The Fronius Symo 7.0-3-M Light is a three-phase grid-connected photovoltaic inverter designed to convert direct current (DC) generated by photovoltaic modules into alternating current (AC) synchronized with the three-phase electrical grid.
With a nominal AC power of 7000W / 7kW, the device is suitable for high-power residential photovoltaic systems, commercial installations and distributed generation systems. The Light version belongs to the Fronius Symo family, characterized by Transformerless architecture and three-phase design. Official Fronius documentation confirms for the Symo 7.0-3-M model a nominal power of 7000W, 2 MPPTs, DC voltage up to 1000V and maximum efficiency of 98%.
The system with 2 independent MPPT trackers allows more flexible photovoltaic configurations, making it particularly useful for roofs with different orientations, separate strings or different irradiation conditions.
Fronius SuperFlex Design technology improves flexibility in photovoltaic generator configuration, while the wide DC voltage range allows use with different string configurations, always within the electrical limits specified by the manufacturer.
⚙️ Main Features
Three-Phase Grid-Connected Photovoltaic Inverter
Nominal AC Power: 7000W / 7kW
Maximum Apparent Power: 7000VA
Three-Phase Grid Connection: 400/230V AC
Transformerless Technology
Number of MPPTs: 2 Independent MPPTs
Fronius SuperFlex Design System
Maximum DC Voltage: 1000V
MPP Voltage Range: 228–800V DC
Overall DC Range: 150–1000V DC
Maximum Efficiency: 98%
Integrated DC Disconnect Switch
Active Cooling
IP65 Environmental Protection
Suitable for Indoor and Outdoor Installations
Professional Design for Three-Phase Photovoltaic Systems
📋 Technical Specifications
Brand: Fronius
Series: Symo
Model: Symo 7.0-3-M Light
Type: Grid-Connected Photovoltaic Inverter
Grid Configuration: Three-Phase
Nominal AC Power: 7000W / 7kW
Maximum Apparent Power: 7000VA
Nominal Grid Voltage: 3~ NPE 400/230V – 3~ NPE 380/220V
Nominal Frequency: 50 / 60Hz
Number of MPPTs: 2 Independent MPPTs
Maximum MPPT Input Current: 16A / 16A
Number of DC Connections: 2 + 2
Minimum DC Voltage: 150V
Maximum DC Voltage: 1000V
DC Start-Up Voltage: 200V
Nominal DC Voltage: 595V
MPP Voltage Range: 228–800V DC
Usable MPP Range: 150–800V DC
Maximum PV Generator Power: 14kWpeak
Nominal AC Output Current: 10.1A
Maximum Efficiency: 98%
Technology: Transformerless
Cooling: Controlled Active Ventilation
DC Disconnect Switch: Integrated
Environmental Protection: IP65
Operating Temperature: -25°C / +60°C
Dimensions: 645 × 431 × 204 mm
Weight: Approx. 21.9kg
The main data, including the fundamental specification of 2 MPPTs, are verified on the official technical page for the model and the series datasheet.
🔧 Integrated Functions
The inverter automatically manages photovoltaic energy conversion and three-phase power feed-in to the electrical grid.
Main Functions:
Dual Automatic MPPT Tracking
Independent Management of 2 Photovoltaic Arrays
Electronic DC/AC Conversion
Automatic Synchronization with the Three-Phase Grid
Grid Voltage and Frequency Monitoring
Continuous Monitoring of DC-Side Parameters
Automatic Maximum Power Point Management
SuperFlex Design for Flexible PV Configurations
Thermal Monitoring
Automatic Ventilation Management
Integrated Diagnostics
Event and Error Logging
Integrated DC Isolation
Protection in Case of Electrical Parameters Outside Permitted Limits
⚠️ Possible Errors and Faults
The Fronius Symo 7.0-3-M Light features internal diagnostics and can report State Codes related to grid conditions, photovoltaic array, temperature, communication or internal electronics.
Main Possible Faults:
AC Grid Voltage Error – Grid Voltage Outside Permitted Limits
Grid Frequency Error – AC Frequency Outside Range
DC Voltage Too High – PV Input Above Permitted Limits
Insufficient DC Voltage – Photovoltaic Voltage Too Low for Start-Up
DC Insulation Error – Possible Leakage to Ground
Insufficient Insulation Resistance
MPPT Error – Fault in Maximum Power Point Management
Imbalance Between MPPT Inputs – Possible Abnormal Difference Between PV Arrays
Inverter Overtemperature
Automatic Power Reduction Due to Temperature
Ventilation / Fan Error
Internal Communication Error
Data Interface Error
Grid Synchronization Failure
Power Electronics Error
Grid Relay Error
Permanent Internal Fault
State Code Requiring Technical Assistance
For exact numerical codes, the manual corresponding to the specific firmware revision and national configuration should be used, avoiding attribution of unverified codes to the individual unit.
🔌 Compatibility
Compatible, subject to technical verification of electrical parameters, with:
Three-Phase Photovoltaic Systems
400/230V AC Grids
Grid-Tie Photovoltaic Systems
Installations with Two Different Roof Orientations
Configurations with 2 Independent MPPT Arrays
PV Strings Compatible with the 228–800V DC MPP Range
Photovoltaic Generators Within the Specified Limits
High-Power Residential Installations
Small and Medium Commercial Installations
Retrofit Applications
🏭 Applications
Ideal for:
Three-Phase Residential Photovoltaic Systems
PV Systems of Approximately 7kW
Commercial Installations
Roofs with Different Orientations
Photovoltaic Configurations with 2 MPPTs
Retrofit of Existing Installations
Replacement of Compatible Three-Phase Inverters
Distributed Generation Systems
🌟 Advantages
7kW Nominal Power
2 Independent MPPTs
Maximum Efficiency up to 98%
Transformerless Technology
SuperFlex Design
Wide DC Voltage Range
Maximum Input Voltage: 1000V DC
Flexible PV String Management
Integrated DC Disconnect Switch
IP65 Protection
Indoor and Outdoor Installation
Robust Professional Construction
High Flexibility for Complex Installations
Professional Fronius Symo Platform
📦 Product Condition
Used Inverter
Fully Working / Fully Functional
Operation Declared as Tested
Possible Normal Signs and Traces of Use
Cosmetic Condition to Be Evaluated According to the Photographs of the Individual Unit
Ready for Use as a Spare or Replacement Unit, Subject to Verification of Electrical and Regulatory Compatibility with the Installation