my blowdryer is 2 kW. The windmill only supplies 2.7 kW of electricity - probably at optimum windmill speed an maximum efficicency.
If you use a 2kW blowdryer 15 minutes per day and your electric rate is 10 cents per kWH, the blowdryer only costs 5 cents to use per day.
Most non-electically heated homes have a demand of 4 to 6kW. The windmill could only supply half of a peak (non-electric) household usage.
An on-site power source is best suited for creating some sort of stored energy - charging hot water - pumping water for storage... it will not be available for use at all times...
If you grid-tie, which I am assuming the OP would be doing, it wouldn't matter when you use versus when you make energy. As long as the electric company does net metering, it all works out in the end. Of course that's something to check.
As far as the *typical* load for a household, I'd say it's more realistic to consider it to be less than 4 kW at any point in time - probably less than 2kW on average. On a sunny day, we have a 2kW array of PV panels, and with the house up and running as usual, we sell back to the utlity when the sun is shining, which means we use substantially less than 2 kW at any point in time - EXCEPT when we run the oven or hairdryer.
As far as the windmill goes, if you assume it will run 50% of the time, best-case is you'll get about ~30 kW per day (this is a rough ballpark ignoring losses due to inverter, etc.), which should be more than sufficient to run most homes. Now will it run that much - dunno.
Depends on the area, the topography, lots of factors.
But IMHO a 2.7 kW windmill should at least make a substantial dent in an electric bill. As long as it is grid-tied, which I think would lean towards with a windmill so I didn't have to worry about where to dump power when I wasn't using what it was producing, I think it might offset our personal electric useage. Pretty cool! Now if only our neighborhoods covenants allowed it.
