But my core charge... The ones that are possibly good are still 6 years old and I don't have any interest in deploying something that old.
Josh Luthman 24/7 Help Desk: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Tue, Dec 29, 2020 at 4:56 PM Chuck McCown <[email protected]> wrote: > It will take 5 minutes to finger the bad one. At least if you are going > to change them all, don’t toss the good ones. Just kill the power and take > voltage readings. The good ones will all read similar. Bad ones drop > quickly. > > *From:* Josh Luthman > *Sent:* Tuesday, December 29, 2020 2:03 PM > *To:* AnimalFarm Microwave Users Group > *Cc:* Chuck McCown > *Subject:* Re: [AFMUG] Custom batteries on APC Smart UPS 750XL > > Well I'm just going to replace all 4 of them then (12v batteries wired for > 24v). No sense in trying to figure out which one is bad IMO - $300 and a > wrench I'll be done in an hour. > > Thanks for the sanity check! > > Josh Luthman > 24/7 Help Desk: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > On Tue, Dec 29, 2020 at 3:53 PM Chuck McCown via AF <[email protected]> > wrote: > >> Yes, best to periodically discharge it and take volts per cell or volts >> per battery every few minutes. The bad cell/battery will start to make >> itself evident very quickly. I have a charger setup that does this for me >> automatically. >> >> *From:* Josh Luthman >> *Sent:* Tuesday, December 29, 2020 1:48 PM >> *To:* AFMUG >> *Subject:* [AFMUG] Custom batteries on APC Smart UPS 750XL >> >> These batteries: https://www.batteriesplus.com/productdetails/97=479=1 >> >> I first installed this system just under 6 years ago. We've lost power a >> couple of times, but only for a short while (30-45 minutes). I remember it >> saying something stupid like 7 hours of run time. I have no idea how APC >> calculates this. >> >> Today we had another outage, where a phase went out, and it switched over >> to batteries again. It said something like 30 minutes of run time! >> Luckily I ran upstairs and after 10-15 minutes, it was really pissed that >> it didn't have power and angrily beeped that it was nearly ready to give up >> (at which point I put it on the generator). >> >> After a few hours we got utility back up and I moved the UPS back over. >> After lunch I wanted to test the battery voltages, but in the 5 seconds it >> was unplugged it got really pissed again so I plugged it back in. >> >> With the charger on it, each battery individually is showing me 13.83v. >> >> In the first 10 minutes of the day without power, battery voltage went >> from 27.6 down to 22.36. This confirms I have at least one bad battery, >> right? The load is roughly ~83 watts according to the UPS. >> >> Josh Luthman >> 24/7 Help Desk: 937-552-2340 >> Direct: 937-552-2343 >> 1100 Wayne St >> Suite 1337 >> Troy, OH 45373 >> ------------------------------ >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >
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