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Fronius Eco

The 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. Thanks to its light weight and SnapINverter mounting system, this transformerless device can be installed quickly and easily either indoors or outdoors. This inverter series sets new standards with its IP 66 protection class. In addition, its integrated all-pole string fuse holders and optional DC fuse mean that string collection boxes are no longer required.
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Product details


Number of MPP trackers1
Max. input current (Idc max)
44,2 A
Max. short circuit current, module array*
80 A
DC input voltage range (Udc min - Udc max)
580 - 1000 V
Feed-in start voltage (Udc start)
650 V
Nominal input voltage (Udc,r)
580 V
MPP voltage range (Umpp min - Umpp max)
580 - 850 V
Usable MPP voltage range580 - 850 V
Number of DC connections6
Max. PV generator power (Pdc max
37,8 kWpeak


AC nominal output (Pac,r)
25 kW
Max. output power (Pac max)
25 kVA
AC output current (Iac nom)
37,9 / 36,2 A
Grid connection (Uac,r)
3~ NPE 400/230, 3~ NPE 380/220 V
AC voltage range (Umin - Umax)
150 - 275 V
Frequency (fr)
50 / 60 Hz
Frequency range (fmin - fmax)
45 - 65 Hz
Total harmonic distortion<3% @Pnom (230/400VAC 50Hz)
Power factor (cos φac,r)
0 - 1 ind,/cap,


512 mm
751 mm
227,5 mm
Weight35,5 kg
Weight incl. packaging39,5 kg
Degree of protectionIP 66
Protection class1
Overvoltage category (DC / AC) 1)
2 / 3
Night-time consumption< 1 W
Inverter designTransformerless
CoolingRegulated air cooling
InstallationIndoors and outdoors
Ambient temperature range-25°C - +60°C
Permitted humidity0 - 100 %
Max. altitude 2)
2,000 m / 2500 m
DC connection technology6x DC+ and 6x DC- screw terminals 2.5 - 16 mm²
AC connection technology5-pin AC screw terminals 2.5 - 16 mm²
Certificates and compliance with standardsÖVE / 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, G99, UNE 206007-1, SI 4777, CEI 0-16, CEI 0-21
Sound emissions60,3 dB(A)
Interference emission classB


Max. efficiency (PV - grid)98,2 %
European efficiency (ηEU)98,0 %
η at 5% Pac,r 3)
95,1 / 91,5 %
η at 10% Pac,r 3)
97,0 / 95,2 %
η at 20% Pac,r 3)
97,8 / 96,9 %
η at 25% Pac,r 3)
98,0 / 97,0 %
η at 30% Pac,r 3)
98,1 / 97,2 %
η at 50% Pac,r 3)
98,2 / 97,5 %
η at 75% Pac,r 3)
98,2 / 97,5 %
η at 100% Pac,r 3)
98,2 / 97,5 %
MPP adaptation efficiency> 99,9 %


DC insulation measurementYes
Overload behaviourOperating point shift, power limitation
DC disconnectorYes
Integrated string fuse holderYes
DC Reverse polarity protectionYes


WLAN / Ethernet LANFronius Solar.web, Modbus TCP SunSpec, Fronius Solar API (JSON)
6 inputs and 4 digital inputs/outputsInterface to ripple control receiver
USB (type A socket) 4)
Data logging, inverter update via USB flash drive
2x RS422 (RJ45 socket) 4)
Fronius Solar Net
Signalling output 4)
Energy management (floating relay output)
Datalogger and web serverIntegrated
External input 4)
S0 meter connection / Evaluation of overvoltage protection
RS485Modbus RTU SunSpec or meter connection

SnapINverter technology

The SnapINverter generation of inverters features a simple, standardised mounting system, making installation and maintenance easier than ever. A special feature in the design of the device is that the connection area is separate from the power stage set compartment, with both being installed separately. The remarkably light connection area and all its cabling is fitted to the wall first, followed by the power stage set. The innovative hinged system makes installation and servicing extremely user-friendly. The inverter is simply placed in the wall bracket and then secured. This means that it is not necessary to remove the entire inverter for servicing, just the power stage set. All the cabling remains in place.

Integrated data communication

We are the first inverter manufacturer to offer a data communication package with fully integrated datalogging, WLAN, Ethernet, energy management, web server and a range of interfaces. The inverter is connected to the internet by network cable or WLAN - without additional cabling - and grants you the perfect overview of how the PV system is operating. Connection to third-party components is provided by means of interfaces such as Modbus TCP SunSpec, Modbus RTU SunSpec or Fronius Solar API (JSON). The open interfaces can also be operated in parallel to the Fronius Solar.web.

Smart Grid Ready

Fronius inverters are ready for the Smart Grid of tomorrow. The inverters are optimally equipped to meet the technical requirements of grids in the future. A series of smart functions, known as Advanced Grid Features, are built into the devices. They include a number of control functions for optimum feed-in of reactive power and effective power. These functions are designed to enable stable grid operation even when the PV system density is very high and to prevent unwanted interruptions to feed-in and associated yield losses if grid parameters exceed the thresholds. Fronius inverters therefore help to guarantee the yield of a PV system. Furthermore, where feed-in limits are imposed, Fronius inverters can provide dynamic feed-in control with self-consumption taken into account. Just connect the meter and set the feed-in limit!

Dynamic Peak Manager

The Dynamic Peak Manager is a new MPP tracking algorithm that dynamically adapts its behaviour when searching for the optimal operating point. Its special feature is that the Dynamic Peak Manager automatically checks the entire characteristic curve on a regular basis and finds the global Maximum Power Point (GMPP), even in partial shade.

Zero feed-in

Today, an increasing number of grid operators in various countries are stipulating a PV power feed-in limit as a precondition before a system is connected to the grid. With dynamic power reduction, Fronius is offering a solution for optimum feed-in management. The Inverter supplies the household consumers with energy first and then reduces the system Output to the maximum energy feed-in permitted by the grid operator. With Fronius inverters, zero feed-in is also a possibility thanks to this function, meaning that no PV power is fed into the grid. The relevant requirements of the grid operator can be fulfilled by simply enabling a Setting on the inverter's web interface.

Active Cooling

Active cooling technology relies on one or more fans, which not only avoid hot spots, but also regulate the air circulation inside the inverter, thus keeping the temperature of the power electronics low. This has a positive effect on the service life of the devices, optimises yields and reduces costs. At Fronius, active cooling is supplied as standard in all devices.


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1) According to IEC 62109-1. DIN rail for optional type 1 + 2 or type 2 surge protection device available. 

2) Unrestricted / restricted voltage range. 

3) And at Umpp min / Udc,r / Umpp max.

4) Also available in the light version. 


* Isc pv = Isc max ≥ Isc (STC) x 1,25 according to e.g.: IEC 60364-7-712, NEC 2020, AS/NZS 5033:2021.

Helmut Perr - Managing Director Eco-Tec

“Fronius stands for high quality. Whenever we have any servicing requirements,
their technical hotline provides exceptional support. We are going to use
Fronius Eco inverters again on our next project - a 3 MW commercial field installation
in the Alps.”

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