[RE-wrenches] Older iCel System Lithium Ion Batteries

[Ray]

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*
> 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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