IP65 Outdoor Waterproof and Dustproof Combiner Box for Solar Power Generation System

Driven by the global energy transition and carbon neutrality goals, solar power systems are penetrating into distributed rooftops, large-scale ground power stations and emerging balcony micro-light storage scenarios at an annual growth rate of over 20%. As the ‘nerve centre’ of the PV system, the performance of the convergence box directly determines the power station's power generation efficiency, operation and maintenance costs and safety life. Recently, an outdoor waterproof and dustproof convergence box with IP65 protection level has attracted attention at SNEC PV+ 2025 International Photovoltaic Exhibition, and it has become a benchmark case for the industry's technological upgrading with its full-scene adaptability, multiple safety protection and intelligent operation and maintenance functions.

IP65 Protection: Cracking the Challenges of Extreme Outdoor Environments 
Traditional convergence boxes have long faced the erosion of complex climates such as high desert temperatures, coastal salt spray, and plateau tundra, resulting in high equipment failure rates. The PVB-16 series of PVB on display adopts a fully sealed cast aluminium shell and IP65 protection design, which can completely isolate dust intrusion and maintain normal operation even after being immersed in 1m deep water for 30 minutes. Its internal structure optimises the layout of air ducts and radiators to ensure the long-term stable operation of desert power stations, even when operating at high temperatures of 55℃.

‘In a 500MW photovoltaic project in Saudi Arabia, the annual failure rate of traditional convergence boxes due to salt spray corrosion reached 8%, while the adoption of the IP65-protected PVB-16 series reduced the failure rate to 0.3%, and the O&M cost was reduced by 60%.’

16-channel high-current convergence: adapting to the era of high-power modules 
With the popularity of high-power modules, the current of single-string PV modules has exceeded 20A, and the traditional 4-8-channel convergence box is difficult to meet the demand. PVB-16 series supports 16-channel PV arrays in parallel, with a single-channel rated current of 20A, a total output current of up to 400A, and a voltage rating of 1,000VDC, which perfectly matches the large-size modules and the string inverters. string inverters, increasing the system power generation efficiency by more than 30%.

‘In a ground power station in Qinghai, this series of convergence boxes optimises the structure of the power station by reducing the number of inverter access cables and at the same time reduces the loss on the DC side.’ Experts from the China Photovoltaic Industry Association pointed out.

Five-fold safety protection: building full life cycle protection 
millisecond short circuit protection: each input is independently configured with high-voltage fuse and anti-reverse diode, which can cut off the faulty circuit within 0.1 milliseconds, avoiding the hot spot effect of the module.
Lightning defence system: Built-in PV-specific lightning protection module (SPD), together with the grounding system can withstand 40kA lightning impact.
Intelligent circuit breaker control: adopts domestic famous brand DC circuit breaker, supports remote switching operation, and improves operation and maintenance efficiency by 50%.
Environmental awareness and early warning: integrated temperature, irradiation, wind speed sensors, real-time monitoring of the operating status of the equipment, and upload data to the monitoring platform through the RS485 interface (optional).
Fire-retardant design: the box body adopts V-0 grade fire-retardant materials, and the internal electrical clearance and creepage distance meets the 1000V system requirements.
Intelligent operation and maintenance: from ‘passive maintenance’ to ‘active prevention’ 
This series of convergence box is equipped with intelligent monitoring unit, which can display the input current, voltage and power of each circuit locally and support Modbus-RTU protocol to communicate with the host computer. Operation and maintenance personnel can remotely view the status of the equipment through mobile phone APP, and the system automatically generates fault warning reports. For example, when a certain input current drops abnormally, the platform will immediately push the ‘component blocking or damage’ alarm to guide the site to quickly investigate.

‘In an industrial and commercial distributed project in Jiangsu, the intelligent O&M function shortened the fault response time from 4 hours to 15 minutes, reducing the annual power outage time by 80%.’

Market outlook: full-scene penetration from large power plants to balcony micro-storage 
With the rise of micro-photovoltaic storage systems, there is a surge in demand for miniaturised, highly integrated convergence boxes. While maintaining IP65 protection, it reduces the size by 35%, supports micro-reverse access and virtual power plant scheduling, and has passed European CE certification. The convergence box, meter box and Energy Storage System integrated into one, to meet the ‘plug and play’ needs of home users. According to industry forecasts, by 2026, the global PV convergence box market size will exceed 5 billion yuan.