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# How to measure household electric consumption?

#1
08-27-07, 10:14 AM
Member
Join Date: Aug 2007
Posts: 5
How to measure household electric consumption?

Anyone has an idea on how to measure household electric consumption?
I want to optimize the usage v/s the life style.

I see some device online worth \$200..300 that can be fitted inline the electric supply..

Is there anything cheaper?

Last edited by DIYaddict; 08-27-07 at 10:26 AM. Reason: Thread moved from Applicance-Electric
#2
08-27-07, 10:31 AM
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Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
The meter that the electric company has installed at your residence works just fine. Read it every day or however often you want and it will tell you your power consumption.

#3
08-27-07, 12:03 PM
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Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,342
The Kill-A-Watt meter is helpful for testing the consumption of some types of individual appliances. It's fairly cheap at around \$25, but the downside is that is can only measure energy usage for cord-and-plug 120V appliances which consume 15A or less.

#4
08-27-07, 12:40 PM
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Join Date: Feb 2002
Location: port chester n y
Posts: 2,117
Take 2 "readings" of your KWHR meter with an exact 48 hour interval between the 2 readings,

Subtract the lower ( 1st) reading from the higher ( 2nd reading)

Divide the difference by 48 (hrs) , = xKW's

Multiply the KW value X 1000 --- 6.6 Kw's = 6600 watts

Divide the Watt value by 220(volts)----- 6600/220 = 30(amps)

You have calculated that your power-consumption for the 48-hr period is equivilent to a "fixed" load with a constant, "steady" current-draw of 30 amps.

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