The Fronius Eco 25.0-3-S is a high-power three-phase photovoltaic inverter designed for commercial and industrial solar installations.

Engineered for large-scale systems, this inverter combines robust construction, high efficiency, and advanced connectivity, making it ideal for demanding environments and continuous operation.

With a single high-voltage MPPT, it is optimized for systems with uniform string design, ensuring efficient energy conversion at scale. The integrated WLAN, LAN, and webserver enable real-time monitoring and remote management.

Its IP66 protection rating provides maximum resistance against dust and water, allowing reliable operation in harsh outdoor conditions.

⚙️ Identification Data

• Brand: Fronius
• Model: Eco 25.0-3-S
• Part Number: 4,210,056,040
• Type: Three-phase string inverter (transformerless)

🔌 AC Side (Grid Output)

• Nominal voltage: 220/380 V – 230/400 V
• Frequency: 50 / 60 Hz
• Grid system: 3~ NPE (three-phase with neutral)
• Nominal current:
  • 37.9 A (380 V)
  • 36.2 A (400 V)
• Maximum current: 42 A
• Rated apparent power (Smax): 25,000 VA
• Active power:
  • 22,500 W (cos φ = 0.9)
  • 25,000 W (cos φ = 1)
• Power factor: 0 – 1 (adjustable inductive/capacitive)

☀️ DC Side (PV Input)

• MPPT voltage range: 580 – 850 V
• DC voltage range: 580 – 1000 V
• Maximum DC current: 44.2 A
• Short-circuit current (Isc): 71.6 A
• Number of MPPTs: 1 (high-voltage tracker)

🌐 Communication & Smart Features

• Integrated WLAN (Wi-Fi)
• Integrated LAN (Ethernet)
• Built-in Webserver
• Remote monitoring and plant management
• Demand Response Management (DRM) support

🛡 Protection & Certifications

• Protection rating: IP66 (dust-tight and water-resistant)
• Safety class: Class I
• Overvoltage category: OVC 2 / OVC 3

Compliance:

• CEI 0-16 / CEI 0-21
• VDE-AR-N 4105
• DIN VDE V 0126-1-1
• AS/NZS 4777.2
• ÖVE/ÖNORM E 8001-4-712

🧠 Key Features

✔ High-efficiency 25 kW industrial inverter
✔ Single MPPT optimized for large, uniform PV arrays
✔ Integrated Wi-Fi, LAN, and webserver
✔ Rugged design with IP66 protection for harsh environments
✔ Stable three-phase output for commercial applications
✔ Compact design for simplified installation

🏭 Applications

Ideal for:

✔ Industrial photovoltaic systems
✔ Commercial buildings and warehouses
✔ Large rooftop solar installations
✔ Ground-mounted PV systems
✔ Installations up to 25 kW and beyond

💡 Typical Use Case

Perfect for large-scale PV systems where high efficiency, durability, and remote monitoring are essential, especially in industrial or outdoor environments.

🚀 Commercial Summary

The Fronius Eco 25.0-3-S is a powerful 25kW three-phase inverter, built for demanding commercial and industrial photovoltaic systems. With IP66 protection, integrated connectivity, and high-voltage MPPT, it delivers a reliable, efficient, and scalable solution for large solar installations.