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APC UPS 750 ES

APC UPS for Home and Office Forum

Support forum to share knowledge about installation and configuration of APC offers including Home Office UPS, Surge Protectors, UTS, software and services.

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jdawson_apc
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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

APC UPS 750 ES

This was originally posted on APC forums on 3/29/2017


I bought a new APC brand battery for my 750 ES that I have been having issues with a and it looks like it maybe working better now.

I am still in the testing phase and I connected a lamp with a 60W incandescent bulb to it.  When I turn it on it says it only has a 22 watt load.

Is there a way to fix this to re-calibrate the load on the UPS because it is obviously wrong.

I plugged in other items that I know the load of and it is always way under on the true load.

Joe

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jdawson_apc
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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This was originally posted on APC forums on 4/3/2017


I am getting the 85 v on plug. When on battery. Plus lights are dim when on battery. Lights go bright and I get 115v when I go back and plug in ups.  

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BillP
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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This reply was originally posted by Secret on APC forums on 4/3/2017


Hi Joe,

The Back-UPS ES 750G / BE750G is a Stand-By UPS. Being that it's Stand-by it can not truly provide accurate load capacity, unless it is operating off the inverter. The load provided while online is only approximate. To see the true load, the UPS should be forced to battery.

Now that being said, depending upon the age of the incandescent light bulb your using you may discover it's not drawing the full specified watt rating. As these bulbs age, the filament is depleted through continuous use resulting in diminished current draw and overall luminance.

Secret Squirrel

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jdawson_apc
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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This was originally posted on APC forums on 4/3/2017


Thanks.

Looks like the investor had failed. On battery I am only getting 85v. 

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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This reply was originally posted by Secret on APC forums on 4/3/2017


That may be due to the type of voltmeter you are using.

The UPS produces a step approximated sine wave which can not be accurately measured by a standard voltmeter. These inexpensive meters are often refereed to as Non-True RMS voltmeters which are widely available at any local hardware / automotive store. These meters are only capable of averaging their reading.

When measuring a Pure Sine wave, the True RMS and Non-True RMS meters will give the correct AC reading, however when measuring any waveform other than the Pure Sine wave, the Non-True RMA meter provide a voltage reading much lower than what is present. In some cases it could be as low as 40%.

A True RMS meter will actually have this printed somewhere on the enclosure, unlike a Non-True RMS.

True RMS Volt MeterNon-True RMS

Secret Squirrel

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jdawson_apc
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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This was originally posted on APC forums on 4/3/2017


I used a fluke true one. 

I also thought it was wrong when the 60w bulb from an incandescent light I had plugged in for a test load was dim when running off battery but bright when I plugged the ups back in. 

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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This reply was originally posted by Secret on APC forums on 4/3/2017


Are you measuring between Neutral and Hot while on battery?

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jdawson_apc
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Posted: ‎2021-06-28 05:49 AM

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Posted: ‎2021-06-28 05:49 AM

This was originally posted on APC forums on 4/3/2017


I am getting the 85 v on plug. When on battery. Plus lights are dim when on battery. Lights go bright and I get 115v when I go back and plug in ups.  

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