The easiest way to do so is to connect it to a 12, 24, or 48-volt system, charge them to full, and run a field load test at the C10 or C5 rate.
If the battery is 2300 ah, the C10 rate of discharge is going to be around 200 amps or so... depending on the manufacturer. You would charge the bank to what you think is full When current going into a 2300 ah bank is less than 2% for 60 mins the batteries aren't really accepting a charge. You then put the load current on the batteries by simply running uploads, you will need to measure the current and adjust loads throughout the test to stay as close to that 200 amps or so range. Note the start time so you can calc capacity at the end. While you are running loads you monitor voltages of each cell while under load every 30-60 mins. I check every 30 mins just in case there is a premature dropout or you know you have a very weak cell. When the cell voltage drops to 1.80 vpc you stop the clock and shut off all loads. The cell voltages should recover over the next 15-30 mins back to approx 2vpc. If you got 4 to 5 hours of time before hitting the 1.80vpc then the bank is full capacity. and you are good to go... If you only had about 2-3 hours of time, then the battery bank or dropping cells are failing and either cell replacement or total replacement should be considered. If you saw a cell or multiple cells collapse or the cell's voltages weren't within .2 to .3 volts you've got issues with those cells. Sometimes cycling 30-40% followed by full charges will help rectify this... Another way to do this is to buy a high rate linear load tester, the issue with these is cost and size, the smallest I've seen is the size of a mini-fridge, and they start out at about 25K and go up from there... Please do not use a starting battery load tester... It won't really give you very accurate results. Lead times are a whole other story... so much so that we've even made a web page on our website... https://rollsbattery.com/orders/ We update this every two weeks. The worst lead time is the most common battery we sell is the Series 4000, and 4500 Monoblock, starting about 18th months ago sales of these batteries have gone thru the roof due to extremely high demand. Now, these are for orders direct thru Surrette Battery, if you are ordering thru a distributor, they should have batteries in their Pipeline, this means lead times are based on their ordering/stocking levels. Hope this helps. <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 Wed, Jul 14, 2021 at 10:32 AM Dave Angelini Offgrid Solar < [email protected]> wrote: > I can ask my battery guy! He is the best with AGM and a dealer for full > river and concord. He does this alot! Saves a bunch. He always says that > most of the warranty is just a full/corrective charge and 80% are good. > Undercharging is the problem. Very very few are overcharged. His words! I > just replace the bank, no time to play with this stuff. > > However, I just do the same thing I do with any bank of individual > batteries. I put a large load on the bank with the inverter and look at > each cells voltage. You may have done this... > > The hard part is, depending on the make, is pulling the cell and doing a > full charge and EQ if it is the make that allows it. > > The other hard part is just getting batteries these days. I just heard > Trojan is 8+ months out. You know what Steve from RollsSurrette has said. 8 > weeks I think. > > The easy part, what make is your cell? > > > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail [email protected] <[email protected]> > text 209 813 0060* > > On Wed, 14 Jul 2021 10:16:31 -0700, Jeff Clearwater < > [email protected]> wrote: > > Hey Good Folks, > > I've got a 2300 AH AGM pack of 2 Volt cells that is showing signs of > premature aging (only 600 cycles) and I need to test the AH capacity of > each cell to help the customer make decisions going forward of whether to > replace individual lagging cells or the whole pack. > > What equipment have folks used to do AHour tests on 2 Volt 2300 AH cells? > I've done plenty of load testing on 6, 12, 24 and 48 volt packs as a whole > but am not sure what's my best approach is for 2 volt individual tests. > > I know I could put a resistance load and then use an AHour integrator > unit - but does anyone know of what unit and what resistive load I'd use at > 2 volts? That would be a large device at that voltage to get any > appreciative wattage! - I'd like to do a 10 hour test at most. > > I see 2 V test units on the web but they only appear to be hooked up for a > small amount of time - so they can't be testing full to empty discharge > AHours. > > Thanks! > > Jeff Clearwater > Village Power Design > www.villagepowerdesign.com > > _______________________________________________ > 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. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > 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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