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Weird charging behavior on new SMT1500C

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MysteryGuy_apc
Ensign MysteryGuy_apc
Ensign

Posted: ‎2022-02-17 07:49 AM

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Posted: ‎2022-02-17 07:49 AM

Weird charging behavior on new SMT1500C

Hi;

 

I just got a brand new SMT1500C and it seems to be showing some strange behavior.

 

I already had an SMT1500 and the charging behavior of the SMT1500C seems very different (and seemingly wrong).

 

I wanted to know if this is how the SMT1500C's are supposed to behave or if I might have a defective one.

 

I installed PCBE 10.0.5 on Windows 10. I'm using the USB cable connection  to monitor the UPS status.

 

When I first started up the SMT1500C it reported a charge of about 8x% and voltage of 27.3 V.

 

After about 70 minutes it reported 96% charge/ 27.3 V. (This is with a light load of about 15%).

 

But progress crawled after that and it took about 22 more hours for the charge to finally report 100%. It slowly added 0.1% at a time maybe every 30-60 minutes.

 

After reaching 100% the reported battery voltage dropped from 27.2V to around 26.7 volts over the course of about 20-30 minutes.

 

I decided to initiate a 'self-test' at that point which seemed to work. The reported charge/voltage dropped to about 98.8 % charged / 27.2 V.

 

15 hours or so later it finally reports 100% charge again (making slow 0.1% increments along the way like before).

 

The reported battery voltage has dropped to 26.7V over the course of about 50 minutes since reaching 100%.

 

On my old SMT1500,

 

1) It never takes that long after a self test to reach 100% charge.  I think the last

    runtime calibration (with a much longer drain time) reported return to 100% within 2-3

    hours.

 

2) I don't think I've ever seen my SMT1500 report a voltage lower than about 27.2V

    after reaching 100% charge.

 

    Is it right for the battery voltage to drop on the SMT1500C after reaching 100%

    charge?

 

It seems to me that something is wrong if it takes so very long to report 100% charge after even a self-test.

 

Thanks;

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MysteryGuy_apc
Ensign MysteryGuy_apc
Ensign

Posted: ‎2022-02-20 09:59 AM . Last Modified: ‎2022-02-20 10:20 AM

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Posted: ‎2022-02-20 09:59 AM . Last Modified: ‎2022-02-20 10:20 AM

I was hoping someone who has an SMT1500C could at least relate how their device compares for recovery from Self-test, and battery voltage at 100% charge.

 

At any rate, I've returned my new UPS since it unexpectedly dropped it's load output twice. 

 

Once momentarily when sliding the battery back in after I examined it (to see if it showed any obvious issues).

 

Then later half-way through recharging after a run-time calibration when I tried to move the unit back a few  inches.

 

So my unit apparently had something very wrong with it.

 

My system is  back on an old SU1400BX120 (from Jan. 2000) I was planning on replacing (purely because of age). Now things are once again normal.

 

It may be a while before I get a replacement, so I will have to see how the SMT1500C  charging behavior is then (compared to an SMT1500).

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