FRP grid connection cabinet

Product Overview

The fiberglass reinforced plastic grid-connection cabinet (also known as SMC photovoltaic grid-connection box/cabinet) is a grid-connection access protection device specifically designed by Changsong Electric Co., Ltd. for distributed photovoltaic power generation systems. Its core function is to safely and compliantly connect the alternating current (AC) power output from photovoltaic inverters to the public power grid, while providing multiple protection mechanisms to ensure the stable operation of both the power grid and the photovoltaic system. The product is molded under high temperature using SMC (glass fiber reinforced unsaturated polyester resin) composite material, featuring characteristics such as full insulation, corrosion resistance, and flame retardancy, which completely resolve issues with traditional metal cabinets, such as susceptibility to rust, the need for grounding, and inadequate insulation performance. It is strictly designed in accordance with national grid-connection standards and is suitable for all-scenario photovoltaic grid-connection requirements, including distributed rooftop power generation, ground-mounted power stations, industrial and commercial rooftops, fishery-photovoltaic complementary systems, and agriculture-photovoltaic complementary systems.

Main product features

1. Advantages of SMC material: fully insulated and highly weather-resistant

• Full insulation performanceThe box body itself is non-conductive, eliminating the need for additional grounding treatment, thereby fundamentally eliminating the risk of electric shock and ensuring the safety of operation and maintenance personnel.
• Corrosion-resistant and aging-resistantIt effectively resists harsh environments such as moisture, salt spray, and acid rain, with an outdoor service life exceeding 30 years and an indoor service life of over 40 years, reducing long-term maintenance costs.
• Flame retardant and self-extinguishingIts combustion performance reaches UL94V-0 level, enabling it to self-extinguish when exposed to fire and prevent the spread of electrical fires.
• Thermal insulation and anti-condensationExcellent thermal insulation performance reduces the temperature difference between the inside and outside of the enclosure, avoiding electrical failures caused by water vapor condensation.

2. Perfect grid connection protection function

• Anti-islanding protectionIt trips automatically during power grid outage to prevent the photovoltaic system from operating in island mode, which could endanger the safety of maintenance personnel.
• Lightning strike protectionBuilt-in surge protector effectively resists lightning overvoltage surges and protects equipment from transient high-voltage damage.
• Over-voltage and under-voltage protection: Monitor grid voltage in real time, automatically disconnect from the grid in case of abnormalities, and automatically close the circuit after voltage recovery to avoid equipment damage.
• Overload and short circuit protectionEquipped with a dedicated circuit breaker to swiftly cut off fault current and ensure the safety of circuits and equipment.
• Leakage protectionDetect leakage current and trip automatically to prevent personal electric shock accidents, complying with civil safety standards.

3. Intelligent Monitoring and Remote Management (Optional)

• The intelligent grid-connected cabinet supports automatic reclosing function, reducing manual intervention and improving operation and maintenance efficiency.
• Operation data is uploaded to the background monitoring system through communication interfaces (such as RS485 and Ethernet) to enable remote control, fault diagnosis, and data analysis.
• It supports real-time monitoring of equipment status via mobile apps or web portals, optimizing the management process of power stations.

4. With a protection grade above IP54, suitable for outdoor environments

• The door panel of the cabinet is embedded with high-elasticity and aging-resistant sealing strips, achieving a protection grade of IP54 or above, effectively preventing dust and water.
• It supports wall mounting or utility pole installation, adapting to various outdoor scenarios such as rooftops, ground surfaces, and mountainous areas.

Detailed product parameters

Scope of application

1. Residential rooftop photovoltaic

As a grid-connected metering box for household photovoltaic power generation, it is installed on the exterior wall of a residence or on a utility pole, meeting safety standards for civil buildings and supporting 2~10kW single-phase grid-connection requirements.

2. Industrial and commercial distributed photovoltaics

Deployed in scenarios such as factory rooftops, logistics parks, and commercial buildings, it provides 10~60kW three-phase grid-connected solutions and supports customized high-power models up to 1MW to meet the needs of large-scale industrial and commercial projects.

3. Village-level photovoltaic poverty alleviation power stations

As standardized grid-connected equipment, it ensures the compliant operation of poverty alleviation projects and enhances the safety and reliability of power stations through functions such as lightning protection and leakage protection.

4. Fisheries-solar and agriculture-solar complementarity

With the excellent corrosion resistance of SMC material, it is suitable for humid and high-salt-mist environments, such as aquaculture farms and agricultural photovoltaic projects, extending the service life of equipment.

Frequently Asked Questions (FAQ)

Q1: What are the differences between fiberglass grid-connected cabinets and traditional metal grid-connected cabinets?

A: Traditional metal enclosures are prone to rusting, require grounding treatment, and have insufficient insulation performance. In contrast, FRP grid-connected cabinets, made of SMC material, offer full insulation, corrosion resistance, and flame retardancy, eliminating the need for grounding, with a longer service life and lower maintenance costs.

Q2: How to choose the appropriate power specification?

A: Single-phase grid-connection boxes are suitable for small residential projects with capacities of 2 to 10 kW; three-phase grid-connection boxes are suitable for industrial and commercial projects with capacities of 10 to 60 kW; models exceeding 60 kW can be customized up to 1 MW. Selection should be determined based on project capacity and the requirements of the power grid company.

Q3: How is the intelligent monitoring function implemented?

A: After selecting the intelligent grid-connection cabinet, data can be uploaded to the background system through built-in communication modules (such as RS485, 4G), supporting remote control, fault alarms, and data analysis to enhance operational and maintenance efficiency.

Q4: What precautions should be taken during installation?

A：

• The box must be installed vertically in a cool and dry place, avoiding direct sunlight;
• The incoming and outgoing cables must be well sealed to prevent rainwater infiltration;
• Non-professionals are prohibited from opening the box privately. Installation and maintenance must be carried out by certified electricians.
• Avoid contact with strong alkalis, oxidizing acids, amines, and ketone solvents.

Q5: What is the product lifespan? How to maintain it?

A: The outdoor service life exceeds 30 years, while the indoor service life reaches over 40 years. For routine maintenance, it is necessary to regularly inspect the enclosure's airtightness, clean dust, and check the status of components such as circuit breakers and surge protectors.