840</span></div><div style="font-style:normal;font-variant:normal;font-stretch:normal;font-size:12px;line-height:20px;font-family:Arial,Helvetica,sans-serif;margin:0px"><font style="font-weight:bold" color="#bb1a1d">f</font><font color="#cf1d0c" style="font-weight:bold"> </font>+1.902.597.8447 <font style="font-size:12px;font-weight:bold" color="#bb1a1d">e</font><span style="font-size:12px">
</span><span style="font-size:12px"><a href="mailto:steve@surrette.com" style="color:rgb(64,64,64);text-decoration:none" target="_blank">steve@surrette.com</a></span></div>
<div style="padding-top:8px"><a href="http://www.facebook.com/RollsBattery" target="_blank"><img src="http://cdn3.iconfinder.com/data/icons/free-social-icons/67/facebook_square_gray-24.png" alt="" style="border:none"></a><a href="https://www.youtube.com/user/RollsBattery" target="_blank"></a><a href="https://www.youtube.com/RollsBatteryEngineering" target="_blank"></a><a href="https://www.youtube.com/RollsBatteryEngineering" target="_blank"></a><a href="https://www.youtube.com/RollsBatteryEngineering" target="_blank"><img src="http://cdn3.iconfinder.com/data/icons/free-social-icons/67/youtube_square_gray-24.png" alt="" style="border:none;margin-left:5px"></a><a href="https://www.linkedin.com/company/rolls-battery-engineering" target="_blank"></a><a href="https://www.linkedin.com/company/rolls-battery-engineering" target="_blank"></a><a href="https://www.linkedin.com/company/rolls-battery-engineering" target="_blank"><img src="http://cdn3.iconfinder.com/data/icons/free-social-icons/67/linkedin_square_gray-24.png" alt="" style="border:none;margin-left:5px"></a><a href="http://www.instagram.com/RollsBattery" target="_blank"></a><a href="http://www.instagram.com/RollsBattery" target="_blank"><img src="https://cdn3.iconfinder.com/data/icons/free-social-icons/67/instagram_square-24.png" style="margin-left:5px"></a></div><div style="padding-top:8px"><div style="padding-top:0px"><div style="padding-top:0px;max-width:450px"><span style="color:rgb(153,153,153);font-family:Arial,Helvetica,sans-serif;font-size:10px;line-height:10px"><div style="font-size:10px;color:rgb(153,153,153);padding-top:0px"><span style="font-family:Arial,Helvetica,sans-serif;line-height:10px"><span style="font-family:Arial,Helvetica,sans-serif;line-height:10px"><hr style="font-size:10px;color:rgb(153,153,153)"><div style="font-size:10px;color:rgb(153,153,153);padding-top:0px"><span style="font-family:Arial,Helvetica,sans-serif;line-height:10px">CONFIDENTIALITY: </span><span style="color:rgb(153,153,153);font-family:Arial,Helvetica,sans-serif;font-size:10px;line-height:14px">The information transmitted herein is intended only for the addressee and may contain confidential, proprietary and/or privileged material. Any unauthorized review, distribution or other use of or the taking of any action in reliance upon this information is prohibited. If you receive this email in error, please contact the sender and delete or destroy this message and all copies.</span></div><hr></span></span></div><table></table></span></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 26, 2023 at 6:51 PM Darryl Thayer 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="auto">Hi Jay, Larry says is correct. My experience, with cells and there BMS is they need to get up to top balance voltage then the BMS will stop charging the full cells and bring the remainder of cells up to fill charge. My oldest set is about 6 years old, since I understood they have been fine </div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 26, 2023, 3:58 PM Jay 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">Hi All<br>
<br>
I’m wondering if minimum charge amps for lithium is common or not?<br>
<br>
Or does it have to do with the cell shape: cylindrical vs prismatic vs pouch?<br>
<br>
A client purchased some EG4 batteries and they are getting a bit out of balanced. Tech support didn’t suggest higher volts or longer absorb but did mention they need 30-50 amps charge. It’s not in the manual. <br>
<br>
Wondering what you all think and know<br>
<br>
Thx<br>
Jay<br>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" rel="noreferrer" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div>