Three-phase AC panel with RCD - 40A

20 kW Three-Phase Photovoltaic AC Panel with SPI and CEI 0-21 Interface Device for 20 kW Inverter

The 20 kW three-phase photovoltaic AC panel with an interface protection system (SPI) and an interface device compliant with the CEI 0-21 standard is an electrical panel designed for the management, protection, and control of the alternating current (AC) side in photovoltaic systems connected to the low-voltage distribution grid.

The electrical panel is configured to manage a 20 kW three-phase photovoltaic inverter. It integrates electrical protection, isolation, and control systems designed to ensure the coordination of protections between the inverter, distribution line, and electrical grid in compliance with Italian technical standards for the connection of energy production systems.

This AC panel for photovoltaic systems enables the safe connection of the inverter to the electrical grid, ensuring compliance with the technical requirements set out in the CEI 0-21 standard for the connection of production systems to the low-voltage distribution grid.

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Function of the AC Panel in Photovoltaic Systems

The photovoltaic AC electrical panel represents the interface between the photovoltaic inverter and the electrical grid. Its main function is to manage the alternating current side of the system, ensuring electrical safety, operational continuity, and component protection.

The interface protection system (SPI) constantly monitors electrical grid parameters such as:

• electrical grid voltage
• grid frequency
• phase imbalances
• electrical line operating conditions

In the event of anomalies or conditions that do not comply with the limits set out in the standard, the system automatically disconnects the photovoltaic system from the grid to ensure the safety of the system and electrical components.

In photovoltaic systems, the AC panel also enables the coordination of protections between the inverter and the electrical grid, reducing the risk of faults and improving the overall reliability of the energy production system.

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Main Features of the 20 kW Photovoltaic AC Panel

• Management of the alternating current side of a 20 kW three-phase photovoltaic inverter
• AC panel configuration for photovoltaic systems connected to the low-voltage grid
• SPI interface protection system compliant with the CEI 0-21 standard
• Interface device for controlling the connection to the electrical grid
• Magnetothermal protection of the inverter line
• Residual current block for protection against leakage currents
• Type 2 SPD surge arrester for protection against atmospheric overvoltages
• Interface contactor for automatic line isolation
• Wall-mounted ABS enclosure with IP65 protection rating
• Provision for wiring and quick connection of input and output cables

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Applications of the Three-Phase Photovoltaic AC Panel

• Small and medium-sized residential and commercial photovoltaic systems
• Photovoltaic systems installed on residential and industrial buildings
• Photovoltaic installations on residential and warehouse roofs
• Photovoltaic systems with a single three-phase inverter
• Renewable energy production systems connected to the low-voltage grid

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Components Included in the AC Electrical Panel

• Wall-mounted ABS enclosure with IP65 protection rating
• 18 + 18 + 18 module configuration for installing electrical components
• 2 4-pole 40A Type C magnetothermal circuit breakers
• 1 4-pole 300mA Type A residual current block
• 1 Type 2 3P+N 40kA 420Vac SPD surge arrester
• 1 4-pole 40A contactor with 230Vac coil
• Fuse holder with gG fuses, size 10.3 × 38
• Input and output terminals for line connection
• Grounding bar for equipotential connection
• Internal wiring and provision for quick installation
• Cable glands and component labeling
• SPI interface compliant with the CEI 0-21 standard with buffered power supply for more than 5 seconds

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Technical Specifications of the Photovoltaic AC Panel

Panel type	Three-phase photovoltaic AC electrical panel with SPI interface protection
Inverter configuration	1 20 kW three-phase inverter
Rated current	40A
Rated voltage	400 Vac
Connection standard	CEI 0-21
Overvoltage protection	Type 2 40kA 3P+N SPD
Protection rating	IP65
Installation	Wall-mounted ABS enclosure

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Installation of the AC Electrical Panel for Photovoltaic Systems

The AC electrical panel is designed for wall mounting in technical environments or outdoors, thanks to its ABS enclosure with an IP65 protection rating, which ensures protection against dust and weather conditions.

The panel is supplied with cable glands, connection terminals, and accessories to facilitate the wiring and installation of the photovoltaic system.

The panel must be connected by a qualified electrical installer in compliance with technical standards and the requirements of the distribution grid operator.

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Frequently Asked Questions About the Photovoltaic AC Panel

What is the SPI system in photovoltaic systems?

The interface protection system (SPI) is a safety device that monitors the electrical grid's voltage and frequency and automatically disconnects the photovoltaic system in the event of anomalies or conditions that do not comply with the limits set out in the standard.

For which systems is this AC panel designed?

The AC panel is designed for photovoltaic systems with 20 kW three-phase inverters connected to the low-voltage distribution grid in compliance with the CEI 0-21 standard.

What does the CEI 0-21 standard establish?

The CEI 0-21 standard defines the technical rules for connecting electrical energy production systems to the low-voltage distribution grid, establishing safety, protection, and interface management requirements between the system and the grid.

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Related search terms

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