The Fox Bundle KH1-10.0 + CQ7 21kWh Storage (Part No: FE-10.0-CQ7-21) is a complete PV and storage package pairing the Fox KH1-10.0 K Series Hybrid Inverter (FE-KH1-10.0) with a 21.06kWh Fox ESS CQ7 high-voltage battery stack. The package supplies everything needed to convert and store solar generation in one matched set: 1 x Fox KH1-10.0 K Series Hybrid Inverter (FE-KH1-10.0), 1 x CQ7 Master (FE-CQ7-M) and 2 x CQ7 Slave modules (FE-CQ7-S), factory-matched to deliver a KH1-10.0 single-phase hybrid system built for larger or multi-orientation PV arrays, with a three-module CQ7 stack and room to expand later.
21.06kWh
Battery Capacity
15.0kW
Max. PV Input Power
97.8%
Max. Inverter Efficiency
IP65
Inverter & Battery Rating
Installation Must Be Carried Out by a Qualified Electrician
This is a fixed-wiring, high-voltage system requiring installation by a qualified, competent electrician in line with BS 7671 and Part P of the Building Regulations. At a rated output of 10,000W, the FE-KH1-10.0 exceeds the 3.68kW G98 self-certification threshold, so grid connection requires formal notification under G99 to the local Distribution Network Operator (DNO) before commissioning. Any system claiming Smart Export Guarantee (SEG) payments must be installed by an MCS-certified installer using MCS-certified equipment.
Solar Panels and Mounting Are Not Included
This package supplies the inverter and battery stack only. PV panels, roof or ground mounting hardware, DC isolators, AC isolators and cabling are not included and must be specified separately. A dedicated import/export energy meter is required if the cable run between inverter and incoming supply exceeds 30m.
Why This Combination
The 21.06kWh CQ7 stack (1 Master + 2 Slaves) sits comfortably within the K Series' supported range of 2–7 modules (14.04–49.14kWh) per stack, giving installers headroom to add up to four further CQ7 Slave modules later without replacing the inverter or Master. With 4 independent MPP trackers, the FE-KH1-10.0 is built for larger arrays spread across multiple roof orientations, where a 2-MPPT H1-G2 inverter would run out of strings.
Why It Performs
4-MPPT Hybrid Inverter
The FE-KH1-10.0 runs 4 independent MPP trackers (one string per tracker), with a maximum recommended PV input power of 15.0kW — suited to larger roofs or arrays split across several orientations.
Integrated EPS Backup
Built-in Emergency Power Supply (EPS) with a sub-10ms switch time automatically transfers essential loads to battery power during a grid outage.
Stackable CQ7 Storage
The bundled 21.06kWh stack (1 Master + 2 Slaves) can be expanded with additional CQ7 Slave modules (FE-CQ7-S) up to the inverter's 7-module / 49.14kWh limit, without touching the existing Master or inverter.
High Round-Trip Efficiency
Inverter Euro efficiency of 97.4% and battery round-trip efficiency of >95% combine to minimise conversion losses between the panels, the battery and the home.
Fanless, Outdoor-Rated Hardware
Both the inverter and battery stack carry an IP65 rating and use natural convection cooling — no fans, no moving parts, and suitable for outdoor wall or floor installation.
Smart Tariff Compatible
Built-in WiFi and FoxCloud connectivity support smart, time-of-use tariff automation (e.g. Octopus Agile) through Fox ESS's own platform and third-party integrations such as Kraken and Capture AI.
