Engineering report · reviewed against NEC 2026 & BS 7671:2018+A2
Engineering Breakdown: Running a Vaillant aroTHERM Plus Air Source Heat Pump (7kW) on the Anker SOLIX C1000
When pairing the Anker SOLIX C1000 (1,056 Wh LiFePO4 capacity, 1,800 W continuous, 2,400 W surge) with a Vaillant aroTHERM Plus Air Source Heat Pump (7kW) (2,300 W running, 3,500 W starting surge), the system operates at 128% 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 10 A MCB and 1.5 mm² copper, terminated at a Hardwired via DP isolator · IEC 60309 32A connection.
1. Compatibility Verdict & Inverter Load Utilization
In UK/EU/AU 230 V mode the Vaillant aroTHERM Plus Air Source Heat Pump (7kW) loads the Anker SOLIX C1000's inverter to 128% of its 1,800 W continuous rating and 146% of its 2,400 W surge rating. Because continuous demand exceeds the inverter by 500 W, the unit will shut down within seconds of starting the load. The Mango Power E (3.5kWh LFP) is the smallest compatible upgrade.
| Check | Load requires | Anker SOLIX C1000 provides | UK/EU/AU |
|---|---|---|---|
| Continuous output | 2,300 W | 1,800 W | Fail |
| Start-up surge | 3,500 W | 2,400 W | Fail |
| Voltage | 230 V | 230 V | Pass |
| Connection | Hardwired via DP isolator · IEC 60309 32A | Schuko CEE 7/3 / BS 1363 13A outlets |
Air source heat pumps such as this one use inverter-driven compressors that ramp up gradually, so their start-up demand (3,500 W, 1.5× running) is far gentler than a fixed-speed air conditioner. The real challenge is energy, not surge: in a cold snap a heat pump can run for most of the day, and defrost cycles add short peaks. At 2,300 W, the Anker SOLIX C1000 would supply about 23 min of continuous heating from a full battery — so in practice batteries are used to shift cheap off-peak or solar energy into the evening, not to heat a home through a multi-day outage. UK installations are made under BS 7671 and MCS standards, and the local network operator (DNO) must be notified.
As a portable power station, the Anker SOLIX C1000 integrates the LiFePO4 battery, inverter, MPPT solar controller and AC outlets in one chassis, so it can be wheeled to the load or connected to a transfer switch through its NEMA 5-20R outlet.
Compatible alternative: the Mango Power E (3.5kWh LFP) with the Vaillant aroTHERM Plus Air Source Heat Pump (7kW) 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 1,056 Wh rating to about 898 Wh of deliverable AC energy (85% system efficiency). Duty cycle is the share of each hour the load actually draws its running power — thermostats, pressure switches and intermittent use all lower it.
| Duty cycle | Average draw | Runtime (no solar) | Energy per 24 h |
|---|---|---|---|
| 25% | 575 W | 1.6 hrs | 13.8 kWh |
| 50% | 1,150 W | 47 min | 27.6 kWh |
| 65% | 1,495 W | 36 min | 35.9 kWh |
| 100% | 2,300 W | 23 min | 55.2 kWh |
Even at a 50% duty cycle the battery lasts 47 min, 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 10.0 A, so a 10 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) | 10 A | 1.5 mm² | 0.79% |
| 15 m (49 ft) | 10 A | 1.5 mm² | 1.58% |
| 22.5 m (74 ft) | 10 A | 1.5 mm² | 2.37% |
| 30 m (98 ft) | 10 A | 2.5 mm² | 1.93% |
Moving the Anker SOLIX C1000 from 7.5 m to 30 m away forces the conductor up from 1.5 mm² to 2.5 mm² — park the unit as close to the load as ventilation and weather protection allow.
4. Solar Array Recharge Time Breakdown
The Anker SOLIX C1000 accepts up to 600 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% |
|---|---|---|---|---|
| 400 W | 320 W | 3.3 hrs | 0.7 | −830 W |
| 600 W | 480 W | 2.2 hrs | 0.5 | −670 W |
A typical 600 W portable array refills the battery in about 2.2 hrs of strong sun, while maxing out the 600 W input cuts that to 2.2 hrs. To fully offset the Vaillant aroTHERM Plus Air Source Heat Pump (7kW) at a 50% duty cycle (1,150 W average) during daylight you need roughly 1,450 W of panels, which exceeds this unit's 600 W input limit — solar can slow the drain but not eliminate it.
5. Frequently Asked Questions
Can the Anker SOLIX C1000 run a Vaillant aroTHERM Plus Air Source Heat Pump (7kW)?
Not reliably in the UK, Europe and Australia — our verdict is "Continuous Overload". The 2,300 W running load exceeds the 1,800 W inverter. The Mango Power E (3.5kWh LFP) is a compatible alternative.
How long will the Anker SOLIX C1000 run a Vaillant aroTHERM Plus Air Source Heat Pump (7kW)?
With 1,056 Wh of capacity and 85% inverter efficiency, expect about 23 min of continuous operation and 47 min at a 50% duty cycle — theoretical figures, since the inverter cannot actually sustain this load. Adding solar input during the day extends this further.
What breaker and wire size do I need to connect a Vaillant aroTHERM Plus Air Source Heat Pump (7kW) to the Anker SOLIX C1000?
At 230 V the load draws 10.0 A. Under BS 7671 / IEC 60364 the protective device must be at least the design current (Ib ≤ In ≤ Iz), so use a 10 A MCB with RCD protection on 1.5 mm² copper cable for runs up to 7.5 m (0.8% voltage drop). Connection: Hardwired via DP isolator · IEC 60309 32A.
How long does it take to recharge the Anker SOLIX C1000 with solar panels?
With an 600 W array and an 80% real-world harvest factor, a full recharge takes about 2.2 hrs of peak sun (0.5 days at 4.5 peak-sun-hours). At its maximum 600 W solar input it drops to 2.2 hrs.
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.