<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Hi Mac</div><div dir="ltr"><br></div><div dir="ltr">I don\u2019t know if this is pertinent, but it could be the SOC /fndc getting out of calibration. </div><div dir="ltr"><br></div><div dir="ltr">I\u2019ve seen this happen if % SOC charge termination is on ( default). </div><div dir="ltr">Kinda goes into a negative loop. </div><div dir="ltr"><br></div><div dir="ltr">The other thought is that 2 hr absorb is pretty short for that size bank, but maybe that is OB spec?</div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr">Peltz power. </div><div dir="ltr"><br>On Apr 19, 2019, at 10:27 AM, Mac Lewis <<a href="mailto:maclewis1@gmail.com">maclewis1@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Hello Wrenches,<div><br></div><div>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><br></div><div>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><br></div><div>As per Outback:</div><div>Absorb Voltage is 55.6V for 2 hours</div><div>Float Voltage is 54.0V</div><div><br></div><div>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>2 minute start voltage: 44.8 V.</div><div><br></div><div><br></div><div>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><br></div><div>The load on the system is pretty consistent. They use between 400 and 600W throughout the night.</div><div><br></div><div>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><br></div><div>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><br></div><div>I have and will call Outback about this, but I'd like other perspectives as well.</div><div><br></div><div>Thanks as always for your expertise<br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:'Times New Roman';font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"</font></span></span></font></p></font></b></span></div></div></div></div></blockquote></body></html>