Chapter 10, Problem 32E

Interpretation Introduction

Interpretation:

The average solar power in kilowatts and the number of kilowatt-hours that fall on the rooftop in one year are to be calculated and whether the roof receives enough energy to meet the energy needs or not and the minimum percent efficiency of the solar cells are to be determined.

Concept Introduction:

Power input on a PV cell is the total active area of the PV cell multiplied by the solar power.

The percent of the input power that is converted into the output power by a PV cell is called its efficiency.

Percent efficiency of a PV cell is 100 multiplied by the ratio of power out and power in.

$\text{\% efficiency}=\frac{\text{power out}}{\text{power in}}\times 100\%$ …… (1)