Fronius Symo 12.5-3-M

With power categories ranging from 3.0 to 20.0 kW, the transformerless Fronius Symo is the three-phase inverter for every system size. Owing to the SuperFlex Design, the Fronius Symo is the perfect answer to irregularly shaped or different roof orientations. A WLAN or Ethernet internet connection as standard plus easy integration of third-party components make the Fronius Symo one of the most communicative inverters on the market. Furthermore, the meter interface permits dynamic feed-in management and a clear visualisation of consumption.

  • WiFi and Ethernet System Monitoring
  • Smart Grid Ready
  • Open Data Communication
  • Energy Management Function
  • Export Limitation and Dynamic Peak Manager
  • Proactive Service

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Taking your energy supply into your own hands? Saving money and protecting the climate? Yes, it is possible! A photovoltaic system provides renewable energy for your home.

At a basic level, you need energy for the following three areas:

  • Current: For powering domestic appliances
  • Heating & cooling: Heating and air conditioning
  • Mobility: Charging electric cars


Number of MPP trackers
Max. input current (Idc max)
27,0 / 16,5 A
Max. short circuit current, module array
40,5 / 24,8 A
DC input voltage range (Udc min – Udc max)
200 – 1000 V
Feed-in start voltage (Udc start)
200 V
Nominal input voltage (Udc,r)
600 V
MPP voltage range (Umpp min – Umpp max)
320 – 800 V
Usable MPP voltage range200 – 800 V
Number of DC connections3 + 3
Max. PV generator power (Pdc max)
18,8 kWpeak


AC nominal output (Pac,r)
12,5 kW
Max. output power (Pac max)
12,5 kVA
AC output current (Iac nom)
18 A
Grid connection (Uac,r)
3~ NPE 400/230, 3~ NPE 380/220 V
AC voltage range (Umin – Umax)
150 – 280 V
Frequency (fr)
50 / 60 Hz
Frequency range (fmin – fmax)
45 – 65 Hz
Total harmonic distortion
2,0 %
Power factor (cos φac,r)
0 – 1 ind./cap.