<div dir="auto"><div>I have to agree that the voltage is pretty aggressive for that system. <div dir="auto"><br></div><div dir="auto">With, absob timers they are typically based on how much current is going into the battery bank when in Bulk. </div><div dir="auto"><br></div>The inverter current realistically would be around 130 to 140 amps... at that rate 3.5 to 5 hours at the most... </div><div dir="auto"><br></div><div dir="auto">Generally I would have started around 4 hours and if the SGs sagged I would have added time, reduced time if the SGs rose above 1.275.... </div><div dir="auto"><br></div><div dir="auto">With the array, assuming they have around 6 kw of PV... that'll be around 100 to 120 amps of real current at peak, and to maximize pv production I may have set this to 4 to 6 hours. </div><div dir="auto"><br></div><div dir="auto">I still like to set the inverter charger .2 to .4 less in voltage than the solar charge controller. </div><div dir="auto"><br></div><div dir="auto">I have found, Even today most of the inverters and charge controller dont share true charging info. </div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br><br><div class="gmail_quote" dir="auto"><div dir="ltr">On Wed, Sep 12, 2018, 2:44 AM Mac Lewis <<a href="mailto:maclewis1@gmail.com">maclewis1@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello wrenches,<div><br></div><div>I inspected a system that another company had installed. It had single string of 12 x Trojan L16RE-2V batteries about 2 years old. They had experienced a battery melt-down. It looks as though the meltdown had occurred internally, not from a bad connection.</div><div><br></div><div>The system was dual stack Outback VFXR-3524A inverters (to be precise one was a sealed unit). The set-points were as follows:</div><div>Absorb Voltage was 29.8V</div><div>Absorb Time was 6.0 hours</div><div>Float Voltage was 27.0V</div><div>Rebulk Voltage was 27.0V</div><div>End Amps was 0A</div><div><br></div><div>These settings extended similarly to 2 x FM80 charge controllers.</div><div><br></div><div>I was able to jumper the melted battery and get her power in 15 minutes. Her installer had left her without power for 2 weeks. My clients will kill me if that happened!</div><div><br></div><div>Anyway, I believe these set-points are way out of whack and too aggressive. The voltage is OK (Trojan recommends ~29.6V for this) but the Absorb time seems way too long, Rebulk is too high and end amps isn't helping. However, Im not finding a definitive article from Trojan that describes typical Absorb times or even how to adjust towards a good Absorb Time, based on specific gravity measurements or amperage absorption. </div><div><br></div><div>My diagnosis is that these batteries have been cooked over the past 2 years. In the electrolyte, there is noticeable "floaties". The client said that the original installer had accused her of not using distilled water, but I don't believe that would cause her symptoms. I believe the floaties are plate material.</div><div><br></div><div>I'd be interested in wrenches opinions familiar with these batteries if these are appropriate settings for a low energy user. I will attempt to get through to Trojan as well.</div><div><br></div><div>Thanks in advance</div><div><br></div><div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="m_-4059008712056607778gmail_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">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p></font></b></span></div></div></div>
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