This document describes the SAJ M2 Series Micro-inverter, a device designed for grid-tied photovoltaic applications. The manual provides comprehensive instructions for installation, operation, maintenance, troubleshooting, and safety.
Function Description
The SAJ M2 Series Micro-inverter converts DC electricity generated by solar panels into AC electricity that meets the requirements of the public grid. This AC electricity is then fed into the grid, helping to reduce the load pressure on the grid. The system typically comprises the M2-(1.8K-2.25K)-S4 Micro-inverter itself and a monitoring and analysis system. The product model nomenclature indicates its key features: "M2" for the product name, "XK" for the rated power (e.g., 2.25K for 2.25kW), "S" for single phase, and "4" indicating that a microinverter can connect to four solar panels.
Important Technical Specifications
The M2 Series Micro-inverters come in several models: M2-1.8K-S4, M2-2K-S4, M2-2.2K-S4, and M2-2.25K-S4.
- Recommended PV Module Power (STC) Range: 400~700+ Wp
- Peak Power Tracking Voltage: 35~50 V
- Operating Voltage Range: 16~55 V
- Maximum Input Voltage: 60 V
- Maximum Input Current: 20 x 4 A
- Back-Feed Current: 0 A
- Overvoltage Category: II
Output Data (AC):
- Maximum Output Power (VA):
- M2-1.8K-S4: 1800 VA
- M2-2K-S4: 2000 VA
- M2-2.2K-S4: 2200 VA
- M2-2.25K-S4: 2250 VA
- Nominal Output Current (A):
- M2-1.8K-S4: 7.82 A
- M2-2K-S4: 8.7 A
- M2-2.2K-S4: 9.56 A
- M2-2.25K-S4: 9.78 A
- Rated AC Voltage/Range: L+N+PE, 220, 230, 240/180~280 V
- Rated Output Frequency/Range: 50, 60/45~55, 55~65 Hz
- Power Factor (cos φ): > 0.99 default 0.8 leading ~ 0.8 lagging
- Overvoltage Category: III
- Total Harmonic Distortion (THDi): <3%
- Maximum Units per 10AWG Branch: 4 (for M2-1.8K-S4), 3 (for M2-2K-S4, M2-2.2K-S4, M2-2.25K-S4)
Efficiency:
- Peak Efficiency: 97.00%
- CEC Efficiency: 96.00%
Mechanical Data:
- Operating Temperature Range: -40°C to +60°C (with derating from 45°C to 60°C)
- Communication: Wi-Fi / Bluetooth
- Cooling Method: Natural Convection
- Ambient Humidity: 0-100% non-condensing
- Altitude: 2000m
- Noise: < 20 dBA
- Ingress Protection: IP67
- Dimensions (W x H x D): 33322540 mm
- Weight: 5.8 kg
- Warranty: 12 Years
Applicable Standards: EN62109-1/2, EN61000-6-1/2/3/4, EN50438, EN50549, C10/11, IEC62116, IEC61727, RD1699, CEI 0-16, CEI O-021, AS4777.2, NBR16149, NBR 16150 VDE-AR-N 4015, VDE 0126-1-1, RoHS.
Usage Features
- Installation Flexibility: The micro-inverter can be installed indoors or outdoors and employs natural convection cooling. It can be mounted horizontally on a rail or vertically on a mounting bracket, with the cover facing the solar panels.
- Multi-machine and Single-machine Systems: The manual details connection procedures for both multi-machine systems (multiple micro-inverters connected in series to a distribution board) and single-machine systems.
- AC Side Cable Connection: Instructions are provided for connecting to 120/240V split-phase power grids, 230/400V three-phase WYE power grids, and 127/220V three-phase power grids. Specific tools like an AC trunk connector unlock tool and AC trunk end caps are included in the package for secure connections.
- DC Side Cable Connection: PV modules are installed above the micro-inverters, and their DC output cables are connected to the DC input side of the micro-inverters.
- Commissioning: The device features an LED indicator for status monitoring (Green Solid for working normally, Green Breathing for standby/waiting, Red Flashing 1 for unable to connect, Red Solid for fault, Red Breathing for upgrading, Red & Green Off for not working).
- eSAJ Home App Integration: The eSAJ Home App facilitates both nearby and remote monitoring, supporting Bluetooth, 4G, and Wi-Fi communication. The app allows users to log in, register, configure the inverter (including initialization settings, country, grid compliance, export/generation limitation settings), and create plant profiles to monitor energy statistics and environmental benefits.
- Safety Features: The device includes warnings for dangerous electrical voltage, hot surfaces, and potential damage from improper modifications. It emphasizes that installation and maintenance should only be performed by qualified electricians following national and local standards.
Maintenance Features
- Troubleshooting Guide: The manual includes a comprehensive fault code and troubleshooting section, detailing various errors such as Master Bus Voltage High/Low, Master Islanding Error, Master Adc Sample Error, Frequency Config Error, Master EEPROM Error, Master Temperature High/Low Error, ISO Error, Output Current Dci High, HW/SW Inv Current High, Grid Voltage 10Min High/High/Low, Grid Frequency High/Low, Master No Grid Error, and various PV Voltage/Current High Errors. For each fault, specific troubleshooting steps are provided, often involving disconnecting AC/DC switches, restarting the inverter, checking connections, or contacting SAJ service.
- Regular Checks: Users are advised to check for package damage upon delivery and ensure proper ventilation and installation environment to prolong the inverter's lifespan.
- Disposal Information: The device should not be disposed of as residential waste. It must be disposed of carefully by an approved collection and recycling facility.
- Contact Information: Detailed contact information for technical support, international sales, and domestic sales is provided for assistance with maintenance and other queries.
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