What you were looking at was an off-grid system. Off grid is very expensive on account of the batteries, and because of that, when people have an off-grid cabin, they will generally be much more conservative on energy use than the average American household. They may do all their cooking and heating with propane, avoiding that use of electricity. They might go with fans instead of air conditioning.

Note that most people who install photovoltaic go grid-tied, that is, without batteries. The array can be as large as there is room for, if a professional installs it. And in a sunny area, you may not even need a very large system. Our grid tied system is less than half the size of the one in your link, and supplies about 100% of our electricity, averaged over the course of a year.

The US has average 12:11 of daylight with 65% sunlight (less clouds). The typical household is awake 15 hours 100% of the time. So there's a big deficit to make up.

Yes and no. Not all houses are average and not all solar installations produce the same amount of power. If you have a large solar array and a very energy efficient house then the solar array CAN supply all the power the house needs. Clearly if the solar array is small and/or the house uses a lot of energy, then the solar array cannot supply all the power.

If you want to produce 98% of your electricity,

Peak Sun 8 Hours do you get per day

903 Kilowatt Hours (KwH) per month To produce 4,793 watts..... 4,793 divided by 140(watts per panel) = 34.25 means 35 number of solar panels needed.

24 watts

Youll find everything tyou need here

http://etangelosolar.kickoffpages.com/

24watts....?

The average household in America consumes 903 kilowatthours (kWh) per month. A solar panel for a large house produces up to 889 kWh for $17,819.00 according to http://www.wholesalesolar.com/products.folder/systems-folder/OffGridPackages.html

Wouldn't that mean solar can't produce enough energy to power the house? I'm no expert what so ever so i need help.