10
Table 3:
Shading intervals, front edge to front edge [mm] depending on the roof pitch and angle of insolation
Angle of insolation
12°
13°
14°
15°
16°
17°
18°
Roof pitch
Shading intervals from front edge to front edge [mm]
6°
2331
229
215
2109
20
1991
190
5°
221
2331
229
215
2109
20
1991
4°
2523
221
2331
229
215
2109
20
3°
238
2523
221
2331
229
215
2109
2°
29
238
2523
221
2331
229
215
1°
2920
29
238
2523
221
2331
229
0°
3095
2920
29
238
2523
221
2331
- 1°
3302
3095
2920
2
238
2523
221
- 2°
359
3302
3095
2920
2
238
2523
- 3°
3851
359
3302
3095
2920
2
238
- 4°
228
3851
359
3302
3095
2920
2
- 5°
12
228
3851
359
3302
3095
2920
- 6°
5355
12
228
3851
359
3302
3095
B3
Shading table
Sample calculation of required ballast
The ballast required for a building with the following data has been calculated as follows:
• Building height h = 8m
• Basic building size 10x20m
• Class III
• Individual Suntubs to be joined (optional)
• Roof pitch 2°
• Angle of insolation 1°
1. PV system distance from edge:
a1=a2=0,2x8,0=1,0m
2. Ballast
Building height h=8m, joined rows → Table 2:
• Centre ballast 83,9 kg and
• Edge ballast 10,9 kg
3. Shading interval
Front edge to front edge: 2.523 mm
Required ballast
Centre
83,9 kg/Suntub
Edge:
104,9 kg/Suntub
20
a1
10
a2
8
Fig. B5.1
