Outback controllers have a tendency to be a bit slow. So they can definitely get higher than the set points but only for a second or two which is not going do damage anything. I’ve seen them do this.
Especially if it’s a larger array, sealed batteries and when the batteries are full and a load turns on and then off. At the load off the CC is dumping watts, and the sudden loss means a short voltage spike. Jay > On Jul 23, 2022, at 9:43 AM, Jerry Shafer via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > > Most AGM's don't like voltage that high and it swells the battery and > destroys its storage capability alot of the time > Jerry > >> On Fri, Jul 22, 2022, 7:50 PM Steve Higgins via RE-wrenches >> <re-wrenches@lists.re-wrenches.org> wrote: >> William, >> >> If the battery cases swelled, they saw over 52 degrees C temps for quite >> some time. >> >> While the swelling is usually only cosmetic, what's happening inside is the >> negative plates are starting to burn. This is where you will start to lose >> capacity and life cycle... Extended temps of just 35C will half the overall >> battery life. >> >> One of the issues with the Outback gear is they only temp compensate at >> 5mv/Degree/cell. For all the AGM batteries I know of, you need to temp >> compensate at 4mv. In hot temps, this should help, but cold temps could >> result in an overcharge. Did you check the BTS and make sure it was >> operating properly? >> >> Another issue is that BTSs are often placed on the top or lug of the >> battery, The top of the battery is about 5-10 deg C cooler than 1/2 way >> down the side of the battery, Which will also cause problems with proper >> temperature compensation, especially with warmer/colder extremes. >> >> Any kind of sulfation will cause an imbalance when you mix old and new >> batteries. I'm not a fan of mixing any age AGM batteries as there is no >> way to tell what the SOC of the old bank vs. the new bank is. They are not >> like flooded batteries; you can check SGs and dissipate heat much better >> than AGM or GEL batteries. I discourage doing this if you can. I >> probably wouldn't have mixed the old and new in the same strings. This way, >> you keep the higher resistance batteries in a single string, >> >> Lastly, bunching them together with no spacing between them is very bad. >> Batteries should be in a cool, dry environment. Most battery companies want >> to see 1-3 inches in between each battery to allow for effective cooling. >> When they are all bunched up together, that is a lot of thermal mass that >> doesn't have much chance of cooling. I have seen two parallel strings of >> AGMs take 24-36 hours with no charging or load to drop from 45c to 25C! >> >> Hope this helps! Have a good weekend. >> >> >> >> >> >> Steve Higgins ⋅ Technical Services Manager >> t +1.902.597.4020 m +1.206.790.5840 >> f +1.902.597.8447 e st...@surrette.com >> >> >> >> CONFIDENTIALITY: The information transmitted herein is intended only for the >> addressee and may contain confidential, proprietary and/or privileged >> material. Any unauthorized review, distribution or other use of or the >> taking of any action in reliance upon this information is prohibited. If you >> receive this email in error, please contact the sender and delete or destroy >> this message and all copies. >> >> >>> On Fri, Jul 22, 2022 at 6:48 PM William Miller via RE-wrenches >>> <re-wrenches@lists.re-wrenches.org> wrote: >>> Friends: >>> >>> >>> >>> I maintain a system with 16 AGM L-16 batteries. Eight were installed in >>> September of 2021 and 8 were added in March of 2022. This is 5 months >>> apart. I have understood that when you install a string of batteries you >>> have one year in which to add another string before the first string ages >>> to the point it is contraindicated. When I added the second 8 I put 4 new >>> batteries and 4 old batteries in each string. >>> >>> >>> >>> About a third of the batteries are discovered to bulging on top. I assume >>> this means the batteries are damaged. I checked the FXR and Outback >>> Extreme Charge controller settings and all were set to absorb at 58.8, and >>> float at 55.2, as the manufacturer recommends. >>> >>> >>> >>> I downloaded the charge controller log and got 129 days of data. In that >>> log I see 68 days where the batteries exceeded 60 VDC. This is over half >>> the days. >>> >>> >>> >>> I wonder this: >>> >>> >>> >>> 1. Why did the voltage go up above 58.8 on so many days even though it >>> was set at 58.8. (I set the EQ voltage at 58.8 just in case, but EQ was >>> never engaged.) >>> >>> 2. Did the excess voltage damage the batteries? >>> >>> Any input is appreciated. >>> >>> >>> >>> Sincerely, >>> >>> >>> >>> William Miller >>> >>> >>> >>> Miller Solar >>> >>> 17395 Oak Road, Atascadero, CA 93422 >>> >>> 805-438-5600 >>> >>> www.millersolar.com >>> >>> CA Lic. 773985 >>> >>> >>> >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> 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 >>> >>> There are two list archives for searching. When one doesn't work, try the >>> other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> 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 >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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