Zhejiang Hangzhou Qiantang District 640kW Microinverter Photovoltaic Power Station Project

Zhejiang Hangzhou Qiantang District 640kW Microinverter Photovoltaic Power Station

Module-level MPPT · Low-Voltage DC Safety · Efficient Power Generation on Complex Rooftops | 680,000 kWh Annual Generation · 677 Tons CO₂ Reduction · 5–6 Year Payback

Safe & Efficient Rooftop PV Solution for Commercial & Industrial Buildings

Basic Project Information

Project Location: Commercial and industrial rooftop in Qiantang District, Hangzhou, Zhejiang
Installed Capacity: 640 kWp
System Type: All-microinverter distributed photovoltaic system
Operation Mode: Self-consumption with surplus electricity fed into the grid
Construction Period: 45 days
Commissioning Date: 2024
Average Annual Power Generation: Approximately 680,000 kWh

Project Background

This project is located in a high-end manufacturing park in Qiantang District, Hangzhou, and the owner is a key industrial enterprise in the region. The factory has a large rooftop area, but the structure is complex with multiple orientations and significant localized shading. Conventional string inverter solutions suffer from high power generation losses and increased safety risks. The project requires a safe, reliable, and easy-to-maintain system that does not affect production while maximizing power generation revenue. Ultimately, an all-microinverter solution was selected to create a demonstration commercial and industrial PV project in Qiantang District.

Project Difficulties and Challenges

• Complex rooftop structure with multiple orientations and susceptibility to partial shading (from factory equipment, flues, parapet walls)
• Extremely high requirements from the owner for electrical safety, easy operation and maintenance, and long-term reliability
• Need to avoid damaging the roof waterproofing, ensure a short construction period, and not affect normal factory operations
• Qiantang District experiences frequent rain, fog, and low-light conditions, requiring excellent low-light power generation performance.

Core Technical Solution (Microinverter Advantages)

• Module-level independent MPPT: Each module is paired with one JPM-2000 microinverter, completely eliminating the "short-board effect" and increasing power generation by 12%~18% on complex rooftops.
• Ultimate safety (DC ≤60V): No risk of DC high-voltage arcing, eliminating shock hazards at the source, and complying with building and fire safety standards.
• Flexible adaptation to complex roofs: Supports mixed installation of modules with different tilt angles, orientations, and power ratings, enabling 100% utilization of available roof area.
• Smart O&M (module-level monitoring): Remote real-time monitoring of power generation data for each module, precise fault location and online diagnosis, without requiring system shutdown for maintenance.
• Plug-and-play, modular construction: No centralized inverter room, simple wiring, short construction period – grid connection achieved in 45 days with minimal impact on production.

Project Outcomes

• Power generation revenue: Annual power generation of approximately 680,000 kWh, saving about 550,000 RMB in electricity costs per year.
• Safety and reliability: Zero high-voltage hazards, zero fire risk, successfully passed acceptance inspections by State Grid and fire authorities.
• O&M costs: Reduced by over 60% compared with conventional string inverter solutions, with a system lifespan of up to 25 years.
• Environmental benefits: Annual CO₂ reduction of approximately 677 tons, equivalent to planting 37,000 trees.
• Return on investment: Payback period of 5–6 years, with stable returns throughout the 25-year life cycle.

Project Highlights and Significance

This project serves as a demonstration of commercial and industrial microinverter application in Qiantang District, validating the outstanding performance of microinverters on complex factory rooftops, under high safety requirements, and in low-light climatic conditions. The key highlights are as follows:

• Excellent low-light performance, well-suited to Hangzhou's rainy and foggy climate, ensuring more stable power generation throughout the year.
• Convenient modular expansion – the system can be easily scaled up to 1MW+ in the future, compatible with integrated PV-storage-charging solutions.
• Equipped with a smart energy management platform, enabling data visualization of power generation, carbon reduction, and revenue, making O&M more efficient.

The project provides a safe, efficient, and replicable mature solution for commercial and industrial distributed PV in the Yangtze River Delta region, helping enterprises achieve energy savings, cost reduction, and green transformation, while promoting high-quality development of the regional new energy industry.