VA, Watts, external cabinets

[Anonymous user]

I have many different models of APC, some with external cabinets, and others without.

1. Does an exteranl cabinet affect the units overall VA capacity rating?

2. Comparing the values in the units web interface, it shows volts used, amps used and percentage of rated capacity. If I multiply volts x amps and divide that number by the VA percentage being used by the unit, I get a number somewhere near the rated capacity, sometimes higher, sometimes lower, bet usually within 200 of the rated capacity. Is this the difference between VA and Watts, and would this mean that the VA rating on the unit is an estimation?

3. What is more useful to know, the VA rating on the box or the calculated VA (Volts In Use x Amps In Use) / Percentage Capacity In Use?

I am creating a monitoring system for my NOC that charts over time what VA is being used and what the capacity of the room is. Just not sure what I should be using as the capcity of the room....the rating on the box or the calculated rating based on the information being returned by the web interface.

Thanks

[TheNotoriousKMP_apc]

The Input Power Factor has changed on some of the newer UPS sytems, specifically with 3.5G Smart-UPS (SUA), and the Symmetra LX. However, you may want to take a look at the Network Management Card and its data logging capabilities to resolve this. Depending on the UPS, there are options to log a %kVA out, and a %W out.

[Anonymous user · Accepted solution]

I have many different models of APC, some with external cabinets, and others without.

1. Does an exteranl cabinet affect the units overall VA capacity rating?

2. Comparing the values in the units web interface, it shows volts used, amps used and percentage of rated capacity. If I multiply volts x amps and divide that number by the VA percentage being used by the unit, I get a number somewhere near the rated capacity, sometimes higher, sometimes lower, bet usually within 200 of the rated capacity. Is this the difference between VA and Watts, and would this mean that the VA rating on the unit is an estimation?

3. What is more useful to know, the VA rating on the box or the calculated VA (Volts In Use x Amps In Use) / Percentage Capacity In Use?

I am creating a monitoring system for my NOC that charts over time what VA is being used and what the capacity of the room is. Just not sure what I should be using as the capcity of the room....the rating on the box or the calculated rating based on the information being returned by the web interface.

Thanks