Calculation the cost of solar power plants

Using solar panels is currently funding it needs if it is still very expensive for large-scale electricity madiri long time back up 24 hours a week. But if to be used as an alternative reserve can still be utilized only at a cost which is affordable for some people. What about the formula to determine the solar panel and battery used? Below you can learn Purposes of the calculation of power (electric power calculation device can be seen on the label on the back of the device, or read from the manual):

Home lighting: lamp CFL 10 Watt x 4 @ 15 hours a day = 600 Watt hours.
Televisions 21 "@ 100 Watts x 5 hours per day = 500 Watt hours
Fridge 360 ​​liters @ 135 Watt x 24 hours x 1/3 (for refrigerator compressor does not always live, they generally work more often when the refrigerator door is opened more often) = 1080 Watt hour
Computers: @ 150 Watts x 6 hours = 900 Watt hours
Other devices hour = 400 Watt
Total power requirement = 3480 Watt hour

The number of solar panels required, we calculate a 100 Watt panel (the calculation is the solar maximum 5 hours):

The need for solar panel modules: (3480/100 x 5) = 7 solar panels.

The amount of 12 Volt battery with 100 Ah each:

The need for minimum battery (battery is only used 50% for electricity needs), so we multiply the power requirement of 2 x folding: 3480 x 2 = 6960 Watt hour = 6960/12 Volt / 100 Amp = 6 100 Ah batteries.
Needs batteries (with consideration to serve the needs of three days without sunlight): 3480 x 3 x 2 = 20 880 Watt hour = 20880/12 Volt / 100 Amp = 17 100 Ah batteries.
To calculate the cost of consulting a solar panel installation please check with the experts. Thank you