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OK, simplicity is not real easy for me but I am going to try.
1 kw is 1000 watts. 1 Kwh is 1kw used or produced for 1 hour.
a 3.5 kw generator has the capacity at optimum output to produce 3.5 Kwh per clock hour. So this would be 84 Kwh / day 2352 kwh / 4 week period
You are best to expect a 40% production based on wind speeds changing, so this is 33.6 kwh / day or 940.8 / 4 week period.
You can look at your electric bill it tells you Kwh usage and cost.
When you produce more power than you are using it spins the meter backward (based on utility company)
You can impliment batteries for storage but that gets very expensive quickly.
These units are designed to be suplemental not 100% of required power. For an example a total electric Central heat and air unit may have up to 30KW heat strips with an additional 3 kw draw to run the motor. If you had lights and TV and other household items running you would need 40-50 kw to run the houses needs. By suplementing the usage and providing the basic functions for the day when you are using 5kw on average the suplemental system produces excess when you are gone, or alseep and many items are not in use giving a usage credit at the meter. The average house uses 2500 KWh a month.
Hope that helps call if you would like to discuss more intensly.
