Quality Control as Standard: Why Every PV Installation Must Be Checked
A PV system not properly checked during installation becomes a risk – for the customer and for the installation company. Complaints, water damage, and performance losses can be avoided through systematic quality control. This checklist covers the most important inspection points.
Checklist: Roof Mounting
- Roof hooks fastened with correct torque
- Tiles undamaged and lying flat after hook installation
- Mounting rails straight and securely screwed
- Module clamps secured with correct tightening torque
- Mounting frame continuously and correctly grounded
Checklist: Cable Routing on the Roof
- Cables secured with UV-resistant cable ties
- No contact between cables and sharp edges
- Sufficient bending radius at all deflection points
- Cables not under tension – loops provided for length compensation
- Positive and negative cables routed separately (fire protection)
Checklist: Roof Penetration
- Penetration lying flat on the tile
- No visible gap between penetration and tile surface
- Overlap with the tile above correct
- Cables firmly seated in the penetration, no movement possible
- Correct variant installed (number of cables matches string planning)
- Penetration length matches the roof structure
Why the penetration deserves special attention
The roof penetration is the only point where the roof skin is actively breached. An error here leads directly to water ingress. NEXCAPE penetrations made of TPU minimize this risk due to their flexible material, which conforms to the tile profile and can be installed tightly even without tools.
Checklist: Electrical Inspection
- Open-circuit voltage of each string measured and documented
- Short-circuit current of each string measured
- Insulation resistance checked
- MC4 connectors checked for secure fit
- Inverter parameterization correct
Don't Forget Documentation
All inspection steps should be documented – as proof to the customer and as security in the event of a warranty claim. Photos of critical points (especially roof penetration and cable routing) belong in every acceptance protocol.
NEXCAPE roof penetrations are manufactured using a 3D printing process in Germany from UV-resistant TPU. Variants for 2, 4, and 6 PV cables – also with PE – in lengths of 105, 125, and 150 mm. B2B conditions from 20 units.
Quality starts with the material – discover now: View PV Roof Penetrations
