Engineering report · reviewed against NEC 2026 & BS 7671:2018+A2
Engineering Breakdown: Running a MG4 EV / MG ZS (7kW Single-Phase Mode) on the Fox ESS EP5 Modular Hybrid
When pairing the Fox ESS EP5 Modular Hybrid (5,180 Wh LiFePO4 capacity, 5,000 W continuous, 7,500 W surge) with a MG4 EV / MG ZS (7kW Single-Phase Mode) (7,360 W running, 7,360 W starting surge), the system operates at 147% of continuous inverter capacity on a 230 V UK/EU/AU circuit. Our UK/EU/AU verdict is Continuous Overload, so the runtime figures below are theoretical battery-energy values only. Wiring the connection over a 7.5 m run calls for a 32 A MCB and 4.0 mm² copper, terminated at a Type 2 EVSE · IEC 60309 32A Commando connection.
1. Compatibility Verdict & Inverter Load Utilization
In UK/EU/AU 230 V mode the MG4 EV / MG ZS (7kW Single-Phase Mode) loads the Fox ESS EP5 Modular Hybrid's inverter to 147% of its 5,000 W continuous rating and 98% of its 7,500 W surge rating. Because continuous demand exceeds the inverter by 2,360 W, the unit will shut down within seconds of starting the load. The Sungrow SH10RS Hybrid Inverter + Battery is the smallest compatible upgrade.
| Check | Load requires | Fox ESS EP5 Modular Hybrid provides | UK/EU/AU |
|---|---|---|---|
| Continuous output | 7,360 W | 5,000 W | Fail |
| Start-up surge | 7,360 W | 7,500 W | Pass |
| Voltage | 230 V | 230 V | Pass |
| Connection | Type 2 EVSE · IEC 60309 32A Commando | Hardwired consumer unit (RCBO protected) |
This is a 230 V market charging profile: the 7,360 W figure is the single-phase Type 2 (IEC 62196) rate of 32 A × 230 V. EV supply equipment is a constant-current load with no start-up surge, so the inverter only has to sustain the set current. To stay under the 80% sustained-load guideline, cap the charge current at 17 A in the vehicle or charger app, which holds the Fox ESS EP5 Modular Hybrid near 3,910 W. In the UK, a charge point must meet BS 7671 Section 722 and the Electric Vehicles (Smart Charge Points) Regulations; in Australia and New Zealand, AS/NZS 3000 Section 7 and local network limits apply. A full battery puts about 4.0 kWh into the pack after losses — roughly 22 km (14 miles) of range.
The Fox ESS EP5 Modular Hybrid combines a hybrid solar inverter with stackable battery modules, wired permanently into the home's distribution board. Its 6,500 W PV input lets one unit handle both rooftop solar and storage.
Compatible alternative: the Sungrow SH10RS Hybrid Inverter + Battery with the MG4 EV / MG ZS (7kW Single-Phase Mode) report shows the full sizing for a unit that passes all three checks.
2. Real-World Runtime by Duty Cycle
Nameplate capacity is not usable capacity. DC-to-AC conversion, battery management overhead and cell protection reduce the 5,180 Wh rating to about 4,403 Wh of deliverable AC energy (85% system efficiency). EV charging runs at a fixed current, so the 100% row is the realistic figure; lower rows apply only if you schedule charging in intervals.
| Duty cycle | Average draw | Runtime (no solar) | Energy per 24 h |
|---|---|---|---|
| 25% | 1,840 W | 2.4 hrs | 44.2 kWh |
| 50% | 3,680 W | 1.2 hrs | 88.3 kWh |
| 65% | 4,784 W | 55 min | 114.8 kWh |
| 100% | 7,360 W | 36 min | 176.6 kWh |
Even at a 50% duty cycle the battery lasts 1.2 hrs, so plan on solar, grid or generator recharging for anything longer than an evening outage. Because the inverter cannot actually run this load in UK/EU/AU mode, treat these numbers as an energy-budget reference for a compatible inverter of the same capacity.
