<div dir="ltr"><div>In my experience, when the LFP batteries are connected in an "Open Loop" (no comms), you typically want 20-30 minutes per parallel connected battery. When connected in closed loop comms, you can set this for much shorter (1/3 to 1/2) as the battery has control over the absorb timers based on the state of charge of all the individual batteries. <br><br>Absorbing for longer will not hurt an LFP that has its own BMS. Still, if you don't absorb long enough, over time, this will cause an imbalance between the batteries and eventually could cause the lower batteries to crater under a surge load. <br><br><br><br></div><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><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 7, 2024 at 4:47 PM Carl Hansen 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">Jeremy,<br>
<br>
   Signature solar techs have told me 30 min.<br>
<br>
  Carl Hansen<br>
<br>
  Hansen&Sun Elect.<br>
<br>
On 2024-11-07 6:31 AM, Jeremy Rodriguez via RE-wrenches wrote:<br>
> Wrenches<br>
> Signature Solar has no absorb time recommendation for their rack mount EG4s !<br>
> I’m setting up a system with a 1200 ah battery stack.  Six in parallel.<br>
> What would be a good absorption time? No battery comms to CCs<br>
> 5925  wPV<br>
><br>
>   <br>
> Jeremy Rodriguez<br>
> Solar Installation / Design<br>
> All Solar, Inc.<br>
> 1453 M St.<br>
> Penrose Colorado 81240<br>
><br>
> Sent by Jeremy's iPhone. Sorry for typos and shorthand.<br>
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</blockquote></div>