<div dir="ltr">William, <div><br></div><div>If the battery cases swelled, they saw over 52 degrees C temps for quite some time. <br><br>While the swelling is usually only cosmetic, what's happening inside is the negative plates are starting to burn. This is where you will start to lose capacity and life cycle... Extended temps of just 35C will half the overall battery life. </div><div><br></div><div>One of the issues with the Outback gear is they only temp compensate at 5mv/Degree/cell. For all the AGM batteries I know of, you need to temp compensate at 4mv. In hot temps, this should help, but cold temps could result in an overcharge. Did you check the BTS and make sure it was operating properly? </div><div><br></div><div>Another issue is that BTSs are often placed on the top or lug of the battery, The top of the battery is about 5-10 deg C cooler than 1/2 way down the side of the battery, Which will also cause problems with proper temperature compensation, especially with warmer/colder extremes. </div><div><br></div><div>Any kind of sulfation will cause an imbalance when you mix old and new batteries. I'm not a fan of mixing any age AGM batteries as there is no way to tell what the SOC of the old bank vs. the new bank is. They are not like flooded batteries; you can check SGs and dissipate heat much better than AGM or GEL batteries. I discourage doing this if you can. I probably wouldn't have mixed the old and new in the same strings. This way, you keep the higher resistance batteries in a single string, </div><div><br></div><div>Lastly, bunching them together with no spacing between them is very bad. Batteries should be in a cool, dry environment. Most battery companies want to see 1-3 inches in between each battery to allow for effective cooling. When they are all bunched up together, that is a lot of thermal mass that doesn't have much chance of cooling. I have seen two parallel strings of AGMs take 24-36 hours with no charging or load to drop from 45c to 25C! <br><br>Hope this helps! Have a good weekend. </div><div><br></div><div><br><br> <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"><img src="https://i.imgur.com/c824e67.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 ⋅
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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 Fri, Jul 22, 2022 at 6:48 PM William Miller 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 lang="EN-US"><div class="gmail-m_5816401678951891908WordSection1"><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">I maintain a system with 16 AGM L-16 batteries. Eight were installed in September of 2021 and 8 were added in March of 2022. This is 5 months apart. I have understood that when you install a string of batteries you have one year in which to add another string before the first string ages to the point it is contraindicated. When I added the second 8 I put 4 new batteries and 4 old batteries in each string.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">About a third of the batteries are discovered to bulging on top. I assume this means the batteries are damaged. I checked the FXR and Outback Extreme Charge controller settings and all were set to absorb at 58.8, and float at 55.2, as the manufacturer recommends. </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">I downloaded the charge controller log and got 129 days of data. In that log I see 68 days where the batteries exceeded 60 VDC. This is over half the days.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">I wonder this:</span></p><p class="gmail-m_5816401678951891908MsoListParagraph"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="gmail-m_5816401678951891908MsoListParagraph" style="margin-bottom:12pt"><span style="font-size:12pt;font-family:Verdana,"sans-serif""><span>1.<span style="font:7pt "Times New Roman""> </span></span></span><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Why did the voltage go up above 58.8 on so many days even though it was set at 58.8. (I set the EQ voltage at 58.8 just in case, but EQ was never engaged.)</span></p><p class="gmail-m_5816401678951891908MsoListParagraph" style="margin-bottom:12pt"><span style="font-size:12pt;font-family:Verdana,"sans-serif""><span>2.<span style="font:7pt "Times New Roman""> </span></span></span><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Did the excess voltage damage the batteries?</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Any input is appreciated.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">Sincerely,</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif"">William Miller</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,"sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">805-438-5600</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif""><a href="http://www.millersolar.com/" target="_blank">www.millersolar.com</a></span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,"sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div></div>
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