[RE-wrenches] Older iCel System Lithium Ion Batteries

Ray ray at solarray.com
Sat Feb 10 19:40:01 EST 2018 

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 <ray at solarray.com 
> <mailto:ray at 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*
>>     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 <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:mtnrider at verizon.net>blue-sky-energy.com
>>>     <http://blue-sky-energy.com>
>>>
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