Roof Not Ready? After a Full Roof Replacement, This 343.7 kW Solar System (Roof + Carport) Is Now Powering a Site in Typhoon-Prone Suzhou

Intro: Two Phases, One Mission – Long-Term Performance Over Shortcuts

In this post, Amosolar shares how a two-phase solar project in Suzhou tested technical judgment, site discipline, and project control.

The project combines a 280 kW rooftop photovoltaic system and a 63.7 kW solar carport. But the real challenge wasn’t the installed capacity – it was knowing when to pause, redesign, replace, or wait to protect long-term performance under the pressure of Jiangsu’s typhoons, heavy rainfall, roof load limits, and tight deadlines.

First Challenge: The Roof Wasn’t Ready

The existing corrugated steel roof showed serious corrosion. Installing solar panels directly would have created high risks for long-term safe operation.

So we made a hard but right call: replace the roof first.
This delayed the simpler construction path but eliminated the risk of major future failures – and gave the project a truly robust structural foundation.

Choosing the Right Solar Panels for Different Constraints

For the rooftop system – we used 450W solar panels.
Why? Because the roof area was large enough. A lighter, lower-cost design was possible without forcing high-end modules.

For the carport system – we chose 650W BC solar panels (back-contact, high efficiency).
Parking space was limited, and the steel structure cost was high. Here, power density matters more than the module price. Every square meter counts.

✅ Rooftop: 450W solar panel – cost-effective, light, reliable
✅ Carport: 650W BC solar panel – high density, high performance

Designed for Jiangsu’s Tough Weather

• Roof structure: High-strength, lightweight materials reduce roof load while maintaining strong wind resistance for summer storms.
• Carport design: Widened eaves edges, two-meter-deep drainage system, and floor expansion joints – rainwater flows away, never pools.

Real-World Validation Before Expansion
The client chose to wait before approving the carport phase. Why?
They wanted the roof photovoltaic system to prove itself first – including surviving the typhoon seasons of 2022 and 2025.
The roof system performed. That real-world weather test built more confidence than any initial promise. Sometimes, waiting is the smartest move.

No Shortcuts in Pre-Connection Inspections
Before going live, we ran full checks on:
Insulation, grounding, PV string voltage, wiring
Inverter response, anti-islanding, power quality, grid synchronization
And a final visual inspection for damaged components, loose cables, and frame grounding.
Catching small issues onsite prevents them from turning into after-sales problems.

Unavoidable Schedule Issues – And a Lesson
The carport was delayed because the customer’s specified brand of EV chargers arrived late – and the electrical design & commissioning depended on them.
Key lesson: When customers require specific brand equipment, confirm delivery dates early. One component delay can push the entire compact project schedule.

Practical Conclusions

This project proves that excellent EPC execution is not just about fast installation.
It’s about knowing:

• When to pause
• When to replace
• When to redesign
• How to protect long-term system performance

At Amosolar, we build solar that lasts – through typhoons, rain, and tough site realities.