• MCS-certified products
  • Next Day Delivery
0800 193 6010 sales@clearraysolar.com
FOX ESS H3 12.0KW 3PH Hybrid Inverter with 3PH CT Meter
Fox ESS OUT OF STOCK

FOX ESS H3 12.0KW 3PH Hybrid Inverter with 3PH CT Meter

FE-H3-12.0-CT
£1,588.62 ex VAT £1,906.34 inc VAT

How many inverters do you need?

Secure Checkout 14-Day Returns Tracked Delivery
High Conversion EfficiencyMore of your solar reaches the home
MPPT TrackingMaximises yield in changing light
Grid CompliantMeets UK G98 / G99 requirements
Technical Specifications
Rated Power (Pmax)12,000 W
Module Efficiency97.30 %
Battery Voltage180 - 600 V
MPPT Quantity2
Min MPPT Voltage160 V
Max MPPT Voltage950 V
Max Input Voltage1,000 V
Max DC Power15,000 W
Max AC Power (5 min)13,200 VA
Max DC Current26 / 14 A
Max DC Inputs3
Integrated DC SwitchYes
Height519 mm
Width449 mm
Depth198 mm
Weight28 kg
IP RatingIP65
Operating Temperature-25 °C to +60 °C
Warranty5 years standard, 10 years when the installation is registered with Fox ESS online
View Full Datasheet

FOX ESS H3 12.0KW 3PH Hybrid Inverter with 3PH CT Meter

Fox ESS · H3 Series

FOX ESS H3 12.0KW 3PH Hybrid Inverter with 3PH CT Meter

Fox ESS H3 Series — Three-phase hybrid storage from 8 kW to 12 kW, supplied with the CT meter.

If the house has a three-phase supply, a three-phase hybrid is almost always the right answer. It balances generation and battery discharge across all three legs, which is what DNOs care about, and it means the backup output can serve three-phase loads rather than only one leg.

Rated AC output
12,000 WThree phase on-grid output
Backup output
12,000 VAContinuous EPS power in a grid outage
Maximum PV input
15,000 WArray size this inverter accepts
Battery window
180 – 600 VThe architecture it takes
Peak efficiency
97.30 %Conversion efficiency at best
Backup switch time
<20 msHow fast it takes over
Warranty
5 yearsStandard, 10 years when the installation is registered with Fox ESS online
Important

Please read before ordering

This part is made up of the following items:
1 x FE-H3-12.0 FOX ESS H3 12.0KW 3PH Hybrid Inverter
1 x FE-3PH-METER-CT Fox 3PH Meter (CHINT DTSU666)
Overview

About the Fox ESS H3 Series

The H3 covers 8 kW and 12 kW in the models we stock, with a 1,000 V DC side and a 160 – 950 V MPPT window. Two independent trackers with two strings on the first and one on the second handle a split roof, and the 26 A first tracker takes modern high-current modules.

The SKUs we list include the three-phase CT meter, which the inverter needs for consumption monitoring and export control. On many competitors that is a separate line item.

Battery compatibility

Which battery does this inverter take?

This inverter takes High voltage Fox ESS stacks.

This model has a battery voltage window of 180 – 600 V, a maximum charge or discharge current of 26.0 A, BMS communication over CAN to the inverter.

A stack is one master module, which carries the BMS, plus matching slave modules of the same type. Module types are never mixed in one stack. These are the counts this inverter is listed for — Product Compatibility Fox ESS UK 2026, the module count range for this inverter family:

Battery modules this inverter accepts
CQ72 to 12 modules — 14.04 to 84.24 kWh
EQ50003 to 6 modules — 14.76 to 29.52 kWh
EQ48003 to 9 modules — 13.98 to 41.94 kWh
EQ29003 to 7 modules — 8.64 to 20.16 kWh
ECS48003 to 7 modules — 14.22 to 33.18 kWh
ECS4300 / EC43003 to 7 modules — 12.42 to 28.98 kWh
ECS41003 to 7 modules — 12.09 to 28.21 kWh
ECS29003 to 7 modules — 8.64 to 20.16 kWh
EP5 / EP61 to 4 modules — 5.18 to 20.72 kWh
EP11 / EP121 to 4 modules — 11.52 to 46.08 kWh

