>Also, that’s a lot more amp hours than the internal batteries, so even with an XL, I would expect it to take a long time to recharge the batteries after an outage.
Sure, it takes a good hour or few. Once power comes back I don't care. I just want my multi hour run time back! 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 5:09 PM Ken Hohhof <[email protected]> wrote: > 6 years is beyond what I’d expect for battery life on that system. I > would probably replace them every 3 years even if they never get discharged. > > > > Also, that’s a lot more amp hours than the internal batteries, so even > with an XL, I would expect it to take a long time to recharge the batteries > after an outage. > > > > > > *From:* AF <[email protected]> *On Behalf Of *Josh Luthman > *Sent:* Tuesday, December 29, 2020 3:04 PM > *To:* AnimalFarm Microwave Users Group <[email protected]> > *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 > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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