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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