What we stock that fits this inverter:

Fox ESS CQ7 Master Promo Stock Only2 to 12 modules on this inverter, 14.0 to 84.2 kWh.
Fox EQ5000 4.92kWh HV Battery (Master)3 to 6 modules on this inverter, 14.8 to 29.5 kWh.
Fox EQ4800, 4.66kWh HV Battery (Master)3 to 9 modules on this inverter, 14.0 to 41.9 kWh.
Fox high-voltage modules are not mixed: a stack is one type, one master and the matching slaves, and the module count must sit inside the range above for this inverter. A Fox low-voltage battery (LV52) will not work on any of these inverters, and a high-voltage stack will not work on a low-voltage one.
For the installer

String design, battery limits and what is in the box

The details that decide whether this unit suits the job:

  • Battery window 180 – 600 V, LFP, 26 A maximum charge or discharge, CAN plus RS485 for BMS upgrades.
  • Two MPP trackers. Tracker A takes 26 A across two strings, tracker B takes 14 A on one — they are not symmetrical, so check the string design against the right input.
  • 1,000 V maximum DC, 720 V rated, 160 V start-up, 160 – 950 V MPPT window.
  • AC input up to 16 kVA for grid charging.
  • EPS peak is notably generous: 14 kVA on the 8 kW and 15 kVA on the 12 kW, for 60 seconds.
  • DC switch fitted. Surge protection Type II on both sides. AFCI optional.
  • The three-phase CT meter is included with the SKUs we stock.
  • 449 × 519 × 198 mm, 28 kg, IP65, fan cooled at 45 dB on these models.
Applications

Where this hybrid earns its place

The H3 Series is specified most often for these jobs.

Three-phase houses with storageBalanced generation and discharge across all three legs.
Three-phase backupEPS serves three-phase loads, not just one leg.
Larger domestic and light commercial8 kW to 12 kW with up to 15 kW of PV.
Split roofsTwo trackers, asymmetric current ratings.
Off-peak tariff charging16 kVA AC input.
Sites needing consumption monitoringCT meter supplied with the unit.
Before you order

Things worth knowing about this listing

These notes come from us and from the manufacturer, and they are the ones that most often cause a problem after delivery:
  • Fox ESS inverters are NOT compatible with SolarEdge or Huawei power optimisers. They are compatible with Tigo optimisers.
  • Register the installation with Fox ESS at fox-ess.com to activate the 10-year warranty. Unregistered, the cover is 5 years.
Technical specification

