📝 Description
Used product. The SMA Sunny Boy SB 3000-IT is a single-phase ON-GRID / Grid-Tie photovoltaic inverter, designed to convert the direct current generated by photovoltaic modules into 230 V AC to be fed into the electrical grid. The photographed model is identified on the nameplate as SB 3000-IT, with Serial No. 2001739922, and is specifically the IT variant, designed for Italian grid requirements and certified to DK 5940 Ed. 2.2.
⚙️ Technical Specifications
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Brand: SMA Solar Technology AG
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Model: Sunny Boy SB 3000-IT
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Type: ON-GRID / Grid-Tie
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Phasing: Single-phase
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Rated AC power: 2,750 W
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Maximum AC power: 3,000 W
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MPPT: 1 independent MPP tracker
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Maximum number of strings: up to 3 strings in parallel on the single MPP input
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Maximum DC voltage: 600 V
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DC MPPT range: 268–480 V
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Maximum DC current: 12 A
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Nominal AC voltage: 230 V
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AC voltage range: 220–240 V; documented operating range 180–262 V
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Frequency: 50/60 Hz
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Nominal AC current: 12 A according to the unit's nameplate
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Power factor: cos φ = 1
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Protection rating: IP65
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Installation: Outdoor / Indoor
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Operating temperature: −25…+60 °C
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Cooling: natural convection, via rear heatsink
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Topology: with low-frequency transformer
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Display: LCD
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DC connection: SUNCLIX
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Communication: optional RS485
The unit's nameplate directly confirms VDC max 600 V, VDC MPP 268–480 V, IDC max 12 A, VAC nom 230 V, fAC nom 50/60 Hz, PAC nom 2750 W, IAC nom 12 A and cos φ 1, as well as the DK 5940 Ed. 2.2 marking and outdoor designation.
⚡ Function in the Electrical System
ON-GRID photovoltaic system connected to the electrical grid.
The Sunny Boy SB 3000-IT receives direct current from the photovoltaic strings, tracks the maximum power point using MPPT and converts the DC energy into single-phase 230 V AC, synchronized with the grid.
The device integrates monitoring of the main grid and PV generator parameters, together with the protection functions required for grid connection. The SB 3000-IT variant is specifically associated with the Italian DK 5940 certification, with an autotest procedure specified in SMA documentation.
🛡️ Protections and Functions
According to SMA documentation, the model provides:
- DC reverse-polarity protection
- Ground-fault monitoring
- Grid monitoring
- AC-side short-circuit resistance
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DC disconnection via Electronic Solar Switch (ESS), where equipped
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Monitoring of grid voltage and frequency parameters
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Management and diagnostic system via LCD display
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Galvanic isolation via low-frequency transformer.
🏭 Construction and Installation
The inverter features the characteristic red/gray SMA enclosure of the Sunny Boy generation, with a rear aluminum heatsink and natural convection cooling, without a main cooling fan. The IP65 rating allows installation outdoors, provided the manufacturer's specified mounting conditions are respected.
The lower section provides connections for DC (+/−), AC, communication and auxiliary connections. The structure is designed for wall mounting using the dedicated mounting bracket.
📟 Monitoring and Communication
The integrated LCD display allows the operating status and main inverter values to be viewed. The model can also be equipped with an RS485 interface, useful for communication with compatible SMA monitoring and data acquisition systems.
🛡️ Safety and Product Condition
Used product, with signs of use and normal abrasions on the enclosure, visible in the photographs. The front section, display, identification nameplate and connections appear visually intact.
The nameplate clearly identifies the product as SMA Sunny Boy SB 3000-IT, Serial No. 2001739922, with electrical characteristics 600 V DC / 268–480 V MPPT / 12 A DC / 230 V AC / 2750 W / 12 A AC.
The unit is not declared as working unless subjected to an electrical test. Before commissioning, it is necessary to verify insulation, DC input, MPPT operation, grid synchronization, AC output, display and correct operation of the protection functions.
⚠️ The inverter operates with DC voltages up to 600 V and 230 V AC grid voltage. Any internal work or connection must be carried out exclusively by qualified personnel, with the inverter completely isolated and in accordance with SMA procedures.
📦 Package Contents
- 1 × SMA Sunny Boy SB 3000-IT
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Model SB 3000-IT
- Accessories and wiring only if present and visible in the photographs.
🚀 Final Description
The SMA Sunny Boy SB 3000-IT is a 2.75 kW single-phase ON-GRID photovoltaic inverter, with 1 MPPT, PV input up to 600 V DC, MPPT range 268–480 V, maximum DC current 12 A, 230 V AC / 50–60 Hz output and nominal current 12 A. Its IP65 construction, natural convection cooling, LCD display and provision for RS485 communication make it an inverter from the historic Sunny Boy family intended for grid-connected photovoltaic systems. The -IT variant is specifically associated with the Italian DK 5940 Ed. 2.2 standard.
