ISOTRAP S
- Low-cost and optimal solution
- Horizontal and vertical panel placement
- Pre-assembled EPDM sealing
- 0.8 kg/m² lightweight design
What is ISOTRAP S?
ISOTRAP S is a versatile family of mounting systems designed for mounting solar panels horizontally and vertically on trapezoidal and sandwich-clad industrial roofs.
Available in four different profile heights – S20, S50, S60-NX, and S85 – the system adapts to various roof configurations and load requirements. Each variant is available in standard lengths of 290, 385, and 540 mm, as well as a longer length of 4,300 mm.
Thanks to profiles made of 6063-T66 aluminum alloy, universal EasyClamp clamps, pointed screws with gaskets and EPDM sealing tapes, the system offers a 99.9% leak-tightness guarantee. At only 0.8 kg per square meter, it places minimal load on the roof, while the EasyClamp system enables fast and reliable installation.
ISOTRAP S — How Does It Work in the Field?
Click the icon on the video for full screen.
Product Family
Choose the profile height that best suits your project
Technical Data
| Area of Use | Trapezoidal and sandwich-type pitched roofs |
| Variants | S20 / S50 / S60-NX / S85 |
| Profile Height | 20 / 50 / 60 / 85 mm |
| Profile Width | 86 mm |
| Length Options | 290 / 385 / 540 mm (+ 4,300 mm extra-long) |
| Panel Size (L) | 640 - 1,960 mm |
| Panel Size (W) | 990 - 1,010 mm |
| Panel Size (H) | 30 - 45 mm |
| Fixing | Sealed pointed screw / Waterproof rivet |
| Profile / Clamp | Aluminum 6063-T66 |
| Support | Aluminum 6063-T66 + EPDM |
| Fasteners | Stainless Steel A2-70 |
| Weight | ≈ 0.8 kg/m² |
| Layout | Horizontal and Vertical |
System Components
Panel carrier main profile (AL 6063-T66). S20/S50/S60-NX/S85 height options.
Universal end clamp for the exposed edges of panels. Compatible with 30-45 mm frame PV modules.
Universal center clamp for edges between two panels. Compatible with all ISOTEC systems.
It is glued to the underside of the profile to prevent leakage on the roof surface. (Integrated with the profile in S20)
The gasketed screw prevents leakage, secures the profile, and provides maximum durability.
Special rivet with EPDM protection and a 99.9% leak-tightness guarantee. Secures the profile and provides maximum strength.
Easy Assembly
-
1Marking According to the panel layout, the rib intervals where the profiles will be installed are determined and marked on the roof surface.
-
2Profile Placement ISOTRAP S profiles are placed on the ribs either by gluing the EPDM part (S50/S60-NX/S85) or directly (S20) according to the marking.
-
3Fixing Sealed pointed screws or waterproof rivets are mounted vertically to the roof at the points where they align with the rib. The opening of the seal should be observed.
-
4Clamp Assembly EasyClamp End (outer edges) or EasyClamp Mid (between panels) holders are installed on the assembled profiles, taking their positions into consideration.
-
5Panel Assembly The panels are fitted onto the profiles, and the panel assembly is completed by tightening the Allen bolts on the EasyClamp holders with a torque of 14-17 Nm.
Technical Documents
Download all technical documentation for the product.
Rooftop PV projects built with ISOTRAP S
Frequently asked questions
Which roofs is ISOTRAP S used on?
It is used on pitched roofs clad with trapezoidal sheet or sandwich panels. The profiles are fixed to the ribs of the roof cladding with sealed self-drilling screws or waterproof rivets.
What is the difference between S20, S50, S60-NX and S85?
The difference is the profile height: 20, 50, 60 and 85 mm. S20 is the economical option, S50 is for portrait layouts only, S60-NX is the most widely used standard profile, and S85 gives more airflow under the modules in high-irradiation regions.
Can the modules be installed portrait or landscape?
