Three-phase AC panel with SPI - 2 x 33 kW inverters (total 66 kW) with CEI 0-21 interface

66 kW Three-Phase Photovoltaic AC Panel with SPI and CEI 0-21 Interface Device for 2 x 33 kW Inverters

The 66 kW three-phase photovoltaic AC panel with an interface protection system (SPI) and a CEI 0-21 compliant interface device is an electrical panel designed for the management, protection, and control of the AC side in photovoltaic systems connected to the low-voltage electrical grid.

The electrical panel is configured to manage two 33 kW three-phase photovoltaic inverters for a total system power of 66 kW. It incorporates protection, isolation, and control devices designed to ensure the correct coordination of protections between the inverters, distribution line, and electrical grid in accordance with Italian technical regulations for the connection of power generation systems.

This AC panel for photovoltaic systems enables the safe connection of inverters to the grid, ensuring compliance with the requirements set out in the CEI 0-21 standard for connecting power generation systems to the low-voltage electrical grid.

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Function of the AC Panel in Photovoltaic Systems

The photovoltaic AC electrical panel represents the interface between the system's inverters and the electrical distribution grid. Its function is to manage the AC side of the system, ensuring electrical safety, continuity of operation, and equipment protection.

The interface protection system constantly monitors the main electrical grid parameters, such as:

• grid voltage
• frequency
• phase balance
• line operating conditions

If anomalies or parameters outside the limits set by the regulations are detected, the system automatically intervenes by disconnecting the photovoltaic system from the electrical grid to ensure the safety of the system and the grid.

The AC panel also enables the coordination of electrical protections between the inverters and the distribution grid, reducing the risk of faults and improving the stability of the power generation system.

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Main Features of the 66 kW Photovoltaic AC Panel

• AC-side management of two 33 kW three-phase inverters
• Total photovoltaic system power up to 66 kW
• SPI interface protection system compliant with the CEI 0-21 standard
• Interface device for connection to the low-voltage electrical grid
• Type 2 SPD + CT for overvoltage protection
• Magnetothermal and residual current protection for electrical lines
• Interface contactor for automatic line isolation
• Industrial enclosure with IP55 protection rating
• System status indication via front-mounted LED indicators
• Integrated service socket for maintenance

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Applications of the Three-Phase Photovoltaic AC Panel

• Medium-power commercial and industrial photovoltaic systems
• Photovoltaic systems installed on industrial warehouses
• Installations on production buildings and commercial facilities
• Systems with multiple three-phase inverters connected in parallel
• Photovoltaic systems connected to the low-voltage grid in accordance with CEI 0-21
• Renewable energy power generation systems

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Components Included in the AC Electrical Panel

• 1 IP55 industrial enclosure, dimensions 127 × 82 × 30 cm
• 1 4-pole 125 A 10 kA Type C magnetothermal circuit breaker
• 1 230 Vac current-release switch
• 1 Type 2 modular SPD + CT 40 kA 3P+N 420 Vac
• 3 modular 115–230 V red LED indicators
• 2 1P+N 6 A 30 mA 10 kA Type C magnetothermal residual current circuit breakers
• 1 1P+N 16 A 30 mA 10 kA Type C magnetothermal residual current circuit breaker
• 1 16 A 250 Vac Schuko modular socket
• 1 4-pole 95 A AC1 contactor
• 2 4-pole 63 A Type C 10 kA magnetothermal circuit breakers
• 2 stackable 4-pole 50/63 A Idn 300 mA Type A residual current blocks
• 1 CEI 0-21 compliant interface device with a buffer time exceeding 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	2 x 33 kW three-phase inverters
System rated power	66 kW
Connection standard	CEI 0-21
Overvoltage protection	Type 2 SPD + CT 40 kA
Enclosure protection rating	IP55
Panel dimensions	127 × 82 × 30 cm

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Installation of the AC Electrical Panel for Photovoltaic Systems

The AC electrical panel is designed for installation in technical rooms, power generation plants, and industrial environments dedicated to the management of photovoltaic systems.

The IP55-rated enclosure protects electrical components against dust and moisture, ensuring operational reliability even in industrial environments.

The panel configuration must be verified by the system designer or a qualified installer, depending on the system's power and the characteristics of the electrical grid.

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Frequently Asked Questions about the Photovoltaic AC Panel

What is the SPI system in photovoltaic systems?

The interface protection system is a device that monitors electrical grid parameters such as voltage and frequency and automatically disconnects the photovoltaic system when the values exceed the limits set by the regulations.

For which systems is this AC panel designed?

The AC panel is designed for photovoltaic systems with two 33 kW three-phase inverters for a total power of 66 kW connected to the low-voltage electrical grid.

What does the CEI 0-21 standard establish?

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

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Related search terms

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