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Old 02-15-2009, 11:15 PM   #1
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AMP Reading/Calculations


I have a whole house power monitoring system that I use to monitor my power usage. It outputs so many pulses for every watt used across the two legs.

I am working on a formula to show me the current AMPs and watts being used.

When I put my clamp on meter on one of the 120 VAC legs at the meter, it'll read say 10 amps and the other leg might read 15 amps, so I am using 25 amps of power, correct?

So 200 amp service means each leg can handle up to 100 amps and when you add the two together that is where the 200 amp rating comes into play?

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Old 02-16-2009, 07:50 PM   #2
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AMP Reading/Calculations


If you have a 200 amp service, each leg is capable of 200 amps.

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Old 02-16-2009, 08:10 PM   #3
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AMP Reading/Calculations


Quote:
Originally Posted by AndrewF View Post
I have a whole house power monitoring system that I use to monitor my power usage. It outputs so many pulses for every watt used across the two legs.

I am working on a formula to show me the current AMPs and watts being used.

When I put my clamp on meter on one of the 120 VAC legs at the meter, it'll read say 10 amps and the other leg might read 15 amps, so I am using 25 amps of power, correct?

So 200 amp service means each leg can handle up to 100 amps and when you add the two together that is where the 200 amp rating comes into play?
Yes you add the 2 numbers to get your total use.
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Old 02-16-2009, 08:18 PM   #4
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AMP Reading/Calculations


It is all a matter of reference.
You are using 10 amps at 240 volts and 5 amps at 120 volts.
OR
You are using 25 amps at 120 volts
In both cases you are using 3000watts.

Edit: to correct the numbers. I misread as 15 amp on one leg and 25 on the other instead of 10 and 15.

Last edited by joed; 02-17-2009 at 08:42 AM.
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Old 02-16-2009, 08:46 PM   #5
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AMP Reading/Calculations


120V x (10+15)A = 3000W?

200A x 240V = 48kW.

24kW/120V = 200A.

Can you post a make and model for your power monitor?

Why not just read your PoCo meter?

Last edited by Yoyizit; 02-16-2009 at 09:02 PM.
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