IT is actually a MIDTRONICS, designed to test the Siemens & record. Fluke 500 Series Battery Analyzer is another one.
I would call Bert Rohas @ 972-456-4626 TRS rentco. 730 central time. I have found this company great to deal with. I often use there power analyzers for problem clients & utilities. > On Jul 14, 2021, at 5:49 PM, Tump <t...@swnl.net> wrote:at > > I do have a Megatron battery tester that does test internal resistance whit > voltage present. The battery Manu usually has that information. When I get > my Unigy II battery banks they supply the sheet w/ those #. Did you say what > the battery charge settings were? Not much use at this point as it is tough > to clean up AGM cells. >> On Jul 14, 2021, at 5:43 PM, Jeff Clearwater <je...@villagepowerdesign.com >> <mailto:je...@villagepowerdesign.com>> wrote: >> >> Yes good thought Chris -I doubt if there is an IR tester anywhere on the >> island - but when I go I will for sure look at that - thanks for that. >> >> How would one measure battery resistance with voltage present? I guess with >> a known voltage applied and current held constant one could calculate? but >> then how do you know you are measuring resistance vs storing energy? I >> don't think that's possible - others? >> >> jc >> >>> Chris Worcester <mailto:ch...@solarwindworks.com> July 14, 2021 at 2:14 PM >>> Has an infra-red thermometer been used on every battery's terminals to >>> check for resistance? I recall, although this might be my own thoughts, >>> that internal resistance of each cell can be measured with an ohm meter... >>> >>> >>> >>> Chris Worcester >>> ch...@solarwindworks.com <mailto:ch...@solarwindworks.com> >>> 530-448-9692 >>> >>> Sent from my Samsung Galaxy s9. >>> >>> >>> -------- Original message -------- >>> From: Jeff Clearwater <je...@villagepowerdesign.com> >>> <mailto:je...@villagepowerdesign.com> >>> Date: 7/14/21 1:42 PM (GMT-08:00) >>> To: RE-wrenches <re-wrenches@lists.re-wrenches.org> >>> <mailto:re-wrenches@lists.re-wrenches.org> >>> Subject: Re: [RE-wrenches] How Best to Load Test 2 V Cells >>> >>> Hey Jay, >>> >>> Yes the Sunny island Master of this Quad SI AC-coupled off-grid system has >>> been giving automatic Eq and Full charge charges perodically as appropriate >>> to this 48 V EnergyCell RE2700 pack. >>> >>> We are getting whole pack volt drops way before we should at 600 well- >>> maintained cycles. When we do whole pack testing - when the voltage drops >>> off there are 5 of the 24 cells lagging - their voltage drops faster than >>> the rest - but they operate well between 50%-100% - all busbars have been >>> triple checked for corrosion and tourque. >>> >>> So it looks like they just aged prematurely - so I'm in the process of >>> collating data from EnnexOS to get exact numbers on how they've been >>> treated. But even with a few hard cycles they should held up better than >>> they have. So perhaps a warranty claim - I've gone through charge settings >>> with SMA etc. I did have the AHrs programmed slightly below rated AHrs due >>> to confusion of whether the SI uses the 20 hr or 10 hr rate (in Europe they >>> use 10 but apparently - unbeknowst to me - the US SI uses the 20 Hr - I >>> swear SMA tech support years ago told me 10 hours) but now they are >>> claiming that might be the culprit - I have a hard time believing that >>> setting the Ahour rating in the SI to 2100 instead of 2288 as rated would >>> lead to pack failure - but they are claiming that could have contributed. >>> >>> Thoughts? >>> >>> Best, >>> >>> Jeff >>> >>> >>> >>> >>> Jeff Clearwater <mailto:je...@villagepowerdesign.com> July 14, 2021 at 1:42 >>> PM >>> Hey Jay, >>> >>> Yes the Sunny island Master of this Quad SI AC-coupled off-grid system has >>> been giving automatic Eq and Full charge charges perodically as appropriate >>> to this 48 V EnergyCell RE2700 pack. >>> >>> We are getting whole pack volt drops way before we should at 600 well- >>> maintained cycles. When we do whole pack testing - when the voltage drops >>> off there are 5 of the 24 cells lagging - their voltage drops faster than >>> the rest - but they operate well between 50%-100% - all busbars have been >>> triple checked for corrosion and tourque. >>> >>> So it looks like they just aged prematurely - so I'm in the process of >>> collating data from EnnexOS to get exact numbers on how they've been >>> treated. But even with a few hard cycles they should held up better than >>> they have. So perhaps a warranty claim - I've gone through charge settings >>> with SMA etc. I did have the AHrs programmed slightly below rated AHrs due >>> to confusion of whether the SI uses the 20 hr or 10 hr rate (in Europe they >>> use 10 but apparently - unbeknowst to me - the US SI uses the 20 Hr - I >>> swear SMA tech support years ago told me 10 hours) but now they are >>> claiming that might be the culprit - I have a hard time believing that >>> setting the Ahour rating in the SI to 2100 instead of 2288 as rated would >>> lead to pack failure - but they are claiming that could have contributed. >>> >>> Thoughts? >>> >>> Best, >>> >>> Jeff >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> <http://re-wrenches.org/> >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> <mailto:RE-wrenches@lists.re-wrenches.org> >>> >>> 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> >>> >>> 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/ >>> <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> <http://www.re-wrenches.org/etiquette.htm> >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >>> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> <http://re-wrenches.org/> >> >> List Address: RE-wrenches@lists.re-wrenches.org >> <mailto:RE-wrenches@lists.re-wrenches.org> >> >> 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> >> >> 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/ >> <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 >> > > > >> Tump >> <blocked::mailto:t...@swnl.net%22%20%5Co%20%22blocked::mailto:t...@swnl.net>3...@gmail.com >> <mailto:3...@gmail.com> www.SWNL.net >> <blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://www.swnl.net/> >> Solarwinds Northernlights >> Serving Mid Coast Maine & Northern California >> 207-832-7574 Cl. 610-517-8401 >> >> Blair "TUMP" May >> ******** MAINE'S CHARTER ******** >> NABCEP "Certified PV Installer" >> >> ******** MAINE'S CHARTER ******** >> Trace Xantrex "Certified" Dealer / Installer" >> > > > > Tump > <blocked::mailto:t...@swnl.net%22%20%5Co%20%22blocked::mailto:t...@swnl.net>3...@gmail.com > www.SWNL.net > <blocked::http://www.swnl.net/%22%20%5Co%20%22blocked::http://www.swnl.net/> > Solarwinds Northernlights > Serving Mid Coast Maine & Northern California > 207-832-7574 Cl. 610-517-8401 > > Blair "TUMP" May > ******** MAINE'S CHARTER ******** > NABCEP "Certified PV Installer" > > ******** MAINE'S CHARTER ******** > Trace Xantrex "Certified" Dealer / Installer" >
_______________________________________________ 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
