<div dir="auto">That's probably what I would try also... but be really careful with Li, there may be an issue with the BMS already, doing this could cause thermal runaway... I would probably do so away from any structures, and I would be using an thermal camera to monitor for hot spots. <div dir="auto"><br></div><div dir="auto">I've done this with Li Po RC Batteries and a 12volt regulated power supply... I don't know how they will react to direct array voltage. </div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Feb 10, 2018 12:38 AM, "Sindelar Solar" <<a href="mailto:Allan@sindelarsolar.com">Allan@sindelarsolar.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Gary, you might try an old-fashioned approach: bypass the
controller to send the array straight to the batteries until
threshold voltage is reached. More specifically, bypass one of the
controllers; assuming 48, 60 or 72 Vnom depending on array. Let
the other controller remain in normal operation. Send the
unregulated array to bring initial battery voltage up; then the
other controller takes over and the one that was bypassed now is
reconnected. Better if the unregulated array is the smaller of the
two, I would suspect.<br>
</p>
<p>What I'm suggesting will work with flooded lead-acid, and likely
VRLA lead-acid as well, as long as the unregulated array is taken
out of the system before voltage exceeds bulk. It may not work at
all with these Li-I, as I have no experience with restoring them.
Daryl may well be right about being unrestorable below a threshold
voltage; also the batteries may need an operational BMS to take a
charge. So this is perhaps just food for thought.</p>
<p>Allan<br>
</p>
<div class="m_-7707355972620599214moz-signature">-- <br>
<div class="m_-7707355972620599214WordSection1">
<p class="MsoNormal" style="line-height:normal"><b><span>Allan
Sindelar</span></b><span><br>
</span><a href="mailto:allan@sindelarsolar.com" target="_blank"><span>allan@sindelarsolar.com</span></a><span><br>
</span><span>NABCEP
Certified PV Installation
Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span>Positive
Energy, Inc<span class="m_-7707355972620599214GramE">.</span></span><br>
<b><a href="tel:(505)%20780-2738" value="+15057802738" target="_blank">505 780-2738</a> cell</b></span><span><u></u><u></u></span></p>
<div class="m_-7707355972620599214moz-cite-prefix">On 2/9/2018 6:16 PM, Gary Rochlin
wrote:<br>
</div>
<blockquote type="cite">
<div class="m_-7707355972620599214WordSection1">
<p class="MsoNormal">Does anyone have any information or
specifications for an older circa 2010-2012 iCel System
Lithium Ion Battery. We are doing a repair on an older
48V Lithium Ion system consisting of 3-6 ICel batteries
wired in parallel and 1 Xantrex 6848 and 2 Xantrex Conext
MPPT 60 150 Solar Charge controllers. Via a surge from
SCE system shut down and sat before we were called in.
Batteries are sitting at 6.67V and the charge controller
will not turn on unless the batteries are at 40V since at
the time they were made for lead acid batteries. I\u2019m
looking at finding the way to charge the iCel batteries
or goose the charge controller into thinking 40V are
coming from the batteries. I think I\u2019m making sense
here. </p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#0070c0">Blue Sky Energy
</span></b></p>
<p class="MsoNormal"><span style="color:#0070c0"><a href="mailto:mtnrider@verizon.net" target="_blank"><span style="color:#0070c0;text-decoration:none">g.rochlin@</span></a><a href="http://blue-sky-energy.com" target="_blank">blue-sky-energy.com</a></span></p>
</div>
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