<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Mac,<div class=""><br class=""></div><div class="">Only removing 6kWh from 46kWh of storage should not be able to produce the voltage sag to trigger AGS. That\u2019s only about 13% at a 100Hr rate. Voltage should be no where near that point. Have you verified actual voltage when the AGS is triggered? Loose wiring or terminal corrosion can cause voltage drop but I would think that an easy find/repair you would have checked.</div><div class=""><br class=""></div><div class="">Saying the battery easily charges to 100% worries me as sulfated batteries do that. Healthy LA batteries take many hours to reach full saturation. Has cell voltage been compared for non-uniformity? Has the equalization charge been performed? </div><div class=""><br class=""></div><div class="">I am not a fan of the unusual low voltages that Outback prescribes for EnergyCells and seriously wonder how these voltages can properly maintain these cells. CV is below the point where balanced O2 and H2 evolution takes place. But, thats off point.</div><div class=""><br class=""><div class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><br style="orphans: 2; widows: 2;" class=""><span style="orphans: 2; widows: 2;" class="">Larry Crutcher</span><br style="orphans: 2; widows: 2;" class=""><span style="orphans: 2; widows: 2;" class="">Starlight Solar Power Systems</span><br style="orphans: 2; widows: 2;" class=""></div></div></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline" style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class="Apple-interchange-newline">
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<br class=""><div><div class="">On Apr 19, 2019, at 10:27 AM, Mac Lewis <<a href="mailto:maclewis1@gmail.com" class="">maclewis1@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hello Wrenches,<div class=""><br class=""></div><div class="">We recently inherited an Outback system that I've been keeping an eye on via Optics. Its a dual stack 3648 VFXR, with about 4kW of PV with a single string of EnergyCell 1100RE battery bank (reported to be ~6 months old) ~.46 kWh at C20.</div><div class=""><br class=""></div><div class="">I have been observing how the system functions and how the voltage behaves. We keep getting 2 minute voltage starts on the generator in the middle of the night that don't seem necessary judging from how much energy has been used from the battery bank. I am hesitant to tweak anything because these battery set-points are a bit different than I'm used to.</div><div class=""><br class=""></div><div class="">As per Outback:</div><div class="">Absorb Voltage is 55.6V for 2 hours</div><div class="">Float Voltage is 54.0V</div><div class=""><br class=""></div><div class="">I've slowly been dropping the 2 minute start voltage to see if there is a bottom, but I'm hesitant to take it much lower (maybe I should). </div><div class="">2 minute start voltage: 44.8 V.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">The system easily charges the battery bank to 100% (and easily reached the 2 hr absorb time) every day. The flexnet DC is correctly set up and calibrated.</div><div class=""><br class=""></div><div class="">The load on the system is pretty consistent. They use between 400 and 600W throughout the night.</div><div class=""><br class=""></div><div class="">An average night, they may use about 6 kWh before the voltage sags below the 2 minute start voltage and it starts the generator.</div><div class=""><br class=""></div><div class="">Just curious if our 2 minute voltage needs to be dropped or if these batteries are degraded. What corrective changes can I make to get better performance?</div><div class=""><br class=""></div><div class="">I have and will call Outback about this, but I'd like other perspectives as well.</div><div class=""><br class=""></div><div class="">Thanks as always for your expertise<br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div class=""><br class=""></div><div class=""><font color="#305A78" face="'times new roman', serif" class=""><br class=""></font></div><div class=""><br class=""></div>Mac Lewis<br class=""><br class=""><span style="font-family: 'Times New Roman'; font-size: inherit; color: rgb(255, 153, 0);" class=""><b class=""><font face="Arial, Helvetica, sans-serif" size="3" class=""><p align="left" class=""><font face="Verdana, Arial, Helvetica, sans-serif" class=""><span style="font-size:small" class=""><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)" class=""><font face="'times new roman', serif" class="">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)" class=""><font face="'times new roman', serif" class="">-Sócrates</font></span></span></span></font></p></font></b></span></div></div></div>
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