This document describes the DASSTECH Solar Photovoltaic DSP-338i-ODS inverter, a grid-tied inverter designed to convert DC current from PV modules into AC current for feeding into the public grid.

Function Description

The DSP-338i-ODS inverter is equipped with several functional modules to ensure efficient and safe operation:

Data Transmission: The inverter can be monitored remotely via an advanced communications system based on an RS485 serial interface or remotely via Wi-Fi. This allows for the transfer of power output information, alarm data, and operational status to a PC terminal or local data acquisition device, which can then be uploaded to a server. For multiple inverters, they can be connected in a daisy chain mode over the RS485 communication cable.
Energy Management Unit:
- Remote Switching On/Off: The inverter can be switched on or off through an external (remote) control.
- Feeding Reactive Power into the Grid: The inverter can produce and feed reactive power into the grid by adjusting the phase shift factor. This feed-in management can be controlled directly by the grid company via a dedicated RS485 serial interface.
- Limiting Active Power Fed into the Grid: If enabled, the inverter can limit the amount of active power fed into the grid to a desired percentage.
- Self-Power Reduction when Grid Over Frequency: When the grid frequency exceeds a limited value, the inverter automatically reduces its output power to contribute to grid stability.
- Power Reduction due to Environmental Conditions, Input/Output Voltage: The inverter can reduce power during certain periods of the day based on ambient temperature, input voltage, grid voltage, and available power from the photovoltaic field.
- Software Update: Firmware updates can be performed using an SD card.
Protection Modules:
- Anti-Islanding: In the event of a local grid outage or maintenance operations, the inverter automatically disconnects from the grid to protect personnel, complying with national standards and laws.
- RCMU (Residual Current Monitoring Unit): Sofar inverters feature redundant monitoring of ground leakage current for both direct and alternating current components. Two independent processors continuously measure leakage current, and if an anomaly is detected by either, the protection system trips, separating the inverter from the grid and stopping the conversion process.
- Grid Monitoring: Continuous monitoring of grid voltage ensures that voltage and frequency values remain within operating limits.
- Inverter Internal Device Protection: The inverter includes various internal protections to safeguard its components during abnormal grid or DC input conditions.
- Ground Fault Protection: Designed for use with panels having "floating" connections (positive and negative terminals without ground connections), an advanced ground fault protection circuit continuously monitors the ground connection and disconnects the inverter if a ground fault is detected, indicated by a red LED on the front panel.

Important Technical Specifications

Input Parameter (DC):
- Max. input voltage: 1000V
- Start-up input voltage: 200V
- Number of independent MPPT: 2
- Number of DC inputs: 1 for each MPPT
- Operating input volt range: 160V-960V
- Max. input MPPT current: 11A/11A
- Max. PV Short current Isc: 14A
- Input range with Full power operation with 2 MPPT parallel: 380V-850V
- Recommended Max PV input power: 11710Wp
Output Parameter (AC):
- Rated power: 8000W
- Max. AC power: 8800VA
- Rated AC voltage: 3/N/PE 230V/400V
- Grid voltage range: 310-480Vac (adjustable)
- Grid frequency range: 44-55Hz/54-66Hz (adjustable, must meet local grid requirements)
- Active power adjustable range: 0-100%
- THDI: <3%
- Power factor: 1 (adjustable +/-0.8)
- Max. output current: 12.8A
Efficiency, Safety and Protection:
- Max efficiency: 98.3%
- Weighted eff. (EU/CEC): 98%
- Self-consumption at night: <1W
- Feed in start power: 25W
- MPPT efficiency: >99.5%
- Safety protection: Anti islanding, RCMU, Ground fault monitoring
- Certification: CE, AS/NZS 4777, VDE V 0124-100, V 0126-1-1, VDE-AR-N 4105, CEI 0-21, EN50438/EN50549, G83, Rd1699, UTE C15-712-1, EN50530, NB/T32004 (more available on request)
- Communication: RS485, Wifi(option), GPRS (option)
- Current (inrush) peak and duration: 5.5A/28us
- Maximum output fault current a.c.A: 42A
- Maximum output overcurrent protection a.c.A: 39A
General Data:
- Ambient temperature range: -25°C ~ +60°C
- Allowable relative humidity range: 0-100% no condensing
- Topology: Transformerless
- Degree of protection: IP65
- Max. operating altitude: 2000m
- Weight: 22kg
- Cooling: Nature
- Dimension: 457X452X200mm
- Current to array (dc μA): <800uA
- Inrush current output inrush current and duration: 0.8A/2us
- Protective class: Class I
- Over voltage category: PV: OVC II, AC mains: OVC III
- Environment pollution degree: Outside housing: Degree 3, Inside housing: Degree 2
- Warranty: 5/10 years (Optional)

Usage Features

Installation: The inverter should be installed vertically on a suitable load-bearing surface, ensuring proper ventilation and adequate space for maintenance. Electrical connections must comply with current electrical regulations and be performed by a qualified electrical engineer. Before electrical connection, PV modules should be covered or the DC switch disconnected to prevent dangerous voltages.
Operation Interface: The inverter features an LCD display and control buttons (Back, Up, Down, Enter) for monitoring states, information, and parameter settings.
- Indicator Lights: Green (States Light) indicates waiting/checking (flashing) or normal operation (ON). Red (Warning Light) indicates fan fault (flashing) or inverter fault (ON). Red (GFCI Warning Light) indicates GFCI fault (ON).
- Standard Interface: Displays inverter energy, power, input information, and warning information.
- Main Interface: Accessed by pressing "Back" from the standard interface, offering options like Set Time, EventList, SystemInfo, System Time, and Software Update.
- Setting Parameters: Users can set various parameters such as country code, input mode (independent or parallel MPPT), safety voltage/frequency protection points, and insulation protection points via the LCD interface.
- Autotest: The inverter supports both "Autotest Fast" and "Autotest STD" to verify its functionality and compliance with grid requirements.
- Event List: Displays real-time event records, including event ID and happening time, accessible through the main interface.
- System Info: Provides details on inverter type, serial number, software/hardware version, country code, input mode, and power factor.
DRMs Functions: The DSP-338i-ODS has five TTL inputs and one 5V power output for Demand Response Enabling Device (DRED) functions, particularly for Australia. These functions allow for external control of the inverter's operation based on grid demands.

Maintenance Features

Routine Maintenance: Inverters generally do not require daily or routine maintenance.
Cleaning: Use a hand blower, soft dry cloth, or brush to clean the inverter. Avoid using water, corrosive chemicals, or intense cleaning agents. Always switch off AC and DC power supplies before cleaning.
Troubleshooting: The manual provides a comprehensive list of event codes and their corresponding solutions for diagnosing and resolving issues, including grid abnormalities, input voltage/current imbalances, internal hardware faults, and communication errors.
Decommissioning: Steps include switching off AC and DC power, waiting 5 minutes for discharge, and releasing DC and AC connectors.
Packaging and Storage: If possible, pack the inverter in its original packaging. Store in a dry place between -25°C and +70°C.
Disposal: At the end of its life, the inverter and packaging materials should be disposed of at facilities capable of handling and recycling electrical equipment safely.
Warranty: A standard warranty period of 60 months (5 years) is provided, calculated from the purchase invoice date or production date if no invoice is available. Extended warranty options (5, 10, 15 years) are available for purchase within specific timeframes. The warranty does not cover failures due to incorrect installation, unauthorized modifications, improper use, poor ventilation, natural disasters, or non-compliance with safety regulations.

DASS Tech DSP-338i-ODS - 页 8

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