Solar photovoltaic cells convert sunlight directly into elec

Solar (photovoltaic) cells convert sunlight directly into electricity If solar cells were 100% efficient they would generate about 1000 watts of power per square meter of surface area when exposed to direct sunlight With lower efficiency, they generate proportionally less power For example. 10% efficient cells generate 100 watts of power in direct sunlight Suppose you want to supply 2 kilowatts of power to a house by putting solar panels on its roof. For solar cells with the average power of 21 watts per square meter of solar panels, how many square meters of solar panels would you need? Assume you can make use of the average power from the solar cells (by for example storing energy in batteries until it is needed) You would need square meters of solar panels (Round to the nearest integer as needed.)

Solution

2kW=2000 W of power is required

21 W per square meter of solar panels are required

So amout of square meters of solar panels needed is: 2000/21~95.24 square meter