The system suits both portrait and landscape layouts; the S50 variant is for portrait layouts only. It is used with framed modules 640–1,960 mm long and 30–45 mm thick.
How much load does it add to the roof, and what is the warranty?
The system weighs about 0.8 kg/m². Profiles and clamps are aluminium 6063-T66, fasteners are stainless steel A2-70, and the system carries a 12-year warranty.
Let's work together to determine the most suitable ISOTRAP S variant for your project.
BF Attachment · Bifacial Shading Advantage
There are 2 different approaches in the industry. Why is ISOTEC's BF attachment both economical and high-performing?
Why is shading important in bifacial panels?
Bifacial (double-sided) solar panels generate electricity from both their front and back surfaces. The back surface captures radiation reflected from the ground and coming from the side edges — typically 15-20% additional output provides.
The critical point: Any part (purlin, beam, cable) that blocks light falling on the back surface of the panel → on the back surface shadow lines creates, and the cells under the shadow lose output. The purlin-to-panel distance and the purlin's cross-sectional area are the determining parameters.
Therefore, to get the most out of a bifacial investment, the design of the mounting system is critical.
Two Design Philosophies in the Industry
There are two main approaches in the industry to reduce bifacial shadowing:
Inclined C-Beam Competitors
The beam runs parallel to the panel at the same angle. A single long C-profile provides grip along the panel.
- ✓ Minimal shade, high bifacial yield.
- ✗ Long steel beams, high material costs.
- ✗ In sloping structures, column heights vary.
- ✗ Tolerances are difficult, installation takes a long time
Vertical Beam + Horizontal Z-Purlin ISOTEC + BF
The beams are vertical (perpendicular to the ground, short). The Z-profile purlins extend horizontally. A BF 56 mm spacer is inserted between the purlin and the panel.
- ✓ Low steel content, quick assembly, economical.
- ✓ Bifacial yield with BF adapter vs. Inclined-C equal
- ✓ Standard column, easy supply.
- ✓ Slot design compatible with thermal expansion.
CAD comparison — purlin-panel distances
How does the BF adapter work?
The ISOTEC BF adapter is placed between the Z-purlin and the underside of the panel as a spacer + clamp system. By creating a 56 mm gap, it maximizes the irradiance reaching the back surface of the panel.
Design features
- Spacer body: EN AW-6005A T6 anodized aluminum (3.0 mm wall)
- Distance: The distance between the purlin's top surface and the panel's bottom surface is 56 mm.
- Slot design: Panel thermal expansion accommodated (±2 mm tolerance)
- Screw: Stainless steel A2 M8×40 hexagonal
Clamp variations
| Code | Type | Usage |
|---|---|---|
| BFC | Glass-to-glass edge | For frameless glass-to-glass panels at panel edges. |
| BFC-E | Center grip | Center panel, shared grip, frameless. |
| BFC-SET | Complete set | All components are pre-packaged, quick assembly. |
CAD details — ISOTEC system
Bifacial Radiance Simulation Results
Results were obtained using NREL's (US National Renewable Energy Laboratory) open-source Bifacial Radiance Python library. A scan-based irradiance calculation that accurately reflects field conditions is performed.
Heat map comparison
Warm (yellow) colors indicate high irradiation (1.77 MWh/m² annually), while cool (blue) colors indicate shaded areas. In both systems, the front surface of the panel (the upper yellow area) receives homogeneous irradiation; the difference appears on the panel's rear surface .
Numerical results
| System | Bifacial Gain | Shadow Line | Cost |
|---|---|---|---|
| Inclined-C (Competitor) | ~%18-20 | 1 big | 💰💰💰 High |
| ISOTEC + BF Adapter | %18 | 2 small | 💰 Economical |
| ISOTEC (without BF adapter) | ~%10-12 | 2 nearby shadows | 💰 Lowest |
The same bifacial production, shorter beam, less steel, faster assembly. The cost difference is significant at the field scale.
