Comment: No, you are missing the

(See in situ)

No, you are missing the

No, you are missing the point. This isnt about cost, its about energy usage at a given time. Yes, a kw hour doesnt cost but a few cents, but that doesnt tell you much about your peak usage.
Something might be rated as working at 500 watts, but when you first turn it on(in the case of a motor) you get a spike which depends on a few things. If you have ever noticed your lights flicker or something similiar when your central air comes on or when starting a vacuum then you have seen this effect; all the power is being run to that device to start it basically. Having a low cap would mean that you couldnt ever start anything like a vacuum without tripping the breaker even if the device was under the limit for normal usage.

Even though the devices are low energy, that just means you can run more of them at once. As an example though, say you have a small 5 room place each with a light bulb etc. Say the lights are equivalent 20 watts each, if you have a person in each room, that is already 100 watts being used. However, lighting typically isnt much of a problem. Lets add in there a computer, say a desktop or a laptop, that will likely be 150-200 watts of power at least, more if its a desktop with monitor. There are smaller devices of course. So with that say you now have 300 watts being used. Add another 50 for various small devices like ipod chargers, clocks, etc. Add another 100 for a small-mid sized tv.
Now we are at 450 and this is obviously an estimate as tvs can go from 70 watts all the way up to 400 depending on size.
Lets add in a fridge and thats likely another 100 watts. It does vary though.
So with basic stuff, we are already to 550 watts and havent even gotten to things like heaters or washing machines which would be impossible to add in at this point unless you turn everthing off.

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