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 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:[email protected]>blue-sky-energy.com
_______________________________________________
List sponsored by Redwood Alliance
List Address: [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
Check out or update participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Redwood Alliance
List Address: [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
Check out or update participant bios:
www.members.re-wrenches.org
