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#51
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![]() If the current and voltage are in phase, the motor speed is the product of voltage and current (PF=1). If they are not in phase the motor in the meter will run fast for part of a cycle and slower for the other part with the average speed being the product of the in-phase voltage and current. Thus measuring real power.
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#52
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![]() According the producers of the energy monitor:
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#53
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob ![]() |
#54
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![]() Yap that's right. Like I said in the very beginning, the utility companies either consider pf=1 or maybe they just do some calculations to find a relative pf for the houses to multiply the RMS volt and current. The meter's simply can't find the individual PF of each appliances. Alongside, households doesn't generally have heavy PF lowering stuffs and hence its more or less above 0.9. Two or three pumps may have low PF in your house but in the end, it won't effect much to the pf of your whole house.
I have sent an email to enmax regarding this. The theory and the claims are just not going through and would love to clear it up too. ![]() Another thing, if possible, if to measure the resistance of the motor (disconnect it and then measure) and then putting in the current (1.85) and resistance into the formula: I^2/R.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob ![]() Last edited by mrhasan; 03-07-2013 at 07:26 PM. |
#55
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![]() Well my understanding of AC power isn't great, not my specialty by a long shot. However it seems obvious to me that the term reactive power (the difference between apparent and real) when referred to "imaginary power" isn't something you're going to billed for. It's not being used despite the fact it goes through the circuit. While I might find it amusing to see a line on my power bill that said "Imaginary power usage = 958 kWh (this is the power you didn't use)" I just can't see it.
It's why everything online states a utility meter that measures in kW measures real power and not apparent power. It's clear power factors have virtually zero impact on your power bill which is why all those power factor compensation devices are a scam, also well documented. I've also sent an inquiry to Enmax and GE (meter manufacturer) for conformation. |
#56
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![]() Alright Steve you don't have to break the motor. I came across an energystar article and they say that in NA grid system, if you have a low pf equipment in domestic facility, you draw in more current but you are only charged for the amount of power that you are consuming and the extra power due to the charge is actually put into the penalty of the industries who have to pay for pf corrections.
So I guess you are actually getting charged for 82W :P Sorry for the confusions; sometimes theory and practical stuffs doesn't match ![]()
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob ![]() |
#57
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![]() Quote:
World should revert back to DC grids like Edison's time. AC stuffs are just too complicated ![]()
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob ![]() |
#58
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#59
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#60
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__________________
You wouldn't want to see my tank. I don't use fancy equipment and I am a noob ![]() |
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