1. Understanding PV Mounting Structure Failures
Before performing any repair, it is critical to understand the common failure modes of solar mounting systems.
Common Failure Types
| Failure Type | Description | Typical Cause |
|---|---|---|
| Rail deformation | Bent or twisted aluminum rails | Overload, snow pressure, improper installation |
| Corrosion | Surface oxidation or pitting | Low-quality anodizing, coastal salt spray |
| Loose connections | Bolts or clamps slipping | Vibration, thermal expansion, incorrect torque |
| Flashing failure | Water leakage around roof penetration | Worn rubber seals, cracked flashing plate |
| Grounding discontinuity | Loss of electrical continuity | Broken bonding jumpers, corroded washers |
2. How to Diagnose PV Mounting System Damage
A systematic diagnostic approach minimizes downtime and prevents secondary damage.
Step-by-Step Diagnosis
Visual Inspection (Annual or after storms)
Check for bent rails, loose clamps, or displaced flashing.
Look for white rust (aluminum corrosion) or black spots (oxidized seals).
Torque Verification
Use a calibrated torque wrench to verify all bolts meet specified values (typically 15–20 N·m for module clamps).
Water Penetration Test
Pour water around flashing areas and observe for interior leaks after 24 hours.
Grounding Continuity Check
Measure resistance between module frames and the grounding lug using a multimeter. Acceptable value: <1 ohm.
Structural Load Assessment
Compare current snow/wind loads with the mounting system's design rating. Recalculate if roof modifications have occurred.
3. Repair Procedures for Common PV Mounting Issues
Safety First: Always disconnect the DC isolator before touching any metal parts. Use personal protective equipment (PPE) including insulated gloves and rubber-soled shoes.
Repair 1: Replacing a Corroded L-Foot
Tools needed: Impact driver, socket set, new L-foot with AA10 anodizing, stainless steel bolts.
Steps:
Remove the module clamp and lift the adjacent solar panel (support with suction cups).
Unscrew the corroded L-foot from the rail and roof attachment.
Clean the mounting surface with a wire brush.
Install the new L-foot using fresh stainless steel fasteners. Torque to specification.
Reinstall the panel and clamp.
Repair 2: Fixing a Leaking Flashing Kit
Tools needed: Pry bar, caulking gun, replacement Waterproof PV Solar Mounting Flashing Kit, roofing sealant.
Steps:
Remove the tile or shingle covering the damaged flashing.
Extract the old flashing plate and L-bracket.
Slide the new Waterproof PV Solar Mounting Flashing Kit under the upper shingle layer.
Apply roofing sealant to the swelling round interface before securing the L-bracket.
Reinstall the shingle and verify no gaps remain.
Repair 3: Tightening Loose Module Clamps
Tools needed: Torque wrench, extension bar, clamp alignment gauge.
Steps:
Identify all loose clamps by attempting to rotate them by hand.
Loosen each clamp slightly, reposition it to the center of the module frame, then retighten to 18 N·m.
Perform a pull test – the clamp should not slide under 50 kg of hand force.
4. Warranty Process for Solar Mounting Systems
Longsun Green provides a structured warranty covering material defects and corrosion resistance.
Warranty Coverage Table
| Component | Warranty Period | Coverage |
|---|---|---|
| Aluminum profiles (6005-T5) | 25 years | Structural integrity, no bending under rated load |
| Anodized layer (AA10) | 15 years | No pitting corrosion or white rust |
| Stainless steel fasteners | 10 years | No red rust or thread stripping |
| Rubber/EPDM seals | 5 years | No cracking or loss of elasticity |
Exclusions (Not Covered)
Damage from improper installation (wrong torque, incompatible tools)
Physical damage from fallen trees, hail >25mm, or wildfires
Modification or welding performed by non-certified personnel
Use with non-approved module brands or frame thicknesses
Step-by-Step Warranty Claim Process
Step 1 – Document the Failure
Take clear photos showing the damaged part, serial number (etched on rail end), and overall installation.
Record the installation date, purchase order number, and weather conditions prior to failure.
Step 2 – Contact Longsun Green Support
Email: amber@longsungreen.com
Provide your documentation and a brief description of the issue.
Step 3 – Preliminary Diagnosis (48-hour response)
Our engineers will review your photos and request additional measurements if needed (e.g., rail span, torque values).
Step 4 – Replacement Part Dispatch
If a manufacturing defect is confirmed, Longsun Green ships replacement components within 3 business days from Xiamen Port.
Step 5 – Local Repair or Replacement
For minor parts (clamps, bolts, flashing kits), self-repair is guided by our online video manual.
For structural rails, we recommend using a certified local solar installer. Longsun Green reimburses reasonable labor costs (capped at $150 per incident).
5. Preventive Maintenance to Extend System Life
Regular maintenance reduces warranty claims and maximizes ROI.
Recommended Schedule
| Frequency | Task |
|---|---|
| Monthly (visual) | Check for loose debris, bird nests, or vegetation touching the array. |
| Quarterly | Inspect flashing seals and ground continuity. |
| Annually | Torque verification, corrosion inspection, and cleaning of drainage channels in rails. |
| After storms | Immediate inspection for lifted shingles, bent rails, or shifted panels. |
Best Practices
Use only stainless steel (SUS304) replacement bolts – never mix metals.
Apply anti-seize compound on threads when reassembling in coastal areas.
Keep a spare kit of common parts: 10 clamps, 20 bolts, 2 flashing kits, and 4 L-feet.
6. Case Study: Successful Warranty Resolution
Project: 250 kW residential community, Hainan Island (high humidity, salt spray)
Issue: After 6 years, 12 L-feet showed surface white rust. No structural failure, but homeowner requested replacement.
Action taken:
Homeowner sent photos and installation records to Longsun Green.
Our team confirmed the anodizing layer was thinner than AA10 spec on that specific batch (manufacturing variance).
Within 5 days, 24 upgraded L-feet (AA15 anodizing) were shipped.
Local technician replaced all affected feet in 3 hours. Labor reimbursed.
Result: System returned to full corrosion protection. The customer extended their maintenance contract for another 5 years.
7. Why Choose Longsun Green for Mounting Solutions?
| Feature | Benefit |
|---|---|
| ISO9001:2008 certified | Every batch traceable with inspection records |
| ERP smart warehousing | Spare parts shipped within 24 hours from Xiamen |
| 15–25 year warranty | Backed by material testing and salt spray validation |
| Global technical support | English/Mandarin support via email with 48-hour response |
