Fronius Eco 25.0-3-S 3ph 25kW Solar Inverter

Fronius Eco 25.0-3-S 3ph 25kW Solar Inverter

  • 3 phase (Fronius 25.0-3-S) solar inverter, including display
  • 25 kW
  • Max. input voltage [V]: 1000
  • Number of DC connections: 6
  • Max. input current (Idc max): 44,2 A
  • Including WLAN / Ethernet LAN and DC-circuit breaker
  • 2 years warranty, 5 years after registration; up to 20 years optional. Please note the country-specific service & warranty conditions of the manufacturer (Fronius).
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The Fronius Eco 25.0-3-S 3ph 25kW Solar Inverter is a compact project inverter for maximum yields. The three-phase Fronius Eco in power categories 25.0 and 27.0 kW perfectly meets all the requirements of large-scale installations.

Fronius Eco 25.0-3-S 25kW Solar Inverter for Sale

Thanks to its light weight and SnapINverter mounting system, this transformerless device can be installed quickly and easily either indoors or outdoors. This inverter range is setting new standards with its IP 66 protection class. Furthermore, thanks to its integrated double fuse holders and optional overvoltage protection, string collection boxes are no longer necessary.

The main features of the Fronius Eco inverter

  • SnapINverter Technology
  • Integrated data communication
  • Smart Grid Ready
  • Dynamic Peak Manager
  • Zero feed-in
Fronius Eco Solar Inverter Logo
The history of Fronius begins in 1945. The company is now represented by subsidiaries in 28 countries and by sales partners and representatives in over 60 countries, and is a recognized innovation and technology leader. Since 2011, Fronius has been led by the granddaughter of the company founder, Elisabeth Engelbrechtsmüller-Strauß. However, the company´s goal remains the same as ever: to create a sustainable future through innovation, quality and a first-rate service. The best solar power inverters and solar PV Accessories from the best NASDAQ and Bloomberg listed solar manufacturers at the best retail price.

Related links to the Fronius Eco 25.0-3-S 3ph 25kW Solar Inverter :

on grid grid tied solar pv inverters

Fronius Inverters, from the Austrian Fronius are recognized as high performing inverters with higher rate of self- consumption, intelligent control of energy flows and limiting energy export to the grid. Fronius is known for its reliability and high quality products across the globe.

Avoid north facing walls exposed to direct sunlight at midday, while and easterly facing wall, under a small veranda which provides shade is better suited. Inside garages can also be a good spot, as long the solar inverter is away from direct sunshine for prolonged periods of the day.

As a general rule of thumb, the size of your inverter should be similar to the DC rating of your solar panel system; if you are installing a 6 kilowatt (kW) system, you can expect the proposed inverter to be around 6000 W, plus or minus a small percentage. Due to the power losses in your PV system 0Bills DIY Solar Store recommends to install between 15% and 20% higher installed solar panel capacity than the nominal rating of your inverter you intend to purchase.

A grid tie (connected) inverter has a lifespan ranging from 10 to 20 years. You should expect most good quality units to last 10 years minimum. Solar inverters have warranties ranging from 5 to 12 years with an increasing number of manufacturers offering pay for service warranty extension. From our experience as closer the cumulated Maximum Voltage of your solar panels to the Max Input Voltage of the grid tie inverter the shorter the life of the power inverter you have. We recommend that that your strings maximum voltage to be around 10% less than the allowed input voltage of your inverter.

Your Inverter Can Handle The Extra Panel Capacity to a certain extend ONLY! Provided the system is properly designed, they have no problems greatly exceeding this limit safely. What inverter manufacturers care about is that the voltage and current entering the inverter never at any point exceed their specified limits. With all that said it is strongly recommended to pay attention to the max voltage of your inverter!

All of Fronius’ inverters are manufactured in Austria, EU. All Fronius products from the solar power inverter range come with CE certification and are fully certified for USA and Australian markets as well.

It is like asking which car is better: BMW or Mercedes? While Fronius has a wider offer of size ranges, SMA has a higher average efficiency rating and lower price point. Though, it may be worth comparing prices if multiple inverters are required under SMA, there may be a single inverter option with Fronius. With all this said both are Tier 1 solar power inverters with superior quality and performance.

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Why Choose Wind and Sun Energy? Why Go Solar With Us?

0Bills DIY Store is a leading online solar and wind energy supply store serving European and American homeowners and businesses. We design and supply quality Solar Power Kits and System Packages both ready assembled and custom tailored for your needs. Our retail and wholesale pricing reflects the relationships we carry with the manufacturers we stock, ensuring the best deals for our customers.

We carry everything you need for your grid tied or off-grid system. Our Solar PanelsInvertersEnergy Storage, Solar Accessories and Mounting are second to none in quality, reliability, efficiency and lifespan. When going solar with us, we help you every step of the way in sourcing the products that matter for your investment.

