Low-Voltage PV Grid-Connection Box

Product Overview

The low-voltage PV grid-connection box (PV grid-connection box for short) is a core supporting device for distributed photovoltaic power generation systems, specifically designed for scenarios such as residential PV, commercial and industrial distributed PV, and agricultural PV. It is suitable for AC 50/60Hz, rated voltage 220/380V low-voltage distribution systems. As a key connection hub between photovoltaic inverters and the public grid, it integrates grid-connection control, energy metering, safety protection, and intelligent monitoring. It is responsible for efficiently and safely feeding electricity generated by the PV system into the grid, while enabling functions such as power data monitoring and abnormal event alarming. It is an essential device for compliant grid-connection and stable operation of PV power generation projects.

This product relies on advanced intelligent control technology, optimizes internal structural design, and balances safety and practicality. It can precisely match PV systems of different power levels and is compatible with first-tier PV modules such as LONGi and Trina, as well as inverters such as Huawei and Sungrow. It effectively solves problems related to energy metering, safety protection, and remote operation and maintenance during PV grid-connection. It is widely used in various low-voltage PV project scenarios such as rural self-built houses, villas, factory buildings, industrial parks, and agricultural PV demonstration zones.

The product strictly complies with national and industry standards such as GB/T 34129-2017 "Special low-voltage distribution device for distributed photovoltaic power generation" and GB 7251 "Low-voltage switchgear assemblies", and has passed CCC certification. It has passed type tests at China Electric Power Research Institute, is safe, reliable, and operates stably, fully meeting the grid companies' "anti-islanding + power quality + remote control" three-in-one grid-connection requirements. It is suitable for long-term use in complex outdoor operating environments.

Operating Environment

1.  Ambient temperature: -30℃ to +55℃, 24h average temperature ≤ +35℃, suitable for outdoor temperature differences in different regions, accommodating both high-temperature sunlight and low-temperature严寒 scenarios.

2.  Altitude: ≤ 2500m, meeting grid-connection needs for PV projects in high-altitude areas.

3.  Relative humidity: ≤95%, with anti-condensation design, adaptable to humid and rainy environments, preventing internal components from moisture damage.

4.  Pollution degree: Level 3, effectively resisting outdoor dust, debris, salt spray, and other pollutants, suitable for special scenarios such as coastal areas and industrial parks.

5.  Installation inclination: ≤5°, can be stably installed on walls, brackets, or the ground, adapting to conventional installation layouts for PV systems.

6.  Environment: Outdoor/semi-outdoor installation, resistant to mild vibration, no corrosive gases, no conductive dust, no flammable or explosive hazards. Features specialized lightning protection, rainproofing, and dustproofing designs, with protection performance tailored to outdoor PV scenario requirements.

Technical Parameters

Product Features

1. Integrated Grid-Connection Design, Convenient and Efficient
Integrates grid-connection control, energy metering, safety protection, and intelligent monitoring into one unit. No additional auxiliary equipment is required, simplifying the PV grid-connection system structure and reducing installation costs and construction difficulty. Pre-wired design eliminates the need for secondary drilling on site, significantly improving PV project grid-connection efficiency. Adapts to both residential and commercial/industrial scenarios.

2. Comprehensive Safety Protection, Compliant Grid-Connection
Built-in multiple protection functions including anti-islanding device (active impedance measurement + passive parameter monitoring, response ≤0.5s), surge protection device, overcurrent, overvoltage, undervoltage, leakage, and reverse power protection. Quickly responds, effectively preventing reverse power transmission from the PV system to a de-energized grid and avoiding power accidents. Fully complies with State Grid grid-connection specifications.

3. Intelligent Monitoring and Maintenance, Unattended Operation
Equipped with a microcomputer intelligent monitoring module that collects grid-connection power parameters (voltage, current, power, power generation, etc.) in real time. Supports uploading 21 power quality parameters and features SOE event recording (storage ≥ 5000 entries). Supports remote communication, allowing remote viewing of operating data and fault alarms via mobile APP or computer terminal. Enables unattended operation, significantly reducing operation and maintenance costs.

