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Old 08-09-2015, 09:00 AM   #1
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Watts Up?

Having just purchased a Honda 2000 generator, I am interested in finding out just how much current is drawn by appliances in my A122S, so that I know how many things I can have turned on at the same time and not go over the 13.? watt capacity of the gennie. Most appliances supply volts and amps figures only. I know there's a formula for determining watts by multiplying volts X amps, but multiplying any figure X 110 volts doesn't seem to work. Anyone know what I'm doing wrong with this?

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Old 08-09-2015, 09:12 AM   #2
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Having just purchased a Honda 2000 generator, I am interested in finding out just how much current is drawn by appliances in my A122S, so that I know how many things I can have turned on at the same time and not go over the 13.? watt capacity of the gennie. Most appliances supply volts and amps figures only. I know there's a formula for determining watts by multiplying volts X amps, but multiplying any figure X 110 volts doesn't seem to work. Anyone know what I'm doing wrong with this?

Kdot
Volts X Amps = Watts. So 120v X 13amps = 1560 Watts. That equals about the running max of the Honda 2000 generator.


Peak starting watts is 2000 watts.
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Old 08-09-2015, 09:14 AM   #3
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Originally Posted by kdot View Post
Having just purchased a Honda 2000 generator, I am interested in finding out just how much current is drawn by appliances in my A122S, so that I know how many things I can have turned on at the same time and not go over the 13.? watt capacity of the gennie. Most appliances supply volts and amps figures only. I know there's a formula for determining watts by multiplying volts X amps, but multiplying any figure X 110 volts doesn't seem to work. Anyone know what I'm doing wrong with this?

Kdot
The tag on the appliance usually has the voltage number for it. You may see 110, 115, or most usually now, 120 volts.

You can take:

Watts = volts (120) X amps

Here is an example using the tag for the electric heating element on a Suburban water heater. As you can see it is rated for 120 volts.

1440 watts = 120 volts X 12 amps

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Old 08-09-2015, 09:17 AM   #4
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And, those genny numbers quoted are often the peak output. I have the same genset and it will reliably put out about 1600w.

And, just for my anal need to be thorough, electrical motors need more power to start up; often called startup cost. Fridges and A/C units are notoriously high on startup cost. For less efficient models, double the amperage for about 1-2 seconds.


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Old 08-09-2015, 09:55 AM   #5
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Another way is to use a Kill-o-watt meter between your power source and the appliance. It will display volts, watts, etc to that appliance. More reliable than using a label.
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Old 08-09-2015, 10:31 AM   #6
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X2 Kilawatt. I keep mine in the RV
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Old 08-09-2015, 05:34 PM   #7
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Watt's Up?

Thanks everyone; I think I'm beginning to get it.

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