VA and Watt

The ups write 600 VA how can I convert to Watt
teeraAsked:
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ridConnect With a Mentor Commented:
Power in AC circuits is V times A times the cosine of the phase shift. Thus you can have an appliance that takes several amps at 230v, but if a phase shift is introduced, (e.g. motors) the real power will perhaps be very low. Still, from the viewpoint of the power supply, it still has to deliver a certain amount of current into the load. Using VA is then a much better way of describing the limits of the power supply (or the drain of the appliance) W is useful only for DC or pure resistive loads, like lightbulbs or heaters, in AC circuits.

/RID
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CallandorConnect With a Mentor Commented:
Multiply the VA by 0.625 and you should have the watt rating.  See http://www.apcc.com/products/runtime_for_extendedruntime.cfm?upsfamily=21
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tmj883Connect With a Mentor Commented:
When measuring DC, the Watt and the Volt Ampere are equivalent. When measuring AC, the Volt Ampere is a measure of the apparent power and works as Callandor states above approximately.
T
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publicConnect With a Mentor Commented:
>Power in AC circuits is V times A times the cosine of the phase shift.
This does not really apply to UPS's when the load is a power supply, since the current is not a sine wave.
There is no universal conversion. Depending on the type of load, you can estimate the needed rating.
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