Feb 22 2016, 06:50 PM
QUOTE(Christopher_LKL @ Jan 29 2016, 10:29 AM)
Hi all sifus like goldfries,
I have some confusion on power efficiency and power factor.
for the sake of example, if my PC is drawing 500Watts constantly, lets say my PSU is 80% efficiency, i will draw 600watts from AC then convert it into 500watts DC right. then if lets say my PSU power factor is only 0.5, then i will draw 1200 apparent power (in form of VA) from mains, though i will be only using 600watts as work done.
so in TNB point of view, TNB only charges for watts or work done, therefore only charge me the 600watts, and since residential rate doesnt have Power Factor surcharge, im done with that. but if im on commercial, the charging will be 600 watts + 3% surcharge (according to TNB, less than 0.85 PF will get 3% surcharge).
and in short, Power Efficiency is used for DC, while Power Factor is used for AC to gauge the efficiency
am i correct?
Thanks
Power efficiency is simply a measure of a real power in vs real power out.I have some confusion on power efficiency and power factor.
for the sake of example, if my PC is drawing 500Watts constantly, lets say my PSU is 80% efficiency, i will draw 600watts from AC then convert it into 500watts DC right. then if lets say my PSU power factor is only 0.5, then i will draw 1200 apparent power (in form of VA) from mains, though i will be only using 600watts as work done.
so in TNB point of view, TNB only charges for watts or work done, therefore only charge me the 600watts, and since residential rate doesnt have Power Factor surcharge, im done with that. but if im on commercial, the charging will be 600 watts + 3% surcharge (according to TNB, less than 0.85 PF will get 3% surcharge).
and in short, Power Efficiency is used for DC, while Power Factor is used for AC to gauge the efficiency
am i correct?
Thanks
Power factor isn't a draw of any real power, apparent power isn't a load, it is the constraint on the supply side that your load has brought.
1200 VA apparent load is where you load looks as though it were drawing 1200 real watts from the utility. It's like driving a car with a fat chick, you consume a lot more fuel and you make the car work harder, but the real amount of KM driven and people transported is the same vs you driving with a slim girl.
This post has been edited by empire23: Feb 22 2016, 06:51 PM
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