That's why Allan and I only recommend this if a knowledgeable tech is
there to monitor it. It should only take a few minutes to either see
the batteries are just not going to wake up, or for regular charging to
take over. This is basically CPR for the batteries. You don't ever do
it normally, and you stop as soon as: A) nothing is happening, or B) the
battery voltage rises enough for the charge controller to start doing
its job again.
Ray
On 2/10/18 5:03 PM, Darryl Thayer wrote:
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?
On Sat, Feb 10, 2018 at 12:24 PM, Ray <r...@solarray.com
<mailto:r...@solarray.com>> wrote:
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....?!!.)
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.
Ray Walters
Remote Solar
On 2/10/18 1:37 AM, Sindelar Solar wrote:
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.
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.
Allan
--
*Allan Sindelar*
al...@sindelarsolar.com <mailto:al...@sindelarsolar.com>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 <tel:%28505%29%20780-2738> cell*
On 2/9/2018 6:16 PM, Gary Rochlin wrote:
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’m 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’m making sense here.
*Blue Sky Energy *
g.rochlin@ <mailto:mtnri...@verizon.net>blue-sky-energy.com
<http://blue-sky-energy.com>
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