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1️⃣ Overview

The Fronius Primo 3.0-1 is a single-phase photovoltaic (PV) grid-tied inverter with a rated output of 3 kW (3000 W). It is designed for residential and small commercial solar systems and converts DC power from solar modules into AC power suitable for the grid (230 V).

Key features:

• High-efficiency transformerless inverter

• Integrated Maximum Power Point Tracking (MPPT) for optimal energy harvest

• Grid-compliant with European standards

• Lightweight, compact, and suitable for indoor or outdoor installation

• Advanced safety features including anti-islanding protection

2️⃣ Safety Instructions ⚠️

• Installation and maintenance must be performed by qualified personnel only.

• Disconnect all AC and DC supply before servicing the inverter.

• Wait at least 5 minutes after shutdown before opening the unit (internal capacitors may remain charged).

• Ensure proper grounding (PE connection).

• Do not install in explosive, flammable, or excessively humid environments.

• Follow local electrical codes and utility regulations.

3️⃣ System Requirements

• Single-phase 230 V AC grid connection

• PV array voltage within the inverter DC input range

• AC circuit breaker and DC isolator installed according to local standards

• Adequate ventilation and clearance around the inverter

4️⃣ Installation

A. Mounting

1. Mount the inverter on a solid vertical surface or suitable structure.

2. Ensure at least 30 cm clearance for airflow and maintenance.

3. Avoid direct exposure to water or excessive dust.

B. DC Connection

1. Turn off AC and DC isolators.

2. Connect PV modules to the DC input terminals, observing correct polarity.

3. Ensure PV voltage is within the allowed input range.

C. AC Connection

1. Connect L (phase), N (neutral), and PE (ground).

2. Install an AC circuit breaker for protection.

3. Tighten terminals according to the manufacturer’s torque specification.

5️⃣ Startup Procedure 🚀

1. Turn on the DC isolator.

2. Turn on the AC circuit breaker.

3. Inverter performs a self-test and initialization.

4. Display indicates system startup → grid verification → power production.

5. When grid parameters are verified, inverter begins feeding energy into the grid.

6️⃣ Display & Operation

The Fronius Primo display shows:

• PV voltage and current

• AC output voltage and current

• Active and reactive power

• Energy produced (kWh)

• Status and error messages

Buttons allow:

• Viewing system status

• Accessing production data

• Reviewing error and event history

7️⃣ Monitoring & Communication

• Compatible with Fronius Solar.web via optional communication module (Wi-Fi or Ethernet).

• Provides real-time monitoring and historical data logging.

• Supports multiple inverters in one network for centralized monitoring.

8️⃣ Maintenance

• Clean ventilation openings every 6–12 months.

• Check DC and AC cable connections annually.

• Inspect for dust, dirt, or moisture.

• No internal user-serviceable components.

9️⃣ Common Fault Codes

If faults persist, contact a Fronius-certified technician.

🔟 Shutdown Procedure

1. Turn off AC breaker.

2. Turn off DC isolator.

3. Wait at least 5 minutes before opening or performing maintenance.

Technical Summary

• Rated Power: 3 kW (3000 W)

• AC Output: Single-phase 230 V

• DC Input: PV modules (check nameplate for voltage range)

• MPPT: Integrated

• Cooling: Natural convection

• Protection: IP65 (outdoor suitable)

• Certifications: CE, VDE, UL