Fox ESS T25-G3 25kW T Series Three-Phase Dual MPPT Grid-Tie PV Inverter
The Fox ESS T25-G3 (part number FE-T-25.0) is a 25.0 kW three-phase, dual-MPPT grid-tie PV inverter and the largest model in the Fox ESS T Series G3 range. With a maximum efficiency of 98.6%, a Euro efficiency of 97.8%, and an MPPT tracking efficiency of 99.8%, the T25-G3 is designed for commercial and large-scale domestic three-phase installations. It features a start-up voltage of 140 V, an MPPT operating range of 140 V to 1,000 V, and accepts a maximum DC input of 37,500 W at up to 1,100 V across two independent MPPT trackers with 2+2 string configuration. The T25-G3 is IP65 rated for outdoor installation, weighs 21 kg, and measures 370 x 480 x 183.5 mm. It is battery ready for future upgrade with Fox ESS storage solutions. Available from DECO Group, a UK solar wholesaler for professional trade installers.
Key Technical Details
- Part number: FE-T-25.0
- Supplier part number: T25
- Model: T25-G3
- Inverter type: Three-phase grid-tie, transformerless
- Rated output power: 25,000 W
- Maximum output apparent power: 27,500 VA
- Rated output current: 36.2 A
- Maximum output current: 39.9 A
- Rated grid voltage: 3/N/PE, 220/380 V, 230/400 V, 240/415 V
- Rated grid frequency: 50/60 Hz
- Power factor: 1 (adjustable from 0.8 leading to 0.8 lagging)
- Total harmonic distortion (THDi): less than 3%
- Maximum PV input power: 37,500 W
- Maximum input voltage: 1,100 V
- MPPT operating voltage range: 140 V to 1,000 V
- Rated input voltage: 600 V
- DC startup voltage: 140 V
- Maximum DC input current: 28 A per MPPT
- Maximum short-circuit current: 36.4 A per MPPT
- MPPT quantity: 2
- Strings per MPPT: 2 + 2
- DC fuses: 4
- MPPT efficiency: 99.8%
- Maximum efficiency: 98.6%
- Euro efficiency: 97.8%
- Connector: MC4 (4 included)
- DC switch: Optional
- AFCI: Optional
- Surge protection: Type II (DC and AC)
- Communication: RS485, Meter, DRM, E-stop
- Monitoring module: WiFi / 4G (optional)
- Display: LCD, touch key, app, website
- Cooling: Fan
- Noise emission (typical): less than 55 dB
- Ingress protection: IP65
- Operating temperature range: -25°C to 60°C
- Humidity: 0% to 100% (no condensation)
- Maximum operating altitude: 3,000 m
- Internal consumption at night: less than 3 W
- Dimensions: 370 x 480 x 183.5 mm (W x H x D)
- Weight: 21 kg
Key Features
- Largest model in the T Series G3 range at 25 kW rated output
- Three-phase output for balanced grid connection on commercial properties
- Dual MPPT trackers with 2+2 string configuration, supporting 4 independent strings
- 98.6% maximum efficiency with 99.8% MPPT tracking efficiency
- High input voltage ceiling of 1,100 V allowing longer string lengths
- Wide MPPT range of 140 V to 1,000 V
- Maximum 37,500 W DC input giving a 1.5:1 DC/AC ratio
- 28 A maximum input current per MPPT for compatibility with high-current modules
- Built-in Type II surge protection on both DC and AC sides
- IP65 rated for outdoor installation
- Fan-cooled for sustained high-power operation
- Battery ready for future integration with Fox ESS storage solutions
- Remote monitoring via Fox Cloud smartphone app or web portal
System Compatibility
- The largest model in the Fox ESS T Series G3 three-phase dual-MPPT range (3.0 kW to 25.0 kW)
- MC4 DC connectors (4 pairs included)
- Compatible with high-efficiency and bifacial solar modules
- Battery ready when paired with Fox ESS storage solutions
- Supports export limitation
- Optional DC switch and AFCI available
Protection Features
- Insulation monitoring
- Residual current monitoring
- PV string current monitoring
- DC reverse polarity protection
- Anti-islanding protection
- AC short-circuit protection
- AC overcurrent protection
- AC overvoltage protection
- Surge protection: Type II (DC and AC)
Certifications and Compliance
- EN 62109-1/2 (Safety)
- EN 50549-1
- G99
- G100
- EMC: EN 61000-6-1/2/3/4
Warranty
- Standard warranty: 5 years
- Extended warranty: 10 years when the installation is registered with Fox ESS online
Common Questions
Click a question below to reveal the answer.
What is the maximum DC input on the Fox ESS T25-G3?
The T25-G3 accepts up to 37,500 W (37.5 kW) of DC input against a 25,000 W rated AC output, giving a 1.5:1 DC/AC ratio. This is the highest DC capacity in the T Series G3 range.
How many string inputs does the Fox ESS T25-G3 have?
The T25-G3 has a 2+2 string configuration across its two MPPT trackers, giving 4 independent string inputs with 28 A maximum current per MPPT.
Can the Fox ESS T25-G3 be used with battery storage?
The T25-G3 is battery ready. It can be upgraded to include storage when paired with Fox ESS storage solutions.
What are the dimensions and weight of the Fox ESS T25-G3?
The T25-G3 measures 370 x 480 x 183.5 mm (W x H x D) and weighs 21 kg. Despite being the most powerful model in the range, it shares the same compact enclosure as the rest of the T Series G3.
Is the Fox ESS T25-G3 suitable for commercial installations?
Yes. At 25 kW with 4 string inputs, 1,100 V maximum input voltage, and 37.5 kW DC capacity, the T25-G3 is well suited to commercial PV systems. G99 compliant for installations above the G98 threshold.
DECO Group stocks the full Fox ESS T Series G3 three-phase inverter range from 3.0 kW to 25.0 kW alongside Fox ESS storage systems, monitoring modules, and compatible system accessories. Browse our Fox ESS three-phase inverter catalogue for complete commercial and domestic system components.
About DECO Group
We are a UK-based solar wholesaler supplying three-phase grid-tie inverters, hybrid storage, and system accessories to professional installers and electrical contractors. Our Fox ESS T Series G3 range covers every wattage from 3.0 kW residential through to 25.0 kW commercial, all supported by monitoring hardware and balance-of-system components. Visit decogroup.co.uk for the complete range.
