3. A house with a south-facing roof has photovoltaic panels on the roof. The photovoltaic panels have an efficiency of 10% and occupy an area with dimensions 6 m by 9 m. The average solar radiation incident on the panels is 360 W/m², averaged over all conditions for a year. How many kilowatt hours of electricity will the solar panels generate in a 30-day month? {1400kW h}
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Given that the dimensions of the panels are 6m by 9m, the total area is: Area = 6m * 9m = 54 square meters Show more…
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(i) An average modern photovoltaic solar panel will produce 18 to 20 watts per square foot of solar panel area. If the roof area is 6 meters by 10 meters, what will be the electric power it will produce? (ii) Generally, a solar energy system will provide output for about 5 hours a day. Then, for the above output power obtained for the system size in (i), and it produces for 5 hours a day for half a year, what will be the energy that the system will produce?
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The solar panels on the roof of a house measure $4.0 \mathrm{m}$ by $6.0 \mathrm{m} .$ Assume they convert $12 \%$ of the incident EM wave's energy to electric energy. (a) What average power do the panels supply when the incident intensity is $1.0 \mathrm{kW} / \mathrm{m}^{2}$ and the panels are perpendicular to the incident light? (b) What average power do the panels supply when the incident intensity is $0.80 \mathrm{kW} / \mathrm{m}^{2}$ and the light is incident at an angle of $60.0^{\circ}$ from the normal? (W) tutorial: solar collector) (c) Take the average daytime power requirement of a house to be about 2 kW. How do your answers to (a) and (b) compare? What are the implications for the use of solar panels?
On a sunny day, solar energy reaches Earth at a rate of 4.0 J min $^{-1} \mathrm{~cm}^{-2}$. Suppose a house has a square, flat roof of dimensions $12 \mathrm{~m}$ by $12 \mathrm{~m}$. Calculate how much solar energy reaches this roof in $1.0 \mathrm{~h}$. (Note: This is why roofs painted with light-reflecting paint keep buildings cooler than black, unpainted roofs. The painted roofs reflect most of this energy rather than absorb it.)
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