[RE-wrenches] Older iCel System Lithium Ion Batteries

[Sindelar Solar]

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*
allan at sindelarsolar.com <mailto:allan at 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:mtnrider at verizon.net>blue-sky-energy.com
>
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