Technical Specification
What's Included (Part No: FE-10.0-CQ7-21)
| Qty |
Part No. |
Item |
Role in System |
| 1 x |
FE-KH1-10.0 |
Fox KH1-10.0 K Series Single-Phase Hybrid Inverter |
PV conversion, battery charge/discharge, EPS backup |
| 1 x |
FE-CQ7-M |
Fox ESS CQ7 Master |
System controller, BMU and 7.02kWh battery module |
| 2 x |
FE-CQ7-S |
Fox ESS CQ7 Slave |
7.02kWh battery module each (14.04kWh combined) |
Inverter Specification — Fox KH1-10.0 K Series Hybrid (FE-KH1-10.0)
| Specification |
Value |
| PV Input |
| Max. Recommended PV Array |
20,000Wp |
| Max. Recommended PV Input Power |
15,000W |
| Max. DC Voltage |
600V |
| MPPT Voltage Range |
80~500V |
| Start-up Voltage |
75V |
| No. of Independent MPP Trackers |
4 (1 string per tracker) |
| Battery Connection |
| Battery Type |
High-voltage Li-Ion (LFP) |
| Battery Voltage Range |
85~480V |
| Recommended Battery Voltage |
300V |
| Max. Charge/Discharge Current |
50A |
| Communication |
CAN, RS485 |
| AC Output / EPS |
| Rated AC Output Power |
10,000W |
| Max. AC Output Current |
45.7A |
| Rated Grid Voltage / Frequency |
220/230/240V (180~270V), 50/60Hz |
| EPS Backup Output |
Integrated, <10ms switch time, parallel up to 10 units |
| Efficiency |
| Max. Efficiency |
97.8% |
| Euro Efficiency |
97.4% |
| Max. Battery Charge Efficiency |
98.5% |
| Max. Battery Discharge Efficiency |
97.0% |
| Mechanical |
| Dimensions (W x H x D) |
450 x 527 x 208mm |
| Weight |
29kg |
| Ingress Protection |
IP65 |
| Cooling |
Natural convection (fanless) |
| Operating Temperature |
-25~60°C (derating above 45°C) |
| Communication / Monitoring |
WiFi (4G optional), RS485, CT, USB, DRM, FoxCloud app and web portal |
| Standards |
IEC 62109-1/-2, IEC 62477-1, G99, EN 50549 |
Battery Stack Specification — CQ7 21.06kWh (1 Master + 2 Slave)
| Specification |
Value |
| Capacity & Electrical |
| Total Stack Capacity |
21.06kWh (3 x 7.02kWh modules) |
| Nominal Voltage (stack) |
172.8V |
| Battery Type |
LFP (LiFePO₄) |
| Max. Charge/Discharge Current |
80A |
| Depth of Discharge |
90% |
| Round-Trip Efficiency |
>95% |
| Communication |
CAN |
| Mechanical (3-Module Stack) |
| Stack Dimensions (W x D x H) |
660 x 360 x 575mm |
| Stack Weight |
156.0kg ±5% |
| Ingress Protection |
IP65 |
| Installation Location |
Outdoor / Indoor (floor-standing on stand) |
| Expansion Headroom |
| Current Configuration |
1 x Master + 2 x Slave = 21.06kWh |
| Max. With This Inverter |
1 x Master + 6 x Slave = 49.14kWh (add up to 4 more FE-CQ7-S) |
Frequently Asked Questions
What exactly is included in the FE-10.0-CQ7-21 bundle?
The bundle includes 1 x Fox KH1-10.0 K Series Hybrid Inverter (FE-KH1-10.0), 1 x CQ7 Master (FE-CQ7-M) and 2 x CQ7 Slave modules (FE-CQ7-S), giving a combined battery capacity of 21.06kWh. Solar panels, mounting hardware and AC/DC isolators are not included.
Can I add more battery capacity to this bundle later?
Yes. The FE-KH1-10.0 supports CQ7 stacks of up to 7 modules (49.14kWh), so up to 4 additional CQ7 Slave modules (FE-CQ7-S) can be added to the existing Master at any time without replacing the inverter.
Why choose a K Series inverter over the H1-G2 range?
The K Series offers 4 independent MPP trackers against the H1-G2's 2, making it better suited to larger PV arrays or roofs with multiple orientations that need more independent strings. The H1-G2 range is sufficient for simpler 1–2 string systems up to 6kW.
Does this package provide backup power during a grid outage?
Yes. The FE-KH1-10.0 has an integrated Emergency Power Supply (EPS) with a sub-10ms switch time that automatically transfers essential loads onto battery power if the grid fails.
Is this a single-phase or three-phase system?
Single-phase. The Fox KH1-10.0 K Series inverter is a single-phase hybrid inverter, suited to UK domestic and small commercial single-phase supplies.
Will this require a formal G99 application?
Yes. At 10kW rated output, this exceeds the 3.68kW G98 self-certification threshold, so a formal G99 application to the local DNO is required before commissioning. Your MCS-registered installer will typically handle this on your behalf.
