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# How can you calculate your House's Power Factor?

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#### Zanderist

##### Member level 3
How can you do this?

Zanderist

### Zanderist

Points: 2
Your power factor changes depending on what is turned on. You can buy a power factor/watt meter or you can build something to measure it.

I use a closed loop hall effect current sensor with about 300 kHz frequency response which also allows meet to capture startup up current waveforms from by central air conditioner compressor. You have to capture the vector current and voltage to muliply the two together to get true power and apparent power numbers.

A residential service pays for true power not apparent power so correcting PF does little for your electric bill. You only save on small additional wiring losses due to higher current as result of poor power factor.

Zanderist

Points: 2
Zanderist

### Zanderist

Points: 2
Are you suggesting that these formulas are similar to that of Power Factor?

regardless this looks useful.

What is power factor.........................

http://www1.eere.energy.gov/industry/bestpractices/pdfs/mc60405.pdf

It is not so simple.............................

TOPOLOGICAL ISSUES IN SINGLE-PHASE POWER FACTOR CORRECTION
http://lib.tkk.fi/Diss/2001/isbn9512257351/isbn9512257351.pdf

How to measure................................

AC Power Theory 1 | OpenEnergyMonitor

AC Power Theory 2 | OpenEnergyMonitor

http://www.atmel.com/dyn/resources/prod_documents/doc2566.pdf

Power factor - Wikipedia, the free encyclopedia

From another side..............................................

Power Factor Correction Scam Review
KVAR Power Factor Correction in the Home is a Scam

Regards KAK

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