The 2V L16's are 2V one cell. The 6 volt L16's are (3) 2 volt cells but you should see the SG being way off, right?
Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ > That was my point: voltage is not very helpful on the 2 v L16s, as all 3 > cells are internally paralleled. With the Flir I was able to see all > the dead cells in the set in seconds. > > R. Ray Walters > Chief Technical Officer, RemoteSolar.com > BS Mech Engineering, 1988 > Former NABCEP Certified, 2004-2016 > Licensed Master ELectrician, Colorado > 303 505-8760 > > On 4/27/17 10:22 AM, Dave Angelini Offgrid Solar wrote: >> The FLIR is nice but SG and voltage would have told the same thing, >> would >> it not? >> I have excellent experience with the L16 2V cells but will be switching >> to >> the LG RESU 10 very soon for my clients. >> >>> Here's a thermal image from a recent inspection of 2 v Trojan L16REs. >>> Notice the normal batteries above and below, they are cool blue, >>> running >>> around 75F >>> >>> 2 of the cells of the center battery are obviously shorted. Cell >>> voltage was 2.07 v compared to about 2.3 to 2.4 v for surrounding good >>> batteries. Dead cells are much easier to find on 6 v batteries. I >>> wouldn't have found this without the Flir 167. >>> >>> About 1/4 of the batteries in this set had hot cells; 25 -30 deg F >>> warmer. Obviously time for some fresh lead. Owner couldn't recall how >>> old the set was, he thought 2 to 4 years. Rated at 1000 cycles to 80% >>> DOD, these Trojan RE batteries should do much better than that. I have >>> never been impressed with L16s anyway. John, my experience has also >>> been: higher Capacity = more premature cell failures. >>> >>> R. Ray Walters >>> Chief Technical Officer, RemoteSolar.com >>> BS Mech Engineering, 1988 >>> Former NABCEP Certified, 2004-2016 >>> Licensed Master ELectrician, Colorado >>> 303 505-8760 >>> >>> On 4/26/17 2:09 PM, John Blittersdorf wrote: >>>> Wallace, >>>> I installed some Interstate RE batteries (green case) L16's that >>>> supposedly are made by US Battery. As with Trojan and other High >>>> Capacity L16's I had several cell failures. I have always felt that >>>> gleaning more amp hours from the same box must lead to cutting corners >>>> on robustness. I have found that often when the batteries are full, >>>> they work OK for awhile but as the voltage drops and the current flow >>>> rises, the cell will eventually drop out. Other adjacent batteries in >>>> the string often overcharge to compensate. In my case with the green >>>> batteries, they were about 2 years old as well. I took them back to >>>> my distributor and replaced them with standard L16's at a special pro >>>> rated price. I have found that all lead acid batteries that have >>>> problems seem to first have a cell failure somewhere along the line >>>> and finally the capacity diminishes to the point that it is an >>>> annoyance. Seems bad cells seem more numerous lately. >>>> >>>> John Blittersdorf >>>> Rob Stubbins Solar >>>> >>>> >>>> On Wed, Apr 26, 2017 at 11:54 AM, Wallace Stahle <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> Hi Folks, >>>> >>>> I was called by a customer with the complaint of the MS4024 >>>> inverter shut down and ME-ARC controller and Trimetric acting >>>> strange, intermittent and even even showing 29 volts at times. >>>> >>>> The batteries are four 2.5 year old US battery L16XC 380 AH and >>>> checking each battery showed one at 4.8 v under charge while the >>>> other three were at 7+ volts and no current. >>>> >>>> Meanwhile the specific gravity was high on all cells and even a >>>> week after removal are up at 1.275 on all three cells. >>>> >>>> I suspect an open in the cell interconnects with enough >>>> continuity >>>> to read volts but not conduct current. >>>> >>>> My question is what have any of you seen n this regard and any >>>> knowledge of cause of such a failure. >>>> >>>> Your insights and experience are greatly appreciated. >>>> >>>> They were installed by others and are out of warranty. I donated >>>> a >>>> serviceable used USB L16 to get her back to a working system. >>>> She did recall her Ex stating along the lines of "oh this one has >>>> a problem but dont worry, it'll come around" as they were >>>> installed. >>>> >>>> Many thanks, >>>> >>>> Wallace Stahle >>>> Future Electric Energy Co >>>> P O Box 236 >>>> Willits, CA 95490 >>>> [email protected] <mailto:[email protected]> >>>> CA Lic.# C10-762093 >>>> 707-459-0474 <tel:707-459-0474> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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 >>>> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >>>> >>>> List-Archive: >>>> >>>> http://www.mail-archive.com/[email protected]/maillist.html >>>> >>>> <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] >>>> >>>> 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 >>> >>> >> >> Dave Angelini Offgrid Solar >> "we go where powerlines don't" >> http://members.sti.net/offgridsolar/ >> e-mail [email protected] >> text 209 813 0060 >> >> _______________________________________________ >> 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 >> > > Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail [email protected] text 209 813 0060 _______________________________________________ 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
