The device is a photovoltaic inverter designed for converting direct current (DC) from solar panels into alternating current (AC) for grid connection. It is suitable for various residential and commercial solar power systems.
Function Description
The inverter facilitates the conversion of DC power generated by photovoltaic modules into AC power for feeding into the public grid. It incorporates multiple maximum power point (MPP) trackers to optimize energy harvesting from solar panels, even under varying irradiance conditions. The device supports active power control through smart meters, current transformers (CTs), or ripple control signal receivers, allowing for flexible grid integration and compliance with local grid requirements. It also includes inverter demand response modes (DRMS) and an optional Arc-Fault Circuit Interrupter (AFCI) for enhanced safety and grid management. The AFCI function detects and interrupts electrical arcs, preventing potential fire hazards. The inverter features an OLED display and touch buttons for user interaction, allowing users to monitor system status, view error messages, and configure settings. Communication and monitoring capabilities are provided via RS485 and USB-A ports, enabling remote monitoring and data logging.
Important Technical Specifications
The inverter is available in several models, including MID 15-25KTL3-XL2, MID 30-50KTL3-X2, and MID 30-50KTL3-X2-1, with varying power outputs and configurations.
Input Data (DC):
- Max. recommended PV power (for module STC): Ranges from 22.5kW to 75kW depending on the model.
- Max. DC voltage: 1100V for all models.
- Start voltage: 200V.
- Nominal voltage: 360V (MID 15-25KTL3-XL2) or 600V (MID 30-50KTL3-X2, MID 30-50KTL3-X2-1).
- MPP voltage range: 200-850V (MID 15-25KTL3-XL2) or 200-1000V (MID 30-50KTL3-X2, MID 30-50KTL3-X2-1).
- No. of MPP trackers: 4 (MID 15-25KTL3-XL2) or 3-4 (MID 30-50KTL3-X2, MID 30-50KTL3-X2-1).
- No. of PV strings per MPP trackers: 2/2/2/2.
- Max. input current per MPP trackers: 32A3 or 32A4.
- Max. short-circuit current per MPP trackers: 40A3 or 40A4.
- Backfeed current to PV array: 0A.
Output Data (AC):
- AC nominal power: Ranges from 15kW to 50kW depending on the model.
- Max. AC apparent power: Ranges from 16.6kVA to 55.5kVA.
- Nominal AC voltage/range: 127V/220V, 133V/230V (MID 15-25KTL3-XL2) or 230/400V, 340-440V (MID 30-50KTL3-X2, MID 30-50KTL3-X2-1).
- AC grid frequency/range: 50/60 Hz, 45~55Hz/55-65 Hz.
- Max. output current: Ranges from 43.7A to 84.1A.
- AC inrush current: 60A.
- Max. output fault current: 148.8A.
- Max. output overcurrent Protection: 148.8A.
- Power factor (@nominal power): >0.99.
- Adjustable power factor: 0.8Leading...0.8Lagging.
- THDI: <3%.
Efficiency:
- Max. efficiency: 98.8%.
- Euro-eta: 98.5%.
Protection Devices:
- DC reverse-polarity protection, DC switch, DC surge protection (type II OPT), insulation resistance monitoring, AC surge protection (type II OPT), AC short-circuit protection, grid monitoring, anti-islanding protection, residual-current monitoring unit, string fuse protection (NO), string monitoring, AFCI protection (OPT).
General Data:
- Dimensions (W/H/D): 580435230mm.
- Weight: 34kg or 38kg depending on the model.
- Operating temperature range: -25°C to +60°C (>45°C Derating).
- Noise emission (typical): <50dB(A).
- Altitude: 4000m.
- Internal consumption at night: 1W.
- Topology: Transformerless.
- Cooling: Smart air cooling.
- Electronics protection degree: IP66.
- Relative humidity: 0~100%.
- DC connection: H4/MC4(OPT).
- AC connection: Waterproof PG head+OT terminal or quick connect terminal.
- Display: OLED+LED.
- Interfaces: USB/RS485, WIFI/GPRS/4G/RF/LAN (OPT).
Usage Features
The inverter is designed for straightforward installation, with clear instructions for mounting the wall mount and installing the inverter itself. Wiring procedures for AC and DC sides, signal cables, and grounding are detailed to ensure safe and correct setup. The device supports various active power control methods, including smart meters, CTs, and ripple control signal receivers, to meet specific grid requirements. It also offers demand response modes (DRMS) and an optional AFCI for enhanced grid interaction and safety. The OLED display provides real-time operational data, error messages, and allows for configuration adjustments via touch buttons. The device includes a "Function setting" menu for advanced configurations, such as protection voltage levels and communication settings.
Maintenance Features
Maintenance involves regular checks and cleaning to ensure optimal performance and longevity.
- Checking Heat Dissipation: Periodically assess heat dissipation and clean the heat sink if necessary to prevent output power reduction due to high temperatures.
- Cleaning the Inverter: Clean the enclosure lid, display, and LEDs with a wet cloth after turning off AC and DC breakers and allowing the inverter to shut down. Avoid using solvents or abrasives.
- Checking the DC Disconnect: Regularly inspect the DC Disconnect and cables for visible damage or discoloration. Annually, cycle the rotary switch of the DC Disconnect five times to clean contacts and prolong electrical endurance.
- Troubleshooting: The inverter displays error messages on the OLED screen for malfunctions. Users are advised to provide specific information (serial number, model, error message, grid/DC input voltage, problem description, environmental conditions) when contacting support.
- System Error Codes: A comprehensive list of warning and error codes is provided, along with suggested actions for troubleshooting, such as checking wiring, restarting the inverter, or contacting the manufacturer.
- AFCI Operation: In case of an AFCI trip (Error 200), users are instructed to turn off DC and AC switches, perform troubleshooting on the PV system (checking open circuit voltage), and then restart the inverter by turning the DC and AC switches ON.
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