1. (25 pts) A solar panel is mounted facing due south in a location at 40° N latitude, with a tilt angle of

38° (south facing). If the sun shines on the panel for the entire day on the spring equinox with clear

skies, calculate the total energy incident per square meter on the panel during the course of the day in

kWh/m². (Use the direct normal values shown in the table below).

Hour

1

2

3

4

5

6

7

8

9

10

11

12

13

15

16

17

18

19

20

21

22

23

24

Normal

Irradiance

[w/m2]

0

0

0

0

0

130.00

480.00

756.00

875.00

892.00

908.00

915.00

908.00

892.00

875.00

756.00

480.00

130.00

0

0

0

0

0

0

2. (10 pts) A house at 48° N latitude has a roof that faces due south, and is elevated to an angle of 28°.

A solar panel is mounted to the roof. What is the angle of incidence between the sun and the array.

1 p.m. on June 1?