Jeremy, If they dropped and the voltage stayed within .2 to .4 of each other over this time, they are at or very close to the end of life, they need to be replaced. The fact that they dropped so fast indicates the end of life for those batteries.
Positive post-growth is caused by two things. High temperatures, and over current while charging. Most FLA's don't like to be charged at over 20% of the C/20 rate. So assuming a 400 ah battery @ C/20 charging currents over 80 amps will increase temperatures so much that you will see the positive post rising out of the battery. It can happen to both, but it's more prevalent with the positive posts. Sorry Jeremy, but this battery bank has seen its best days... I don't think the customer has much time with these left, they definitely won't make it thru another fall/winter with these. If you are going to stick with FLA I would get the replacements in before fall as you want a couple of months of decent sun/cycling to fully form the next bank before winter. <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> <http://www.rollsbattery.com> Steve Higgins ⋅ Technical Services Manager t +1.902.597.4020 m +1.206.790.5840 f +1.902.597.8447 e [email protected] <#SignatureSanitizer_SafeHtmlFilter_> <http://www.facebook.com/RollsBattery> <http://www.facebook.com/RollsBattery> <http://www.twitter.com/RollsBattery> <https://www.youtube.com/user/RollsBattery> <https://www.linkedin.com/company/rolls-battery-engineering> <http://www.instagram.com/RollsBattery> <http://www.instagram.com/RollsBattery> <http://www.instagram.com/RollsBattery> ------------------------------ 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 Sat, Jul 24, 2021 at 6:12 AM Jeremy Rodriguez <[email protected]> wrote: > I Isolated the two strings and load tested. I ran about 1500 watts for > 10-12 min while monitoring the voltages. > I saw them drop from 6v to 5.5, 5.3 the lowest, over that time. I didn’t > have a lot of time to test, but none dropped drastically. Checked both > strings. > The electrolyte was clear when I checked cells. 1.265- 1.275 > No residue on the caps > I did note that all the positive Posts have “grown” and cause the case to > start cracking slightly around the post. > I’ve seen this a lot with Deka. > > > > Jeremy Rodriguez > Solar Installation / Design Expert > All Solar, Inc. > 1453 M St > Penrose Colorado 81240 > > Sent by Jeremy's iPhone. Sorry for typos and shorthand. > > On Jul 21, 2021, at 8:59 AM, Steve Higgins <[email protected]> wrote: > > > Jeremy... > > A single string of 6v L16 @ 48 volts you will want to run about 30-40 amps > of discharge current... This with losses is about 1500 to 1800 watts. > > Make sure the battery is charged, > > Run the loads > > Measure the Batteries... my bet is since you are getting a LBCO drop out > the battery in question will fall off quickly > > > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > <http://www.rollsbattery.com> <http://www.rollsbattery.com> > Steve Higgins ⋅ Technical Services Manager > t +1.902.597.4020 m +1.206.790.5840 > f +1.902.597.8447 e [email protected] > <#m_-7174697394681466163_SignatureSanitizer_SafeHtmlFilter_> > <http://www.facebook.com/RollsBattery> > <http://www.facebook.com/RollsBattery> > <http://www.twitter.com/RollsBattery> > <https://www.youtube.com/user/RollsBattery> > <https://www.linkedin.com/company/rolls-battery-engineering> > <http://www.instagram.com/RollsBattery> > <http://www.instagram.com/RollsBattery> > <http://www.instagram.com/RollsBattery> > > ------------------------------ > 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 Wed, Jul 21, 2021 at 7:54 AM Jeremy Rodriguez <[email protected]> > wrote: > >> Okay >> Is there a quick way to run on just one string? Or should I say determine >> which batteries would make a good string. >> I’d normally say, find the best batteries based on specific gravity and >> use them, but in this case all specific gravity‘s seem good. >> >> >> Jeremy Rodriguez >> Solar Installation / Design Expert >> All Solar, Inc. >> 1453 M St >> Penrose Colorado 81240 >> >> Sent by Jeremy's iPhone. Sorry