Mechanical design
How should module mechanical-load claims and mounting zones be reviewed?
Connect declared photovoltaic module load evidence to the actual support layout, clamps, rails and site design.
Short answer
A published load value applies only with the stated test basis and mounting configuration. It is not a universal allowable roof load or a substitute for structural design; clamp zones, support count, orientation, hardware and site actions must match approved evidence.
Mechanical design
Read the test configuration
Record whether the declared value refers to front or rear loading, the support arrangement, clamp location and test method. Do not copy the number without its configuration.
Match the mounting interface
Confirm rail direction, support span, clamp length and position, frame engagement, fasteners and installation torque against current instructions.
Keep structural responsibilities clear
Project wind, snow and other actions, safety factors, roof capacity and attachment design require qualified engineering. Module evidence is one input to that work.
A test-configuration-to-site matrix
A load number is incomplete without the configuration that produced it.
| Field or step | Example entry or evidence to record |
|---|---|
| Test evidence | Model and drawing revision / test or design-load label / front or rear direction / support count / clamp zone and length / source report. |
| Site proposal | Orientation / rail layout / span / clamp position and hardware / fastening instruction / wind and snow cases / roof and attachment calculation. |
| Mismatch record | Identify every changed interface and obtain documented approval for the exact configuration. Do not derive a clamp zone, torque or permissible load from a generic datasheet icon. |
Record template: replace prompts with project evidence and retain unresolved items. It does not authorize purchase, installation or release.
Project checklist · Mechanical design
- Exact model and drawing revision
- Declared load and test basis
- Approved mounting zones
- Rails, clamps, fasteners and torque
- Project structural calculation
FAQ
Frequently asked questions
Is a test load the same as allowable roof load?
No. They describe different scopes and calculation responsibilities.
Can clamps be moved outside the stated zone?
Only with documented approval for the exact configuration.
Does module certification approve the roof structure?
No. Roof and attachment design remain project-specific.
Sunhorn
Turn the reading into a model-specific review.
Share the application, target power range, destination and order requirements so the exact datasheet can be checked against the project.