Solar Energy Systems 01.09.2009
Page
21
Mounting Directions for In-Roof Photovoltaic Systems
Ernst Schweizer AG, Metallbau, CH-8908 Hedingen, T41 44 763 61 11, T41 44 763 61 19, www.schweizer-metallbau.ch
R_ver
R_ver
R_ver
R_hoz
R_hoz
R_hoz
Image 4-2: Standard grid plan for a generator array with 9 modules (3x3)
Substructure
TIP
Heat emitted by the photovoltaic modules decreases the efficiency of the system. Proper ventilation of the
modules will minimize this loss effect.
High module temperatures lessen the system’s efficiency.
Plan for a generous horizontal air gap for ventilating the modules (counter-battens as with a normal roof).
1. Fasten the substructure battens with ample fasteners directly on to the roof.
2. Align the substructure with the position of the mounting clamps for the photovoltaic modules (cf. grid plan).
3. Close off the open cross cut between the eaves-side battens with a protective screen against birds, etc.
4. If possible, convert the roof ridge into an aeration ridge in order to divert the warmth.
5. Use eaves-side skirting (lead roll or Mage flex
®
strip) for the crossover from the lower edge of the system to the
tiles.
WARNING
IEC 61215 (ed.) certification of the modules is only valid in connection with a specifically defined substructure!
Use mounting boards with a cross-section size of 30 x 100 mm for the substructure
Softwood construction
grade timber
Only this minimum cross-section size of the boards guarantees the load transmission of the screws.
Fasten the mounting boards on the roof structure using only appropriate and approved fasteners.
