Thank you for the input. I’m going to purchase a 48V Charger and charger each module and monitor it closely.
From: RE-wrenches [mailto:[email protected]] On Behalf Of Darryl Thayer Sent: Saturday, February 10, 2018 4:03 PM To: RE-wrenches <[email protected]> Subject: Re: [RE-wrenches] Older iCel System Lithium Ion Batteries 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 <[email protected] <mailto:[email protected]> > 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 [email protected] <mailto:[email protected]> NABCEP Certified PV Installation Professional New Mexico EE98J Journeyman Electrician Founder (Retired), Positive Energy, Inc. 505 780-2738 <tel:(505)%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 <mailto:[email protected]> [email protected] <http://blue-sky-energy.com> _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] <mailto:[email protected]> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org <http://www.members.re-wrenches.org> _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] <mailto:[email protected]> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org <http://www.members.re-wrenches.org> _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] <mailto:[email protected]> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org <http://www.members.re-wrenches.org>
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