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Fronius IG Plus 12.0 WYE277 > 12 kW 277 Volt Inverter
Fronius IG Plus 12.0 WYE277 - 12,000 Watt 277 Volt Inverter - 4,210,106,800

Warranty: 10 Years

Stock Status:(Out of Stock)
Availability: This product has been discontinued.
Product Code: FRONIUS-IG-PLUS-12-0-3-WYE277

Description Datasheet

Fronius IG Plus 12000 Watt Grid-Tie Inverter

277 Volt
96.2% Efficiency
Manufacturer Part Number: 4,210,106,800

An outstanding addition to the family: The next generation Fronius IG Plus inverter builds on a successful model with multiple enhancements, including maximum power harvest, a built-in six circuit string combiner, integrated, lockable DC Disconnect, signifi cantly improved effi ciency, and unbeatable reliability. New, larger power stages expand the proven Fronius IG family from 2 to 12 kW in a single inverter.


Grounding selectable on site.

Decide on site what type of grounding is required as the Fronius IG Plus is field programmable for either positive or negative module grounding.

Designed for indoor and outdoor installations.

All Fronius IG Plus inverters have a robust, well designed aluminum housing. UV resistance and corrosion protection enable them to be used either indoors or outdoors. Fronius is proud to be one of the only inverters tested and approved to operate at 122° F.

Integrated DC disconnect.

No external DC disconnect installation or cabling is necessary. The Fronius IG Plus comes complete with an approved, built-in, lockable and load breakable DC Disconnect.

The new power plug system.

The connection area and power stages are installed separately from each other. Very easy and extremely safe: The connection area is attached to the wall as normal. Then the power module is simply plugged in. The power plug connects both parts into one secure unit. If service is required, the connector remains on the wall maintaining all settings and configurations.

Field Programmable AC output voltage.

The Fronius IG Plus inverter line from 3.0 to 11.4 kW is field programmable to 208, 240 or 277 volts (Fronius IG Plus 12.0 kW only availabale in 277 volts), eliminating the need to install different inverter models to accommodate three-phase installations.


240 277
Input Data Fronius IG Plus 11.4-1 UNI 11.4-3 DELTA 12.0-3 WYE277
Recommended PV Power (Wp) 9700-13100 9700-13100 10200-13800
MPPT Voltage Range 230-500 V
DC Startup Voltage 245 Volts
Max input voltage (at 1000 W/m2
14° F (-10° C) in open circuit operation)
Nominal input current 31.4 A 31.4 A 33.1 A
Max usable input current 53.3 A 53.3 A 56.1 A
Admissible conductor size (DC) No. 14 - 6 AWG
Number of DC input terminals 6
Max current per DC input terminal 20 A; Bus bar available for higher input currents
Output Data
Nominal output power 11400 W 11400 W 12000 W
Max continuous output power
104° F (40° C) 208 V / 240 V / 277 V
11400 W 11400 W 12000 W
Nominal AC output voltage 208 V / 240 V / 277 V 208 V / 240 V 277 V
Operating AC Voltage Range 208 V183 - 229 V (-12 / +10 %)
240 V211 - 264 V (-12 / +10 %)
277 V244 - 305 V (-12 / +10 %)
Max Continuous output current 208 54.8 A 31.6 A NA
240 47.5 A 27.4 A NA
277 41.2 A NA 14.4 A
Admissible conductor size (AC) No. 14-4 AWG
Max continuous utility back feed current 0 A
Nominal Output Frequency 60 Hz
Operating frequency range 59.3 - 60.5 Hz
Total harmonic distortion < 3%
Power factor 1
General Data
Max Efficiency 96.2%
CEC Efficiency 208 95.5 95.0 NA
96.0 95.5 NA
96.0 NA 96.0
Consumption in standby (night) < 1 W
Consumption during operation 22 W
Cooling Controlled forced ventilation, variable fan speed
Enclosure Type NEMA 3R
Unit Dimensions (W x H x D) 17.1" x 48.1" x 9.6"
Power Stack Weight 82 lbs (37 kg)
Wiring compartment weight 26 lbs (12 kg)
Admissible ambient operating temerature -4 ... 122° F (-20 ... +50° C)
Compliance UL 1741-2005, IEEE 1547-2003, IEEE 1547.1, ANSI/IEEE C62.41, FCC Part 15 A& B, NEC Article 690, C22. 2 No. 107.1-01 (Sept. 2001)

Detailed Description

Three efficiency peaks.

Greater power harvest for every system size: The unique automatic transformer switching function of the Fronius IG Plus makes enables not one, but three equal efficiency peaks. The result: Consistantly high efficiency over a wide input voltage range.

In comparison: The efficiency of inverters without transformer switching declines steadily with an increasing input voltage. Devices without a transformer only have one efficiency peak.

With a 96.2 % maximum efficiency, the Fronius IG Plus series scores the highest grade among HF devices.

MIX™ Concept.

Get the maximum power harvest out of partial load ranges, e.g. on cloudy days, through a clever combination of multiple power stages in each inverter. The power stages in Fronius inverters divide up the work depending on operating hours and only operate as many power stages as required to efficiently process available power from the PV array.

Module Manager

The Module Manager keeps all Fronius IG inverters at the maximum power point (MPP) with fast and exact MPP tracking, ensuring that you get the most power out or each ray of sunlight. This is especially important for amorphous modules whose MPP can be more challenging to track.

Smart Ventilation Design.

Disruptive ambient factors such as biological infestation, dust, moisture or coastal salt air stay outside the new Fronius IG Plus Inverters away from the circuitry. How: Cool air is drawn in through a filter screen on the back of the invertar and routed through a closed channel over the heat sink. This prevents contact between outside air and the circuit boards while cooling the inverter components ensuring the inverter operates consistendly. All circuit boards are also dipped in Conformal coating to prpovide an added measure of protection.

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