That's probably what I would try also... but be really careful with Li, there may be an issue with the BMS already, doing this could cause thermal runaway... I would probably do so away from any structures, and I would be using an thermal camera to monitor for hot spots.
I've done this with Li Po RC Batteries and a 12volt regulated power supply... I don't know how they will react to direct array voltage. On Feb 10, 2018 12:38 AM, "Sindelar Solar" <al...@sindelarsolar.com> 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 > NABCEP Certified PV Installation Professional > New Mexico EE98J Journeyman Electrician > Founder (Retired), Positive Energy, Inc. > *505 780-2738 <(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 * > > g.rochlin@ <mtnri...@verizon.net>blue-sky-energy.com > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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