Fox ESS H3-12.0-E technical data

This model
Maximum PV input power15,000 W
Maximum input current26 / 14 A
Maximum short circuit current32 / 16 A
Strings per MPP tracker2 / 1
Output, backup and performance
Rated AC output power12,000 W
Maximum apparent AC power13,200 VA
Rated AC output current17.4 A
Maximum AC output current21.2 A
Maximum AC input power (grid charging)16,000 VA
Maximum AC input current24.2 A
Backup (EPS) continuous power12,000 VA
Backup (EPS) peak power15,000 VA for 60 s
Backup (EPS) maximum current17.4 A
Maximum efficiency97.30 %
European efficiency98.00 %
CoolingFan cooling
Noise emission45 dB
Common to the range
Maximum input voltage1,000 V
Start-up input voltage160 V
Rated input voltage720 V
MPPT operating voltage range160 – 950 V
Number of independent MPP trackers2
Battery typeLithium battery (LFP)
Battery voltage range180 – 600 V
Maximum charge / discharge current26.0 A
Battery communicationCAN to the inverter, RS485 to upgrade the BMS
Rated grid voltage3L/N/PE 380/220, 400/230, 415/240 V
Rated grid frequency50 / 60 Hz
Power factor1, adjustable 0.8 leading to 0.8 lagging
THDi<3 % at rated power
EPS rated output voltage3L/N/PE 400/230 V, 50 / 60 Hz
EPS switch time<20 ms
EPS THDv at linear load<3 %
Maximum battery charge efficiency, PV to battery at full load98.50 %
Maximum battery discharge efficiency, battery to AC at full load97.00 %
Insulation monitoringYes
Residual current monitoringYes
DC reverse polarity protectionYes
Anti-islanding protectionYes
DC switchYes
Surge protectionDC Type II / AC Type II
AFCIOptional
Dimensions (W × H × D)449 × 519 × 198 mm
Weight28 kg
InstallationWall mounted
TopologyTransformerless
Maximum operating altitude2,000 m
Operating temperature range−25 °C to +60 °C
Humidity (non-condensing)0 – 100 %
Ingress protectionIP65
Standby consumption<15 W
MonitoringWi-Fi, LAN, 4G, GPRS (optional)
Communication2 × RS485, DRM, ripple control, USB
DisplayLCD, app and website
Compliance and warranty
Grid connection standardsEN 50549-1, C10/11, VDE-AR-N 4105, G98, CEI 0-21
Safety and EMCEN 62109-1, EN 62109-2, EN 62477-1; IEC 61000-6-1, IEC 61000-6-3
Warranty5 years standard, 10 years when the installation is registered with Fox ESS online
Specification sourceData Sheet Fox H3/AC3 5-12 kW, version 3.0, 8 April 2022
Goes with this

Ordered with this inverter more often than anything else

A hybrid is the middle of a system, not the whole of it. These are the parts our customers add most often:

Fox ESS AI Link - EMS Box for 3PH SystemAI Link EMS box for three-phase export limitation and multi-inverter control.
Fox WLAN-WW Monitoring StickWi-Fi dongle for FoxCloud monitoring and remote firmware updates.
Fox ESS 4G-2 Dongle4G dongle for a site with no broadband at the inverter.
Frequently asked questions

Questions we get asked about this inverter

Why is one tracker 26 A and the other 14 A?

Fox size tracker A for two strings and tracker B for one. Put the larger sub-array on A. It is a common source of underperformance when the array is wired the other way round.

Is the meter really included?

Yes, on the SKUs we stock — the title says 'with 3PH CT Meter'. It is required for consumption monitoring and export limitation.

What does the EPS run?

8,000 VA continuous on the 8 kW model with a 14,000 VA peak for 60 seconds, across three phases. That headroom is what starts motors.

Which battery?

A Fox high voltage stack in the 180 – 600 V window. Check module count against Fox's compatibility matrix for the H3 family — the CQ7 range is 2 to 12 modules.

Is it noisy?

These models are fan cooled at about 45 dB. Site it in a garage or plant space rather than next to a bedroom.

ClearRay Solar

Documents, advice and trade pricing

Every datasheet, certificate, installation manual and warranty document we hold for this product is in the Documents tab below. See the rest of our hybrid inverter range, our batteries and our solar panels, or email sales@clearraysolar.com if you would like us to check a battery pairing or a string design before you order.

High Efficiency 97.30 %More power from the same roof space
IP65 RatedBuilt for UK weather conditions

Build your complete solar system

Everything you need in one place.

  • Inverters
  • Batteries
  • Mounting Systems
  • Cabling & Accessories
  • Protection Devices
Build a system
Documents & Certificates
CE Declaration of Conformity Fox H3/AC3 EN Data Sheet Fox H3AC3 5 - 12kWh G99 Certificate Test Report H3 12kW EN IEC Certificate EN IEC 61000-6 H3 5-12 kW
Shipping & Returns

Delivery times vary by region:

  • UK — 1-2 business days
  • Highlands & Islands — 1-2 business days

Returns accepted within 14 days of delivery for unused items in original packaging.