Photovoltaic Grid Connected Cabinet

✅Efficient Power Generation & Energy Saving
✅Multi-layer Safety Protection
✅Intelligent Monitoring & Management
✅Modular Design & Flexibility
✅High Integration & Excellent Compatibility

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Product Introduction

Photovoltaic Grid Connected Cabinet, also known as a PV Grid-Connected Distribution Box or AC Distribution Cabinet, is the critical interface equipment connecting a photovoltaic power generation system to the public 400V grid. It is installed between the AC output side of the PV inverter and the power grid,ensures the safe, reliable, and standards-compliant grid-connected operation of the power station.

Simply put, its core task is: to safely feed the electricity generated by the PV system into the grid while protecting equipment and personnel.

Working Principle

PV Modules (DC) → Inverter (converts to AC) → PV Grid-Connected Cabinet→ Public Grid / User Load
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Executes Protection, Metering, Connection/Disconnection

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1. The inverter converts DC power into AC power that matches the grid's voltage, frequency, and phase.

2. Electricity enters the grid-connected cabinet, first passing through the incoming circuit breaker.

3. The energy meter begins recording generation, and the protection relay continuously monitors grid parameters.

4. If all conditions are normal (voltage and frequency within range, no islanding detected), the grid-connected circuit breaker remains closed, feeding electricity into the grid through the isolating switch.

5. If the protection relay detects any abnormality (grid power loss, voltage anomaly), it immediately (within milliseconds) sends a stop command to the inverter and trips the grid-connected circuit breaker, achieving safe isolation.

Product Component

● Circuit Breakers and Disconnecting Switches

● Anti-Islanding Protection Devices: Quickly disconnect from the grid during a power outage to prevent islanding effects.

● Power Metering Devices: Support bidirectional metering with an accuracy of up to 0.5 class

● Lightning Arresters and Surge Protectors

● Current/Voltage Transformers

● Communication Modules: Support RS485, Ethernet, 4G, etc., enabling remote monitoring and data acquisition.

● Cabinet Structure: Constructed with 2mm cold-rolled steel plate, IP54~IP65, suitable for harsh outdoor environments.

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Technical Parameters(typical)

Item	Parameter Value
Rated Voltage	AC 400V
Rated Frequency	50Hz
Ingress Protection Rating	IP54 ~ IP65 (Outdoor Type)
Short-Circuit Making Current	40kA ~ 50kA
Metering Accuracy	Class 0.5 Bidirectional Meter
Operating Temperature	-20℃ ~ +50℃ (Some models support -25℃~+65℃)
Communication Protocol	Modbus RTU, IEC61850, etc.

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Core Features and Advantages

Core Feature	Description
High-Efficiency Power Generation & Energy Saving	Utilizes advanced inverter technology to ensure high conversion efficiency and minimizes transformer and line losses through a 0.4kV direct connection design, maximizing power generation revenue.
Multi-Layered Safety Protection	Provides a comprehensive four-fold protection system covering electrical (Class IV lightning protection), environmental (IP65 enclosure), insulation (high withstand voltage), and data security, ensuring the safety of both the system and equipment.
Intelligent Monitoring & Management	Supports real-time monitoring of power quality and equipment status, and enables remote operation and maintenance as well as intelligent regulation via mobile apps or platforms to optimize operational efficiency.
Modular Design & Flexibility	Employs a modular and integrated design that supports flexible configuration of multiple input circuits, facilitating installation, maintenance, and future system expansion.
High Integration & Excellent Compatibility	Highly integrates multiple functions such as combining, protection, metering, and communication into a compact cabinet body, and is compatible with equipment from different brands, reducing investment costs and footprint.