Thursday, August 13, 2009

What is a kilowatt and how can a wind turbine produce enough power for a whole house?

Some people do not understand what a kilowatt is or even less what a kilowatt hour is.
Lets start with what is a watt. A watt is the unit used to measure power, equal to one joule per second. In electricity, a watt is equal to current (in amperes) multiplied by voltage (in volts).
A kilowatt is a thousand watts.

Lets take an example on how to figure out what a kilowatt hour is. Say you have a 100 watt light bulb on for 10 hours. That 100 watt light bulb used 1000 watts of power, divided by 1000 or 1 kilowatt hour.

Now the average home uses 750 kWh a month so that means it uses 750,000 watts a month or it is like leaving around 10.4- 100watt light bulbs on all day for one month.

Wow that is a lot of power when you stop and think about it.

But some people say that a wind turbine can not power a house because it is only 2.4kw or 24- 100 light bulbs and it does not run all the time. But I say it can. Here is why, just because it does not run all the time does not mean it does not power your house. You have to look at how many kilowatt hours it produced, not how much power it generates that moment. For example a turbine may produce nothing for one day. But the next day it produces 30 kWh for the whole day. Then following day it produces 5 kWh and so on for the whole month until you get a total amount for that month. Say it produced 400 kWh for the month and you used 500 kWh. For that month your cost was offset by that 400 kWh your turbine produced. Now you will only pay for that 100 kWh from the power company. See how that works, your turbine did not run all the time but it produced power for the whole house, none the less, saving you money in the end.

It also depends on how much you use on an average month, the size of your wind turbine, and how much wind there was for that month.

So if you do the math the turbine will produce enough power for the whole house.

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