QIT20-2

The QIT20-2 is the three-phase photovoltaic interface panel for 20kW designed for systems with two inverters in parallel. It is legally required for systems over 11.08 kW connected to the LV grid according to CEI 0-21 standard.

Why is an interface panel needed?

The CEI 0-21 standard requires that all photovoltaic systems with a power greater than 11.08 kW be equipped with an external Interface Protection System (SPI). The interface panel ensures the automatic disconnection of the system in case of grid anomalies, protecting people, equipment, and the public distribution network.

QIT20-2 Technical Specifications

• Nominal power: 20 kWp
• Supported inverters: 2 three-phase in parallel
• Main isolator switch: 4x63A
• Shunt trip coil: 230V AC
• 1P+N fuse holder auxiliary circuit protection: 10A fuse
• 3P+N fuse holder relay voltage presence protection: 10A fuse
• 3P+N fuse holder surge arrester protection: 32A fuses
• Class II three-phase surge arrester: Imax 20kA
• DDI 4P contactor (interface device): 40A - AC3
• SPI interface relay: compliant with CEI 0-21
• MCBs + residual current block: 2 x 4x20A 6kA, 300mA class A
• Terminal block: numbered cable input/output
• Protection rating: IP65 class II
• Dimensions: 510 × 720 × 250 mm (W x H x D)
• Certification: Declaration of conformity CEI EN 61439-1/2
• Test Report included

When is the QIT20-2 mandatory?

It is mandatory for all photovoltaic systems connected to the LV grid with a power greater than 11.08 kW. For systems with two three-phase inverters in parallel reaching 20 kWp, the QIT20-2 is the properly sized solution, ready for GSE testing and connection to the local distributor.

What does the Test Report include?

The panel is supplied with a single-line diagram, declaration of conformity (Di.co), and SPI test report, essential documents for the GSME/distributor connection process and for installation verification by the qualified technician.