Let us design and supply your solar panel system for less using the best products in the solar industry. We are proud to be a preferred distributor for solar installers, SMEs, Governments, leading universities and DIY solar homeowners.

Shop confidently with us and receive expert technical help from start to finish. Watch your investment produce free renewable energy for years to come!

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Additional information

Weight 35.7 kg
Dimensions 51 × 22.5 × 72.5 cm
Product Category

Inverters, on-grid inverters, SOLAR PHOTOVOLTAIC (PV)



Rated Power (W/kW)

25 kW

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Fronius Eco 25.0-3-S 3ph 25kW Solar Inverter

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Technical Data

INPUT DATA Fronius Eco 25.0-3-S
Max. input current
(Idc max)
44.2 A
Max. array short circuit current
(Isc PV)
71.6 A
Min. input voltage (Udc min) 580 V
Feed-in start voltage (Udc start) 650 V
Nominal input voltage (Udc,r) 580 V
Max. input voltage
(Udc max)
1,000 V
MPP voltage range
(Umpp min – Umpp max)
580 – 850 V
Number of MPP trackers 1
Number of DC connections 6
Max. PV generator output (Pdc max) 37.8 kWpeak
AC nominal output (Pac,r) 25,000 W
Max. output power 25,000 VA
AC output current (Iac no) 37.9 A / 36.2 A
Grid connection (voltage range) 3~NPE 380 V / 220 V or 3~NPE 400 V / 230 V (+20 % / -30 %)
Frequency (frequency range) 50 Hz / 60 Hz (45 – 65 Hz)
Frequency range (fmin – fmax) 45 – 65 Hz
Total harmonic distortion < 2.0 %
Power factor (cos φac,r) 0 – 1 ind. / cap.
(height x width x depth)
725 x 510 x 225 mm
Weight 35.7 kg
Degree of protection IP 66
Protection class 1
Overvoltage category (DC / AC)1) 1 + 2 / 3
Night time consumption < 1 W
Inverter design Transformerless
Cooling Regulated air cooling
Installation Indoor and outdoor installation
Ambient temperature range -25°C to +60°C
Permitted humidity 0 % to 100 %
Max. altitude 2,000 m
DC connection technology 6x DC+ and 6x DC- screw terminals 2.5 mm² – 16 mm²
AC connection technology 5 pole AC screw terminals 2.5 mm² – 16 mm²
Certificates and compliance with standards ÖVE / ÖNORM E 8001-4-712, DIN V VDE 0126-1-1/A1, VDE AR N 4105, IEC 62109-1/-2, IEC 62116, IEC 61727, AS 3100, AS 4777-2, AS 4777-3, CER 06-190, G59/3, UNE 206007-1, SI 4777, CEI 0-16, CEI 0-21
Max. efficiency 98.2 %
European efficiency (ηEU) 97.5 %
η at 5 % Pac,r2)  95.1 / 95.1 %
η at 10 % Pac,r2) 97.0 / 95.2 %
η at 20 % Pac,r2) 97.8 / 96.9 %
η at 25 % Pac,r2) 98.0 / 97.0 %
η at 30 % Pac,r2) 98.1 / 97.2 %
η at 50 % Pac,r2) 98.2 / 97.5 %
η at 75 % Pac,r2) 98.2 / 97.5 %
η at 100 % Pac,r2) 98.2 / 97.5 %
MPP adaption efficiency > 99.9 %
DC insulation measurement Yes
Overload behaviour Operating point shift, power limitation
DC disconnector Yes
Integrated string fuse holders3) Yes
Reverse polarity protection Yes
WLAN / Ethernet LAN Fronius Solar.web, Modbus TCP SunSpec, Fronius Solar API (JSON)
6 inputs and 4 digital in/out Interface to ripple control receiver
USB (type A socket)4) Datalogging, inverter update via USB flash drive
2 x RS422 (RJ45 socket)4) Fronius Solar Net, Interface protocol
Signalling Output4) Energy management (floating relay output)
Datalogger and Webserver Included
External Input4) S0 meter connection / Evaluation of overvoltage protection
RS485 Modbus RTU SunSpec or meter connection

Fronius Eco Solar Inverter logo

The history of the Austrian Fronius begins in 1945. At that time, charging car batteries was not something that could be taken for granted. Günter Fronius was unwilling to accept this. In 1950, Günter Fronius expanded his product portfolio to include welding transformers. Driving forward their growth and internationalisation strategy saw the establishment of subsidiaries around the world. In 1992, the decision was taken to focus on the “future field” of solar energy, which is why the company today is split into three strong divisions: Perfect Welding, Solar Energy and Perfect Charging.