**Third-Party Organizations for the Safety Appraisal of Distributed Photovoltaic Roofing Houses**
Distributed photovoltaic roofing house safety appraisals are conducted by independent third-party institutions. Our company is a legally established, independent entity with top-tier qualifications in construction inspection, foundation engineering, steel structure testing, and on-site structural assessments. We have departments such as Building Inspection, Business, Technical Quality, and Finance. As a building engineering testing and appraisal unit affiliated with a major domestic testing company, we hold certifications from the State Bureau of Quality and Technical Supervision. We are a first-level construction engineering inspection organization in Guangdong Province, with special qualifications in steel structure testing and main structure inspections.
Our services include witness sampling, building quality testing, seismic evaluation, structural reliability appraisal, curtain wall testing, and more. We issue fair, legally valid, and authoritative reports. With a wide range of technical qualifications, including the "Engineering Testing Qualification Certificate" and "Metrics Qualification Certificate," we provide reliable and accurate testing services to our clients.
We specialize in distributed photovoltaic systems and their structural compatibility with rooftops. Our team ensures that all installations meet safety and regulatory standards. Whether it's assessing existing structures or designing new systems, we focus on accuracy, efficiency, and long-term performance.
**Characteristics of Distributed Photovoltaics**
Distributed photovoltaic power plants are designed for local generation and grid connection, typically with an installed capacity below 20 MW. They are ideal for areas where grid access is convenient, allowing for localized energy use. The EPC (Design, Procurement, and Construction) model is often used due to its cost-effectiveness and risk management benefits.
However, distributed projects face challenges such as dispersed locations, complex design requirements, and varying load conditions. For example, in coastal regions like Guangdong, typhoon resistance must be considered. Each project requires customized solutions, including roof load analysis, grid connection planning, and efficient cable layout to minimize transmission losses.
**Case Study: Structural Safety Assessment of a Steel Frame Building**
Using the STK module of PKPM (V3.1), we modeled a typical rigid frame (1–7/E axis) based on measured structural data. The assessment included checking the bending moments, buckling resistance, and stability of steel columns and beams.
Under original loads, most components met the required safety standards, but some steel columns showed insufficient out-of-plane stability. After adding photovoltaic panels, several columns exceeded stress limits, indicating the need for reinforcement or redesign. The steel beams also showed increased bending moments beyond acceptable levels, requiring further evaluation.
**Testing and Appraisal Content and Basis**
Our comprehensive appraisal includes:
1. Review of the building’s history and usage
2. Inspection of structural drawings
3. Evaluation of visible defects and structural damage
4. Material strength testing of steel components
5. Deformation measurements (settlement, verticality, deflection)
6. Load-bearing capacity checks
7. Final structural analysis and report
The technical basis follows national standards such as GB/T 50344-2004, GB50009-2012, and GB50017-2003, ensuring accurate and reliable results.
**Current Development Status of Technology**
While China's photovoltaic technology is advancing, large-scale rooftop applications remain limited. Most projects are still in the early exploration phase due to complex building structures and load conditions. Concrete roofs are easier to install on, but many industrial buildings use pressed steel slabs, which present unique challenges. Current technologies are not yet fully developed for these types of installations.
Additionally, maintenance of existing power systems can be costly and inefficient. Rooftop photovoltaic systems offer a practical solution by supplementing backup power during peak hours. At the Beijing West Railway Station, for instance, we implemented safety measures during steel structure welding to prevent accidents and ensure smooth project execution.
**Company Commitment**
We are committed to providing high-quality, impartial, and legally binding testing and appraisal services. Our team adheres strictly to regulations and industry standards, ensuring transparency and accuracy. We welcome inquiries and look forward to offering professional, efficient, and customer-focused services.
For more information or to schedule a consultation, please contact Manager Li at 15999691719.
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