4. Outdoor-Specific Protection, Durable and Long-Lasting
The enclosure is made of high-quality stainless steel or cold-rolled steel, treated with phosphating and electrostatic spray coating, providing corrosion resistance, rust prevention, rainproofing, and dustproofing. Protection level can reach IP65 or above. Sealed design with high-quality waterproof sealing strips and fasteners withstands harsh outdoor environments. Service life exceeds 15 years, suitable for complex climate scenarios such as rainy, high-humidity, and salt spray conditions.

5. Precise Metering, Anti-Tampering Design
Independent metering compartment design compliant with GB/T17215 standards. Equipped with dedicated metering CTs (0.2S class) and voltage loss/current interruption monitoring modules. Dual metering channel design (one 0.5-class electronic energy meter for forward and one for reverse). Supports DL/T645-2007 protocol. Triple lead seal protection provides significant anti-tampering effect. Data storage period ≥ 7 years, meeting grid metering requirements.

6. Modular Design, Flexible Adaptation
Modular structure allows flexible configuration of metering, protection, communication, and other functional modules based on PV system power and grid-connection method (single-phase/three-phase). Supports later expansion and upgrades. Adapts to various PV projects from 10kW to 10MW. Compatible with different brands of inverters and PV modules, offering strong versatility.

7. Automatic Reclosing, Suitable for Unattended Scenarios
Features automatic reclosing function. After grid power outage and breaker trip, automatic reclosing occurs after a 10-180s delay (programmable), performing up to five reclosing cycles without manual operation. Particularly suitable for PV scenarios where project sites are remote and no maintenance personnel are on duty, improving system operation continuity.

Core Values

1.Builds a safe connection bridge between PV systems and the grid, ensuring compliant grid-connection and stable operation, helping PV projects successfully pass grid acceptance.

2. Precisely measures power generation, providing reliable data support for electricity billing and subsidy claims, eliminating metering errors and anti-tampering risks.

3.Multiple safety protections prevent hazards such as islanding effect, overvoltage, and overcurrent, ensuring the safety of PV systems, grid equipment, and personnel.

4.  Intelligent remote operation and maintenance reduce manual inspection costs, enable timely detection and handling of operational anomalies, and improve PV system power generation efficiency.

5.Outdoor-specific protection design adapts to complex climate environments, extends equipment service life, and reduces later maintenance costs.

6. Modular flexible configuration adapts to PV projects of different scales, supporting new energy transformation, achieving energy savings, consumption reduction, and green power generation.

Our Advantages

1.  Fast selection and quotation. Familiar with PV grid-connection policies in different regions. Provide customized grid-connection solution designs, precisely matching scenario requirements.

2.  Standardized production using first-tier brand components such as CHINT and Delixi. Advanced production processes. Fastest delivery in 20 working days, ensuring PV project construction schedules.

3.  Full technical support: grid-connection commissioning, installation guidance, operation and maintenance training, and rapid after-sales maintenance. Assist in grid company acceptance. One-stop service saves time and effort.

4.  Passed CCC, ISO9001 and other authoritative certifications. Passed type tests at China Electric Power Research Institute. Hold multiple patented technologies. Product quality guaranteed.

5.  Localized warehousing layout for timely emergency replenishment. Cabinet size, protection level, and functional modules can be customized according to user requirements, providing strong adaptability.

Ordering Guidelines

Please provide the following information when ordering:

1.  PV system power, rated voltage (220V/380V), and grid-connection method (single-phase/three-phase)

2.  Metering accuracy requirements, communication method (5G module required or not), and remote monitoring requirements

3.  Installation method (wall-mounted/bracket-mounted/floor-standing), protection level requirements, and cabinet size requirements

4.  Usage environment (high altitude, high humidity, strong salt spray, etc.) and special protection function requirements

5.  Whether anti-islanding device, reactors, or other additional components are required, and other customization requirements