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Installing the System
Installation Requirements - Specific
The homeowner and contractor shall confirm the
location of all roof and ground mounted components
in advance of the installation.
Collector Orientation
The performance of solar water heating systems
in the Northern Hemisphere is optimized when
the collector is mounted facing True South.
Performance, however, suffers very little when the
collector is oriented no more than 45° East or West
of True South. The collector should be unshaded
by any permanent obstacle between 9:00 a.m. and
3:00 p.m. on any day of the year.
Figure 1 - Reverse Pitch Mounting
Collector Tilt
Optimal annual efficiency is achieved by tilting the
solar collector at an angle that equals your latitude
plus an additional 10°. This tilt angle favors the
lower winter sun when collector performance is at
it's lowest and minimizes overheating during the
hottest summer months.
LATITUDE
COLL. TILT
FLAT
5°
1/12
9°
2/12
14°
3/12
18°
4/12
ROOF
23°
5/12
PITCH
27°
6/12
30°
7/12
34°
8/12
37°
9/12
40°
10/12
43°
11/12
45°
12/12
10
25°N
30°N
35°
40°
A
B
A
B
29
96
33
113
25
83
29
93
22
74
26
82
17
66
22
72
14
61
18
66
10
58
14
60
7
58
11
58
4
58
8
58
0
58
5
58
0
58
3
58
0
58
0
58
0
58
0
58
0
58
0
58
DIMENSIONS A AND B ARE DESIGNATED IN INCHES
Figure 2 - Side Pitch Mounting
The solar collectors in a two collector staggered
mount installation must be spaced far enough apart
to prevent winter shading. Table 1 shows the correct
spacing between collectors to prevent shading on
December 21, when the sun is at its lowest angle.
Figure 3 - Staggered Mount Collector Spacing
TABLE 1
35°N
40°N
45°
50°
A
B
A
37
145
41
145
33
113
37
132
30
77
34
110
26
82
30
22
74
26
18
66
22
15
61
19
13
58
17
9
58
13
7
58
11
4
58
8
2
58
6
0
58
4
45°N
50°N
55°
B
A
B
A
44
145
48
41
133
44
38
115
41
92
34
95
38
82
30
85
34
72
26
74
30
66
23
68
27
62
21
65
25
58
17
60
22
58
15
58
19
58
13
58
17
58
10
58
14
58
8
58
13
60°
B
145
141
118
98
87
77
70
66
62
58
58
58
58
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