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 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
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