Fox ESS Grid Backup 9.5-33.2kWh Energy Storage System with 5.0kW AC Charger Inverter

£4,108.68 £4,713.70
By Fox ESS

Installation & VAT Refund

Delivery available

Maximizing Energy Efficiency with Fox ESS Grid Backup 9.5-33.2kWh System

A Grid Backup Energy Storage System allows you to store energy from inexpensive sources, such as mains power at off-peak Octopus tariff. This energy can be utilized instead of exporting power at low feed-in tariffs or relying on costly peak-rate power.

The Fox ESS Grid Backup 9.5-33.2kWh Energy Storage System with 5.0kW AC1 Charger Inverter (9.5-33.2kWh/3.7kW ESS) consists of:

  • 1x Fox ECS HV EC4800 4.74kWh High Voltage Battery (Master)
  • 1x ... 6x Fox ECS HV EC4800 4.74kWh High Voltage Battery (Slave)
  • 1x Fox ESS 5.0kW AC1 Charger Inverter

The 9.5-15kWh/5.0kW Grid Backup ESS helps effectively manage energy usage with the benefit of a stable electricity supply and cost reduction (e.g., charging a battery with low-priced Octopus electricity). Using an ESS with a private power source such as on-grid solar panels, you can supply electricity for 24/7 home power.

The 5.0kW AC1 Charger Inverter is compatible with an external backup generator that supplies electricity to your home in the case of a prolonged grid outage when the battery storage is emptied.

  • Fox ESS HV EC4800 (Master) & EC4800 (Slave) 4.74kWh HV Battery Packs consist of the ECS high-performance, scalable battery storage module. The modular design allows for maximum flexibility with storage. Additional batteries can be installed in series, allowing a maximum storage capacity of 33.2kWh (1 Master and up to 6 Slaves). Installation is easy, with a plug-and-play solution that can save valuable time for installers. The batteries have a 95% charge/discharge efficiency and 90% depth of discharge. The batteries have a cycle life of over 6000 cycles.

  • Fox ESS 5.0kW AC1 Charger Inverter is a high-quality inverter that converts solar energy to AC energy stored in a battery. The inverter can be used to optimize energy consumption, store energy in the battery for future use, or feed energy into the energy grid. System advantages:
    • Advanced DSP control technology
    • Utilizes the latest high-efficiency power components
    • Advanced anti-islanding
    • Max. efficiency up to 97.8%, THD<3%
    • Export limitation (CT/Meter/DRM0/ENSTOP)
    • WiFi remote control (with WiFi dongle installed)
  • Fox ESS 5.0kW AC1 Charger Inverter has four work modes:
    • Self-use: The battery will discharge for local loads first, and the grid will supply power when the battery capacity is not enough.
    • Feed in priority: In the case of an external generator, the power generated will be used to supply the local loads first, then export to the grid. The redundant power will charge the battery.
    • Force time use: This mode is used in the area which has peak and off-peak prices. The user can use off-peak electricity to charge the battery. The charging and discharging time can be set flexibly, and this also allows one to choose whether to charge from the grid or not.
    • Back up (EPS) mode: When the grid experiences an outage, the system will supply emergency power from PV or a battery to supply the home loads.
  • The Fox ESS Grid Backup 9.5-33.2kWh Energy Storage System has been designed to work seamlessly with smart Octopus tariffs. The first energy supplier to offer such a tariff is Octopus Energy, but the Fox energy storage system also works perfectly with any other energy provider. The Fox energy storage system can be controlled automatically to take advantage of Plunge Prices and super cheap prices. With solar panels and the battery storage system, your electric unit price can be drastically reduced!
  • TWO WORKING DAY DELIVERY within the UK (longer to the Highlands, islands, and Northern Ireland).
    FOX ESS HV EC4800 (Master) & EC4800 (Slave) 4.74KWH BATTERY PACKS
    Battery Type: Lithium Iron Phosphate (LiFePO4)
    Nominal Capacity: 4.74kWh
    Nominal Voltage with Npcs Slave Batteries: 1pc 89.6V; 2pcs 134.4V; 3pcs 179.2V; 4pcs 234.0V; 5pcs 268.8V; 6pcs 313.6V
    Operating Voltage with Npcs Slave Batteries: 1pc 81.2 - 103V; 2pcs 121.8 - 154.5V; 3pcs 162.4 - 206V; 4pcs 203 - 257.6V; 5pcs 243.6 - 309.1V; 6pcs 284.2 - 360.6V
    Recommended Discharge Current: 25A
    Max. Charge/Discharge Current: 50A
    Peak Discharge Current: 65A @30sec
    Battery Pack Round-Trip Efficiency: >95%
    Depth of Discharge: 90%
    Storage Temperature: -20 ~ +50°C
    Charge/Discharge Efficiency: >98%
    Cycle Life: >6000*
    Communication: CAN
    Installation Location: Outdoor/Indoor (Standard)
    Ingress Protection: IP65
    Operating Temperature: -10 ... +55°C
    Storage Temperature: -10 ... +35°C
    Cooling Method: Natural Convection
    Humidity: 0% to 100% (No Condensing)
    Weight with Npcs Slave Batteries: 1pc 82kg; 2pcs 121kg; 3pcs 160kg; 4pcs 199kg; 5pcs 238kg; 6pcs 277kg
    Size (W*D*H) with Npcs Slave Batteries:  1pc 570*380*386mm; 2pcs 570*380*524mm ; 3pcs 570*380*662mm; 4pcs 570*380*800mm; 5pcs 570*380*938mm; 6pcs 570*380*1076mm
    Safety: IEC 62619
    *1 25C, @90% DOD, 0.5C charging/discharging
    Battery Type: Lithium Iron Phosphate (LiFePO4)
    Battery Voltage: 85-450V
    Max. Charge/Discharge Current: 40A
    Communication Interface: CAN (Communicate With Inverter)
    Max. AC Input Power: 10000VA
    Max. Input Current (per phase): 45.5A
    Rated Output Power: 5000W
    Max. Output Apparent Power: 5500VA
    Rated Output Current (per phase): 21.7A
    Max. Output Current: 23.9A
    Rated Grid Voltage: 220-240VAC
    Rated Grid Frequency: 50/60Hz
    Power Factor: 1 ( Adjustable from 0.8 leading to 0.8 lagging )
    THDi: <3% @rated power
    Max. Output Apparent Power: 6000VA
    Peak Output Apparent Power (60sec): 7200VA
    Max. Current (per phase): 26.1A
    Rated Output Voltage: 220-240VAC
    Rated Output Frequency: 50/60Hz
    Power Factor: 1 ( Adjustable from 0.8 leading to 0.8 lagging )
    THDi (linear load): <2% @rated power
    Switch Time: 20ms
    Max. Efficiency: 97.80%
    Max. Battery Discharge Efficiency (BAT to AC)(@full load): 97.00%
    Operating Temperature: -25 ~ +60°C
    Protection Degree: IP65
    Size:  430 x 410 x 178mm

    Net Weight: 23kg

    • 1x Fox ESS HV EC4800 (Master) 4.74kWh High Voltage Battery
    • 1x ... 6x Fox ESS HV EC4800 (Slave) 4.74kWh High Voltage Battery
    • 1x Fox ESS 5.0kW AC1 Charger Inverter
     Don't know an answer to your question? Call us on 020 8064 0335 or email