3. BS 7671 / IEC 60364 Breaker & Cable Sizing
IEC-based codes size protection by design current rather than a blanket 125% multiplier: Ib ≤ In ≤ Iz. At 230 V the load draws 32.0 A, so a 32 A Type B/C MCB with RCD protection applies. In the UK, BS 7671 Section 722 additionally requires a dedicated circuit and Type A or Type B RCD for EV charge points.
| One-way distance | MCB | Min. cable | Voltage drop |
|---|---|---|---|
| 7.5 m (25 ft) | 32 A | 4.0 mm² | 0.96% |
| 15 m (49 ft) | 32 A | 4.0 mm² | 1.92% |
| 22.5 m (74 ft) | 32 A | 4.0 mm² | 2.89% |
| 30 m (98 ft) | 32 A | 6.0 mm² | 2.57% |
Moving the Fox ESS EP5 Modular Hybrid from 7.5 m to 30 m away forces the conductor up from 4.0 mm² to 6.0 mm² — park the unit as close to the load as ventilation and weather protection allow.
4. Solar Array Recharge Time Breakdown
The Fox ESS EP5 Modular Hybrid accepts up to 6,500 W of photovoltaic input. Real arrays rarely deliver nameplate output, so we apply an 80% harvest factor for MPPT conversion, cell temperature and soiling, and convert hours to days using 4.5 peak-sun-hours — a conservative annual average for the US, southern Europe and Australia (UK winters can fall below 1.5).
| PV array | Real harvest | 0–100% recharge | Sun-days @ 4.5 PSH | Net with load @ 50% |
|---|---|---|---|---|
| 800 W | 640 W | 8.1 hrs | 1.8 | −3,040 W |
| 1,600 W | 1,280 W | 4.0 hrs | 0.9 | −2,400 W |
| 3,000 W | 2,400 W | 2.2 hrs | 0.5 | −1,280 W |
| 6,000 W | 4,800 W | 1.1 hrs | 0.2 | +1,120 W |
| 6,500 W | 5,200 W | 60 min | 0.2 | +1,520 W |
A typical 800 W portable array refills the battery in about 8.1 hrs of strong sun, while maxing out the 6,500 W input cuts that to 60 min. To fully offset the MG4 EV / MG ZS (7kW Single-Phase Mode) at a 50% duty cycle (3,680 W average) during daylight you need roughly 4,600 W of panels, which this unit can accept.
5. Frequently Asked Questions
Can the Fox ESS EP5 Modular Hybrid run a MG4 EV / MG ZS (7kW Single-Phase Mode)?
Not reliably in the UK, Europe and Australia — our verdict is "Continuous Overload". The 7,360 W running load exceeds the 5,000 W inverter. The Sungrow SH10RS Hybrid Inverter + Battery is a compatible alternative.
How many miles of range can the Fox ESS EP5 Modular Hybrid add to a MG4 EV / MG ZS?
A full 5,180 Wh charge delivers about 4.0 kWh to the vehicle battery after inverter (85%) and on-board charger (90%) losses — roughly 14 miles at 3.5 mi/kWh. Charging at this profile is not possible on this unit without reducing current or changing voltage.
What breaker and wire size do I need to connect a MG4 EV / MG ZS (7kW Single-Phase Mode) to the Fox ESS EP5 Modular Hybrid?
At 230 V the load draws 32.0 A. Under BS 7671 / IEC 60364 the protective device must be at least the design current (Ib ≤ In ≤ Iz), so use a 32 A MCB with RCD protection on 4.0 mm² copper cable for runs up to 7.5 m (1.0% voltage drop). Connection: Type 2 EVSE · IEC 60309 32A Commando.
How long does it take to recharge the Fox ESS EP5 Modular Hybrid with solar panels?
With an 800 W array and an 80% real-world harvest factor, a full recharge takes about 8.1 hrs of peak sun (1.8 days at 4.5 peak-sun-hours). At its maximum 6,500 W solar input it drops to 60 min.
Methodology & safety note
Specifications come from manufacturer datasheets in our open dataset; ampacity and resistance values follow NEC Table 310.16 and Chapter 9 Table 8, and BS 7671 Appendix 4. Calculations assume copper conductors, 30 °C ambient and no bundling derating. Inverter-to-panel connections require a listed transfer switch or interlock to prevent back-feeding the grid. These results are an engineering estimate, not a substitute for a licensed electrician and local permit. See our methodology and safety disclaimer.