for typos and shorthand. >> >> On Jul 21, 2021, at 8:44 AM, Steve Higgins <[email protected]> wrote: >> >> >> FLA batteries cells fail generally in two manners. >> >> Open Cell and Shorted. >> >> Open Cells are more resistive and "Eat up" charging voltage which denies >> voltage and charging potential to the rest of the bank so the entire bank >> sags. This is the most common type of failure. >> >> Shorted Cells are less resistive so they allow voltage and current to >> pass on to the rest of the cells in the string. This causes an overcharge >> condition because the dead cell isn't dropping any voltage and the rest of >> the cells in the string become "overcharged". >> >> Sometimes SG's will look good, but when the bank is under load you will >> see the voltage drop off quickly. This is often the shorted cell. >> >> Battery SG's are like Goldilocks and the three bears.. There is too >> high... Too low and Just right... Too low and you lose capacity and this >> causes sulfation, which will cause overheating, excessive water use, and >> will lead to failure. This is the most common way an FLA battery bank >> dies is low SG's are not corrected soon enough and the bank sulfates. >> >> Too high, and you'll get great capacity, for a while, but that higher >> acidity will cause corrosion on the plates which will act a lot like >> sulfation. On these, you will often see a darker electrolyte as the >> higher acidity/corrosion is eating away at the active material of the >> plates. >> >> To figure this out what you need to do is... >> >> 1. Charge the bank to what you think is full or close to it.. >> 2. Find the 10 Hour Discharge Rate of the bank. (C/10 Discharge Current) >> 3 Apply load as close as you can get it by running loads in the house. >> You will be running this test for 2-5 hours depending on test results. >> 4. Monitor battery voltages during this test every 30-60 mins. >> >> individual battery voltages should stay pretty close to each other as >> they discharge, If you start to see one or two batteries sag in voltage >> before the rest you have weak or dying cells. >> My bet is you have 1 or two cells that have failed and this is the reason >> for the LBCO... >> >> >> >> >> >> >> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> <http://www.rollsbattery.com> <http://www.rollsbattery.com> >> Steve Higgins ⋅ Technical Services Manager >> t +1.902.597.4020 m +1.206.790.5840 >> f +1.902.597.8447 e [email protected] >> >> <#m_-7174697394681466163_m_-602769012660050662_SignatureSanitizer_SafeHtmlFilter_> >> <http://www.facebook.com/RollsBattery> >> <http://www.facebook.com/RollsBattery> >> <http://www.twitter.com/RollsBattery> >> <https://www.youtube.com/user/RollsBattery> >> <https://www.linkedin.com/company/rolls-battery-engineering> >> <http://www.instagram.com/RollsBattery> >> <http://www.instagram.com/RollsBattery> >> <http://www.instagram.com/RollsBattery> >> >> ------------------------------ >> 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 Wed, Jul 21, 2021 at 7:24 AM Jay <[email protected]> wrote: >> >>> And what color is the electrolyte? >>> >>> On Jul 21, 2021, at 8:02 AM, Jay <[email protected]> wrote: >>> >>> >>> Hi Jeremy >>> >>> I would like to know brand and model of battery first. >>> >>> Jay >>> Peltz power >>> >>> On Jul 21, 2021, at 7:22 AM, Jeremy Rodriguez <[email protected]> >>> wrote: >>> >>> What’s going on with a battery bank that reads 1.275 SG on all the >>> batteries but one, which has cell readings slightly higher. >>> The bank is probably 7 years old and this is not a full time residence. >>> It’s shutting down with LBCO error. >>> I need to go check the site, but I’d expect a dead or weak cell here. >>> What else can be checked , battery wise? >>> >>> >>> >>> Jeremy Rodriguez >>> Solar Installation / Design Expert >>> All Solar, Inc. >>> 1453 M St >>> Penrose Colorado 81240 >>> >>> Sent by Jeremy's iPhone. Sorry for typos and shorthand. >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> List Address: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. 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