<div dir="ltr">Hello, I was called to repair a system. 24 volt 8 strings of Group 31 AGM batteries. I had not self-destructed yet. For the repair, I insisted on the strings being on individual breakers of 20 amps on equal length #12 wire to balance the charging. This is a battery backup system. I recommended replacement of the batteries and a complete rebuild and that I felt the system was unsafe. That was 8 years ago, no problems yet with the system I am hoping the next repair happens before disaster. </div><br><div class="gmail_quote"><div dir="ltr">On Mon, Jul 23, 2018 at 8:56 AM Dave Tedeyan <<a href="mailto:dtedeyan@taitem.com" target="_blank">dtedeyan@taitem.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">
<span style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Since we are on the topic of bad battery practices...</span><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">I may be fixing up a system that was both designed and installed very poorly.</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">They have a 24V Outback VFXR inverter, and ten 12V AGM batteries wired into</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">5 parallel strings. I know that is a bad idea, but since they already have the </div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">equipment, are there any safety issues by re-using this equipment? It is for a </div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">grid tie battery backup system that will remain in float most of the time. I assume </div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">that the batteries will not last particularly long, but is there any harm in using them</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">and then just getting new batteries once they fail?</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">Stringing is shown in the attached picture.</div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">Cheers, </div><div style="font-size:12.8px;text-decoration-style:initial;text-decoration-color:initial">Dave</div>
<br clear="all"><div><div class="m_-7741346767386067427m_-3956851745723301047gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div><div><b><font face="arial, helvetica, sans-serif">--</font></b></div><div><b><font face="arial, helvetica, sans-serif"><br></font></b></div><div><b><font face="arial, helvetica, sans-serif">Dave Tedeyan</font><br></b></div><div><b>Senior Engineer</b></div><div><br></div><div><b>Taitem Engineering, PC</b></div><div>10 Verizon Lane, Lansing, NY 14882</div><div><font color="#000000">Voice: <a value="+16072771118">(607) 930-3481 x6</a></font></div><div><a href="http://www.taitem.com/" target="_blank"><font color="#000000">www.taitem.com</font></a></div></div></div></div></div></div></div></div>
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