The Fronius Primo 3.0-1 Light is a single-phase photovoltaic inverter designed for residential solar systems with small to medium power requirements. Built on Fronius' proven inverter technology, it delivers efficient DC-to-AC energy conversion, ensuring high performance, reliability, and long-term operational durability.

Part of the Fronius transformerless inverter family, the Primo 3.0-1 Light features a wide MPPT voltage range, a maximum DC input voltage of 1000V, and an IP65-rated enclosure suitable for both indoor and outdoor installations.

The inverter incorporates advanced grid management and monitoring functions compliant with major European and international grid standards.

⚙️ Technical Specifications

Identification Data

• Manufacturer: Fronius
• Model: Primo 3.0-1 Light
• Part Number: 4,210,069,001
• Serial Number: 29026237
• Technology: Single-Phase Transformerless Photovoltaic Inverter

DC Input (Photovoltaic Side)

• MPPT Voltage Range: 200 – 800 VDC
• Maximum PV Input Voltage: 1000 VDC
• Maximum Input Current MPPT 1: 12 A
• Maximum Input Current MPPT 2: 12 A
• Maximum PV Short-Circuit Current: 36 A
• Number of MPPTs: 2 Independent Trackers

AC Output (Grid Side)

• Nominal AC Voltage: 220 / 230 VAC
• Grid Frequency: 50 / 60 Hz
• Grid Configuration: 1~NPE (Single Phase)
• Rated Output Current:
  • 13.6 A @ 220 V
  • 13.0 A @ 230 V
• Maximum Output Current: 13.7 A
• Maximum Apparent Power: 3000 VA
• Maximum Active Power: 2700 W (cos φ = 0.9)
• Adjustable Power Factor: 0.85 Inductive to 1 to 0.85 Capacitive

• 🔧 Main Features

  • High-efficiency DC/AC energy conversion
  • Dual independent MPPT trackers for optimized energy harvesting
  • Intelligent grid connection management
  • Real-time inverter status monitoring
  • Integrated AC and DC protection systems
  • Compatible with residential single-phase PV installations
  • Demand Response Mode (DRM) support
  • Compact and robust transformerless design
  • Suitable for indoor and outdoor installations

  • 🏠 Applications

    Ideal for:

    • Residential photovoltaic systems
    • Single-phase solar installations
    • PV systems up to approximately 3 kW
    • Retrofit and inverter replacement projects
    • Residential energy production systems
    • Rooftop solar installations

    ⚠️ Common Faults and Error Conditions

    AC Grid Errors

    Possible alarms:

    • Grid Fault
    • Grid Voltage High
    • Grid Voltage Low
    • Grid Frequency Error
    • No Grid

    Possible causes:

    • Grid voltage outside permitted limits
    • Unstable grid frequency
    • Faulty AC wiring
    • Utility grid disconnection

    Photovoltaic Input Errors

    Possible alarms:

    • PV Voltage Too High
    • Isolation Fault
    • Ground Fault
    • DC Input Error

    Possible causes:

    • Oversized PV strings
    • Ground leakage currents
    • Damaged MC4 connectors
    • Insulation failures within the PV array

    Thermal Errors

    Possible alarms:

    • Overtemperature
    • Cooling System Fault

    Possible causes:

    • Insufficient ventilation
    • Dust accumulation on heat sinks
    • High ambient temperatures
    • Restricted airflow

    Common Electronic Failures

    Typical issues may include:

    • Aging electrolytic capacitors
    • Auxiliary power supply failures
    • Worn grid interface relays
    • Surge-damaged MOVs (varistors)
    • Faulty control boards
    • Voltage and current sensing circuit failures
    • Communication board issues

    🛠 Typical Symptoms

    Grid Connection Problems

    Symptoms:

    ❗ Inverter does not connect to the grid
    ❗ Frequent disconnections
    ❗ Reduced energy production

    DC Input Problems

    Symptoms:

    ❗ PV voltage alarms
    ❗ Isolation warnings
    ❗ Ground fault notifications

    Thermal Issues

    Symptoms:

    ❗ Power derating
    ❗ High internal temperature warnings
    ❗ Unexpected shutdowns

    Electronic Component Failures

    Symptoms:

    ❗ Startup failure
    ❗ Intermittent operation
    ❗ Communication errors
    ❗ Internal fault alarms

    ✅ Advantages

    • Proven Fronius reliability and performance
    • Dual independent MPPT tracking
    • Wide photovoltaic voltage operating range
    • IP65 environmental protection
    • Transformerless high-efficiency design
    • Compliance with international grid standards
    • Suitable for indoor and outdoor installations
    • Easy maintenance and diagnostics
    • Excellent long-term operational stability

    📦 Product Condition

    • Used / Refurbished (if applicable)
    • Professionally tested
    • Operationally verified
    • Suitable for replacement, maintenance, or system upgrades
    • Ideal spare inverter for Fronius-based photovoltaic systems

    🟢 Summary

    The Fronius Primo 3.0-1 Light is a 3kW single-phase transformerless photovoltaic inverter designed for residential solar installations. Featuring dual MPPT trackers, 1000V DC input capability, IP65 protection, and advanced grid management functions, it provides reliable and efficient solar energy conversion for modern residential photovoltaic systems.