<div dir="ltr">Is there not a concern that if the batteries are showing such low voltage that they will not accept current, and the voltage will rise to module voltage and put array voltage on the output of the charge controller?</div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 10, 2018 at 12:24 PM, Ray <span dir="ltr"><<a href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Allan has a good approach as long as you are there to monitor
it. The wiring is already there, you just have jump the array
positive to the controller output. ( a little double lugging
never hurt anyone....?!!.) <br>
</p>
<p>Even higher voltage arrays with MPPT can be used this way. They
will just put out close to their short circuit current, as the
batteries will pull the array voltage way down on the IV curve. <br>
</p>
<p>Ray Walters</p>
<p>Remote Solar<br>
</p><div><div class="h5">
<br>
<div class="m_-7980142737407572821moz-cite-prefix">On 2/10/18 1:37 AM, Sindelar Solar
wrote:<br>
</div>
<blockquote type="cite">
<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_-7980142737407572821moz-signature">-- <br>
<div class="m_-7980142737407572821WordSection1">
<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_-7980142737407572821GramE">.</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_-7980142737407572821moz-cite-prefix">On 2/9/2018 6:16 PM, Gary Rochlin
wrote:<br>
</div>
<blockquote type="cite">
<div class="m_-7980142737407572821WordSection1">
<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>
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