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Analyzing Power Consumption

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

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mechanyx_apc
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Analyzing Power Consumption

This was originally posted on APC forums on 5/1/2009


I have 4 APC 6000RT's in various offices. Is there a way to extrapolate a good baseline on power consumption from the data presented on the Status page? Management wants to know what the load is in Watts/VA and the system reports the Load Power in %Watts and %VA - not sure what this means.

Any clarification?

Thanks in advance.


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BillP
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Re: Analyzing Power Consumption

This reply was originally posted by Angela on APC forums on 5/4/2009


i am not sure what you are doing exactly haha..

here is what i did if you just want to find out how much load the UPS is drawing in watts or VA:

VA: 3.68A * 208v = 766.44VA (12% of 6000VA = ~720VA so this is pretty close)

Watts: 14% * 4200 watts = 588 watts

also, input power factor is .95 and output power factor is .7

See Answer In Context

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BillP
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Re: Analyzing Power Consumption

This reply was originally posted by Angela on APC forums on 5/1/2009


well, the SURT6000XLT maxes out at 4200 Watts / 6000 VA. if you have the percentages of what is in the status page/data log on the network management card, you can figure out what load is being drawn. dont forget to factor in whether you are using 208v or 240v when calculating volt amps.

hope this helps or let me know if i can provide any more information.

mechanyx_apc
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Re: Analyzing Power Consumption

This was originally posted on APC forums on 5/1/2009


That does because I think I've been taking the long way around with calculating this.

This is currently what is being reported from one of them:

Power
Input Voltage: 204.4 VAC
Bypass Input Voltage:
Output Voltage: 209.4 VAC
Current:
Input Frequency: 60.01 Hz
Load
Load Power: 14.0 %Watts
Apparent Load Power: 12.0 %VA
Load Current: 3.68 Amps
Battery
Capacity: 100.0 %
Battery Voltage: 218.1 VDC
External Batteries: 2


My calculations:

Load power on output of UPS = 6.08A * 207.0 Vac = 1259 VA
UPS output power capability = 4200 W
The present load at (1259 VA / 4200 W ) *100% = 30% capacity of the UPS (quite low, so probably the effic is at ~ 70%, estimate )
Assuming UPS efficiency (Output PWR / Input PWR) = 70%
Load power from the wall (input of UPS) = 1259 VA / 0.7 = 1799 VA
Load current from the wall (input of UPS) = 1799 VA / 216V ac = 8.3A ac

Thoughts?


Edit: My calculations don't match what's being reported above. But the gist should be the same.

Message was edited by: mechanyx

BillP
Administrator Administrator
Administrator
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145

Re: Analyzing Power Consumption

This reply was originally posted by Angela on APC forums on 5/4/2009


i am not sure what you are doing exactly haha..

here is what i did if you just want to find out how much load the UPS is drawing in watts or VA:

VA: 3.68A * 208v = 766.44VA (12% of 6000VA = ~720VA so this is pretty close)

Watts: 14% * 4200 watts = 588 watts

also, input power factor is .95 and output power factor is .7