Description
New product. Solar King SLK-4000 photovoltaic inverter, model SLK-4000, identified on the nameplate as PV Grid Inverter. It is a single-phase ON-GRID / Grid-Tie inverter designed to convert DC energy from the photovoltaic field into 230 V AC energy to be fed into the electrical grid. The model features 1 MPPT and a nominal power of 4,000 W, with maximum power of 4,400 W.
⚙️ Technical Specifications
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Type: ON-GRID / Grid-Tie
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Phasing: Single-phase
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Power: 4.0 kW
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Maximum Power: 4.4 kW
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MPPT: 1
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DC Voltage: 150–500 V DC – MPPT range
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DC Nominal Voltage: 360 V DC
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DC Max Voltage: 500 V DC
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DC Working Voltage: 100–500 V DC
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DC Max Current: 20 A
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AC Voltage: 230 V AC
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Frequency: 50 Hz on the photographed nameplate; the series documentation indicates 50/60 Hz compatibility with automatic selection.
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AC Max Current: 20 A
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PV Inputs: up to 3 strings
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Protection Rating: IP65
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Operating Temperature: −25…+55 °C
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Cooling: natural convection
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Dimensions: approx. 550 × 300 × 133 mm
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Weight: approx. 21 kg
⚡ Function in the Photovoltaic System
The Solar King SLK-4000 is a grid-connected inverter: it receives direct current from the photovoltaic modules, tracks the maximum power point through MPPT, and converts the energy into 230 V AC single-phase synchronized with the grid. It is not a hybrid inverter and is not designed for off-grid operation with batteries.
🔌 PV Input and MPPT
The device features 1 MPPT tracker. The indicated nominal DC voltage is 360 V, with 100–500 V DC as the operating range and 150–500 V DC as the MPPT range. The maximum permitted open-circuit voltage is 500 V DC. The maximum input current indicated on the nameplate of the unit is 20 A. The series documentation also indicates up to 3 PV inputs/strings.
🏭 Construction and Installation
The model features an IP65 enclosure, an integrated DC isolator, and natural cooling. The dimensions of the SLK-4000 version are approximately 550 × 300 × 133 mm, with a weight of around 21 kg. The series uses communication interfaces for configuration and monitoring and features protection functions for grid connection.
⚠️ Main Faults and Diagnostics
The faults documented for the SLK series include:
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PV/DC Overvoltage above the permitted limit;
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DC Bus High / DC Bus Low, internal bus voltage fault;
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absence or fault of the AC grid;
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device fault;
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internal overtemperature;
- faults related to the conversion circuit or internal control.
🛡️ Safety and Product Condition
New product, as indicated for the listing. The inverter can operate with voltages up to 500 V DC and 230 V AC; any testing, connection, or intervention must be carried out by qualified personnel.
📦 Package Contents
1 × Solar King SLK-4000 – 4 kW photovoltaic inverter, as shown in the photographs.
🚀 Final Description
Solar King SLK-4000, 4 kW single-phase ON-GRID / Grid-Tie photovoltaic inverter, with 1 MPPT, 360 V nominal DC voltage, 100–500 V DC operating range, 150–500 V DC MPPT range, 500 V maximum DC voltage, 20 A maximum DC current, and 230 V AC output. Nominal power 4,000 W, maximum power 4,400 W, maximum AC current 20 A, up to 3 PV strings, IP65 protection, natural cooling, and integrated DC isolator. It is an inverter intended for grid connection, not a hybrid or off-grid system.
