Fox ESS AC3-10.0-E 10kW Three-Phase AC-Coupled Charger Inverter for HV Battery Storage
The Fox ESS AC3-10.0-E (part number FE-AC3-10.0-E) is a 10.0 kW three-phase AC-coupled charger inverter designed to add high-voltage battery storage to existing three-phase solar PV systems. This is a battery inverter with no DC/PV inputs; it charges and discharges batteries on the AC side, making it suitable for retrofitting storage without changing the existing PV inverter. The AC3 supports a wide range of Fox ESS high-voltage batteries including HV2600, ECS2900, ECS4100, ECS4300, EP5, EP6, EP11, and EP12. It achieves a maximum efficiency of 98.0% and a Euro efficiency of 97.3%, includes built-in EPS rated at 10,000 W with less than 20 ms switch time, and supports up to 10 units in parallel. IP65 rated with fan cooling at 45 dB, wall-mounted at 449 x 519 x 198 mm and 28 kg. Requires the FE-3PH-METER-CT for full operation. Available from DECO Group, a UK-based solar trade wholesaler.
Key Technical Details
- Part number: FE-AC3-10.0-E
- Supplier part number: AC3-10.0 (with EPS)
- Model: AC3-10.0-E
- Product type: Three-phase AC-coupled charger inverter (no DC/PV inputs)
- Topology: Transformerless
AC Output (Grid)
- Rated output power: 10,000 W
- Maximum output apparent power: 11,000 VA
- Rated output current (per phase): 14.5 A
- Maximum output current (per phase): 17.4 A
- Rated grid voltage: 3L/N/PE, 380/220 V, 400/230 V, 415/240 V
- Grid frequency: 50 / 60 Hz
- Power factor: 1 (adjustable from 0.8 leading to 0.8 lagging)
- Total harmonic distortion (THDi): less than 3% at rated power
AC Input
- Maximum AC input power: 16,000 VA
- Maximum AC input current (per phase): 24.2 A
Battery
- Battery type: Lithium battery (LFP)
- Battery voltage range: 180 V to 600 V
- Maximum charge/discharge current: 26 A
- Battery communication: CAN / RS485
- Maximum battery charge efficiency: 98.5%
- Maximum battery discharge efficiency: 97.0%
EPS (Emergency Power Supply)
- EPS rated output power: 10,000 W
- EPS maximum apparent power: 15,000 VA (60 second peak)
- EPS switch time: less than 20 ms
- EPS voltage: 3L/N/PE, 400/230 V
- EPS frequency: 50 / 60 Hz
Efficiency
- Maximum efficiency: 98.0%
- Euro efficiency: 97.3%
General
- Cooling: Fan cooling
- Noise emission: 45 dB
- Ingress protection: IP65
- Operating temperature range: -25°C to +60°C
- Humidity: 0% to 100% (no condensation)
- Maximum operating altitude: 2,000 m
- Standby consumption: less than 15 W
- Communication: 2 x RS485, DRM, Ripple Control, USB
- Monitoring module: WiFi / LAN / 4G / GPRS (optional)
- Display: LCD, app, web portal
- Installation: Wall-mounted
- Dimensions: 449 x 519 x 198 mm (W x H x D)
- Weight: 28 kg
Key Features
- Three-phase AC-coupled design adds battery storage to existing PV systems without changing the solar inverter
- 10.0 kW rated output with built-in EPS for backup power (15,000 VA peak for 60 seconds, less than 20 ms switch time)
- 98.0% maximum efficiency with 98.5% charge and 97.0% discharge battery efficiency
- High-voltage battery platform supporting a wide range of Fox ESS batteries (180 V to 600 V)
- Up to 10 inverters can be installed in parallel for large-scale or commercial systems
- Export control ready with correct metering and configuration
- IP65 rated for indoor or outdoor wall-mounted installation
- Fan-cooled at 45 dB
System Compatibility
- Compatible with Fox ESS HV2600 batteries
- Compatible with Fox ESS ECS2900, ECS4100, and ECS4300 batteries
- Compatible with Fox ESS EP5, EP6, EP11, and EP12 batteries
- Use the correct BMS and communications harness for your battery stack
- Requires the FE-3PH-METER-CT (Fox 3PH CT Meter) for full operation
- Up to 10 x AC3 inverters in parallel
- This is an AC-coupled battery inverter with no DC/PV inputs; if retrofitting, it is installed alongside the existing PV inverter, not as a replacement
Installation Notes
- Wall-mounted on a solid, non-combustible surface with adequate clearance for airflow
- At 28 kg, a two-person lift is recommended
- The FE-3PH-METER-CT must be installed correctly for accurate import/export sensing and system control
- Use the correct HV battery harness and communications cabling/BMS as specified for the chosen battery stack
- IP65 rated for outdoor installation; avoid direct extreme exposure where possible
- Qualified installer only; all work must follow local wiring regulations and Fox ESS documentation
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 does "AC-coupled" mean for a three-phase system?
The AC3 charges and discharges batteries on the AC side of the system. It has no DC/PV inputs. This makes it ideal for adding battery storage to an existing three-phase solar PV installation without replacing the existing PV inverter.
What meter is required for the Fox ESS AC3?
The FE-3PH-METER-CT (Fox 3PH CT Meter) is required for full operation. It must be installed correctly for accurate import/export sensing and system control.
What batteries are compatible with the Fox ESS AC3 10kW?
The AC3 supports Fox ESS high-voltage batteries including HV2600, ECS2900, ECS4100, ECS4300, EP5, EP6, EP11, and EP12. Battery voltage range is 180 V to 600 V. Use the correct BMS and communications harness for your chosen battery stack.
Does the Fox ESS AC3 10kW support backup power?
Yes. The AC3 has built-in EPS (emergency power supply) rated at 10,000 W with a peak of 15,000 VA for 60 seconds and a grid-to-backup switch time of less than 20 ms.
How many Fox ESS AC3 inverters can be installed in parallel?
Up to 10 AC3 inverters can be installed in parallel for large-scale or commercial battery storage systems.
DECO Group supplies Fox ESS three-phase AC-coupled charger inverters alongside compatible HV batteries, 3PH CT meters, and all associated system accessories. Browse our Fox ESS storage catalogue for complete three-phase battery retrofit system components.
About DECO Group
We are a UK-based solar and energy storage wholesaler supplying three-phase AC-coupled charger inverters, high-voltage batteries, and system components to professional installers and electrical contractors. Our Fox ESS AC3 range is stocked with all required metering and communications accessories for complete system builds. Visit decogroup.co.uk for the full catalogue.
