QIT100-1
Three-phase 100kW interface panel for 1 inverter, compliant with the Italian CEI 0-21 grid standard and CEI EN 61439-1/2. IP65 class II protection, supplied with a certified SPI test report and Di.co declaration of conformity included. Ideal for industrial and commercial photovoltaic systems with LV grid connection and rated power up to 100kW.
The QIT100-1 is the Secsun three-phase 100kW interface panel for 1 inverter, designed for photovoltaic systems that require full compliance with the Italian CEI 0-21 grid standard. Mandatory for systems above 11.08 kW connected to the LV grid, it includes the Interface Protection System (SPI) with a CEI 0-21-compliant relay and a certified test report, essential documents for the connection application with the local grid operator.
Why is the interface panel mandatory?
The CEI 0-21 standard requires a certified interface device (DDI) and an Interface Protection System (SPI) for all LV photovoltaic systems above 11.08 kW. The panel guarantees automatic disconnection of the system from the grid in the event of voltage or frequency anomalies, protecting both the system and the operator's grid. The SPI test report, performed on the bench by the manufacturer, is the document required by the grid operator to authorise the connection.
QIT100-1 technical specifications
| Rated power | 100 kWp |
| Number of three-phase inverters | 1 |
| Main isolator switch | 4x160A with 230V shunt trip coil |
| Inverter protection (IMD) | 4x160A 16kA adjustable |
| DDI contactor | 4P 160A AC-3 (interface device) |
| Surge arrester | Three-phase class II, Imax 20kA |
| Interface relay | CEI 0-21 compliant (SPI) |
| Protection rating | IP65 class II |
| Certification | CEI EN 61439-1/2 |
| Dimensions (WxHxD) | 705 x 1095 x 230 mm |
| Weight | 80 kg |
| Terminal block | Numbered cable input/output |
When is the interface panel required?
The CEI 0-21 interface panel is mandatory for any photovoltaic system above 11.08 kW connected to the LV grid of the local operator. For 100 kWp systems with a single three-phase inverter, the QIT100-1 provides the protection required by the standard and the complete documentation for the grid application. It is used in industrial, agricultural and commercial installations.
What is included in the supply?
- Wired and tested electrical panel, ready for installation
- Certified CEI 0-21 SPI test report (bench-tested — required by the grid operator)
- Declaration of conformity CEI EN 61439-1/2 (Di.co)
- Single-line diagram of the panel
- Numbered input/output terminal block for easy field wiring
Frequently asked questions
Is the QIT100-1 supplied already wired and tested?
Yes. The QIT100-1 is delivered fully wired, assembled and factory-tested. The SPI test report is performed on the bench before shipping, so the panel is immediately installable without further calibration or on-site testing.
What is the SPI test report and why is it essential?
The SPI (Interface Protection System) test report is the document certifying the correct operation of the interface relay according to the CEI 0-21 standard. It is required to obtain connection approval from the local grid operator and to complete the application for systems above 11.08 kW. Without this document the system commissioning cannot be finalised.
Is the QIT100-1 compatible with any 100kW three-phase inverter?
Yes. The QIT100-1 works with any 100kW three-phase inverter of any brand (Huawei SUN2000, SolarEdge, SMA Sunny Tripower, Sungrow, Fronius, etc.). The inverter protection is a 4x160A 16kA adjustable IMD, sized for the maximum current of 100kW LV three-phase inverters.
What documents are needed for the grid application with the QIT100-1?
For the grid operator application the following are normally required: a CEI 0-21-compliant SPI test report (included), a CEI EN 61439-1/2 declaration of conformity (included), the single-line diagram of the panel (included) and the inverter declaration of conformity. The QIT100-1 already includes all the panel-specific documents.
What is the difference between the QIT100-1 and the QIT100-2?
The main difference is the number of inverters: the QIT100-1 is set up for 1 three-phase 100kW inverter, while the QIT100-2 manages 2 three-phase inverters (typically 2 x 50kW). The QIT100-2 is larger (955x1095x230mm vs 705x1095x230mm). For a single 100kW inverter the QIT100-1 is sufficient; for redundancy with 2 x 50kW inverters the QIT100-2 is required.
