How can I know how many solar cell do i need to provide a 200 m2 home ?

Question: if i want to use it to operate lights and fans only

Answer:
a light needs 60W , and a fan need 60 W. so if u have 10 lights and 5 fans u need 15 x 60=900W
a solar cell (1m x 2m) contains 90~100W so
for 10 lights and 5 fans u need 10 (1m x 2m) solar cell..
if the numbers of lights and fans different u can use the solution above..

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