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This document is a user manual for the Astris 3K/5K/6K grid-tied PV string inverter, designed for photovoltaic (PV) systems. It provides comprehensive information regarding installation, electrical connections, operation, commissioning, maintenance, and troubleshooting. The manual is intended for PV inverter operating personnel and qualified electrical technicians.
The Astris 3K/5K/6K series are single-phase grid-tied PV string inverters that convert DC power generated by PV strings into AC power and feed the power into the power grid. The 3K PV Inverter with Single MPPT (Maximum Power Point Tracking) input receives input from one string of PV panels, while the 5K/6K PV Inverter with Dual MPPT inputs receives input from two strings of PV panels. The inverter includes an EMI filter on both DC and AC sides to reduce electromagnetic interference, and surge protection is supported on the AC side.
The inverter supports three working modes: standby, operating, and shutdown. In standby mode, the PV inverter enters standby when the input voltage of PV strings can enable auxiliary power supply to run but cannot meet the inverter operation requirements, or when the input voltage of PV strings can meet the inverter start requirements but cannot meet its minimum power requirements. In operating mode, the PV inverter is grid-tied and generates electricity, tracking the maximum power point to maximize PV string output. It converts DC power from PV strings into AC power and feeds the power to the grid. The PV inverter will enter the shutdown mode if detecting a fault or a shutdown command. In shutdown mode, the PV inverter switches from standby or operating mode if detecting a fault or a shutdown command. The inverter switches from shutdown mode to standby mode if receiving a Startup command or detecting that a fault is rectified.
The inverter can be equipped with communication modules for monitoring and control. The WIFI module implements communication with a Cloud server through a wireless network to monitor PV inverter's data status. The GPRS module communicates with a Cloud server through a mobile phone to monitor PV inverter's data status. The RS485 switching module monitors PV inverter's data status through collecting and uploading data to a Cloud server. These modules support a baud rate of 9600BPS.
The inverter also features a user interface with an LED indicator and an optional LCD display. The LED indicator shows the inverter's status (blue for standby/normal, green for limited power operation, red for various faults like grid over/under voltage, grid over/under frequency, PV over voltage, insulation resistance abnormal, leakage current abnormal, control power abnormal, arc fault, DC bias current abnormal, inverter relay abnormal, inverter over temperature, leakage current HCT abnormal, system fault, fan fault, DC link under/over voltage, internal communications fault, software version incompatibility, EEPROM fault, sampling inconsistency, boost circuit abnormal, and remote off). The LCD display provides detailed information such as model name, version, PV voltage, AC voltage, total energy, and current status.
The Astris 3K/5K/6K inverters are designed for outdoor use and are protected to IP65, meaning they are dust-tight and protected against water jets. The ambient temperature for optimal operation and extended service life is below 50°C. The inverter must be installed in a well-ventilated environment to ensure good heat dissipation. It should be free from direct exposure to sunlight, rain, and snow. If no shelter is available, an awning should be built.
Installation space requirements dictate minimum clearances around the inverter for proper ventilation and heat dissipation. For single inverter installations, a minimum of 150mm clearance is required on the top, bottom, and sides, and 500mm in front. For multiple inverters installed along the same line, sufficient space must be available between them. In triangle mode, the inverters should be spaced at least 100mm from each other horizontally and 300mm vertically. In stacked mode, a minimum of 150mm horizontal clearance and 1000mm vertical clearance is required between rows.
The inverter can be installed upright or with a maximum back tilt of 15 degrees to facilitate heat dissipation. Incorrect installation modes (horizontally, upside-down, or wrong inclination) are not recommended as they can lead to failure of the inverter operation.
Electrical connections require specific cable types and cross-sectional areas. For 3K inverters, outdoor copper-core AC power cables with a cross-sectional area of 4mm² are recommended, with an outer diameter of 10-14mm. For 5K/6K inverters, 6mm² outdoor copper-core AC power cables with an outer diameter of 10-14mm are recommended. Recommended circuit breaker specifications are 25A for 3K, 32A for 5K, and 40A for 6K. An independent circuit breaker must be installed on the AC side.
PV string connections require specific input routes: 3K inverters connect to route 1, while 5K/6K inverters connect to route 2. Recommended DC input cable specifications for 3K and 5K/6K are common PV cables in the industry (model: PV1-F) with a cross-sectional area of 4-6mm² and an outer diameter of 5-8mm.
The inverter is designed for user-friendly operation. After installation, the user can power on the inverter by switching on the AC circuit breaker. The inverter will then turn on and display LED indicator lights. The LED status lights indicate the inverter's operational state, including grid-connecting status. Any query during operating the PV inverter should be directed to the dealer.
Powering off the inverter involves running a shutdown command on the mobile APP, switching off the circuit breaker at the AC terminal, and then observing the inverter's switch to "OFF" status. It is crucial to wait ten minutes after power-off before any maintenance to avoid electrical shock and body burns.
The user interface, with its LED indicator and optional LCD, provides real-time status and data. The LED colors (blue, green, red) indicate different operational states and warnings. The LCD displays detailed information such as model name, version, PV voltage, AC voltage, total energy, and current status, as well as countdowns for grid connection.
The inverter supports power limit functions, which can be configured via an APP. These functions include disabling the power limit, setting the power limit mode (Meter on Grid or On Grid), setting the power limit CT ratio (1000:1), and defining maximum feed-in grid power. The APP also allows for setting the meter position (on load or on grid) and adjusting the digital power meter type (DDSU666).
Routine maintenance is crucial for the inverter's longevity and efficient operation. This includes:
Before maintaining and commissioning the inverter, and its peripheral distribution unit, switch off all the charged terminals of the inverter and wait at least 10 minutes after the inverter is powered off.
The manual provides a detailed troubleshooting guide for various alarm conditions, including:
The manual also outlines procedures for removing the inverter, which involves disconnecting all cables (inverter, communications, DC input power, AC output power, and PGND cables) and removing the rear panel. Before removing DC input connector, double check and ensure DC input switch is turned OFF to avoid inverter damage and personal injury.
Finally, the document addresses the disposal of the inverter and old electrical & electronic equipment, emphasizing that the PV inverter and its packing case are made from environment-friendly materials and should not be discarded with household garbage. It should be handed over to an applicable collection point for recycling.
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