What FoxESS inverter models are available?

FoxESS offers: H1 Series (3–6 kW residential hybrid, single-phase), AC1/AC3 (3–12 kW AC-coupled retrofit battery inverter), AIO H3 (12 kWh all-in-one inverter + battery unit), and T-Series (5–25 kW commercial 3-phase string inverter). All carry a 10-year warranty and FoxCloud monitoring is included.

Is FoxESS compatible with Smart Export Guarantee (SEG) in the UK?

Yes. FoxESS H1 Series meets UK G98/G99 grid connection standards and is MCS certified, making it eligible for Smart Export Guarantee registration. You can export surplus solar electricity at 4–15p/kWh depending on your energy supplier's SEG rate. The H1 includes built-in export limiting to comply with DNO requirements.

What batteries are compatible with FoxESS H1 hybrid inverter?

FoxESS H1 Series is compatible with Pylontech US5000/Force H2, BYD Battery-Box Premium HV, and Triple Power/Solis LFP batteries via CAN bus. Battery management is handled automatically. Pylontech US5000 at ~$350/kWh is typically the most cost-effective option for FoxESS H1 installs.

Does FoxESS support Octopus Intelligent tariff for battery charging?

Yes. FoxESS H1 and AIO H3 support Octopus Energy's Agile and Intelligent tariffs via Fox Cloud API integration as of 2025. The inverter charges the battery automatically during cheap overnight periods (5–10p/kWh) and discharges during expensive peak times, potentially saving £300–600/year additional savings on top of solar export income for a 10 kWh battery.

FoxESS Inverter Calculator

UK/EU popular hybrid inverter — enter kWp, system type (H1 hybrid, AC1/AC3 retrofit, AIO H3 all-in-one, or T-Series commercial 3-phase), and battery brand (Pylontech/BYD/Triple Power) to get system cost, self-consumption rate, Smart Export Guarantee eligibility, and FoxCloud monitoring details.

System inputs

System size (kWp)?

kWp

System type?

Battery brand?

FoxESS inverter results

Smart Export Guarantee (SEG) ready — export surplus at 4–15p/kWh via UK energy suppliers

Recommended model

H1 Series — 3–6 kW residential hybrid

UK/EU bestseller — residential single-phase hybrid with DC-coupled battery, export limiting, Smart Export Guarantee ready

Metric	Value
System size	4.00 kWp
Inverter model	H1 Series — 3–6 kW residential hybrid
Peak efficiency	97.6%
Phase	Single-phase
Battery	6.0 kWh — Pylontech US5000 / Force H2
Battery cost	~$2,100
Inverter cost only	$560 – $720
Total system cost range	$3,815 – $4,465
Net cost after 30% ITC	$2,898
Year-1 production	5,842 kWh/yr
Self-consumption (with battery)	~67% of solar used on-site
Warranty	10-yr standard (FoxCloud monitoring included)
FoxCloud monitoring	Real-time yield, remote firmware updates, EV charger integration

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How to Use This Calculator

Enter your system size and type

Enter your solar array size in kWp and select the FoxESS system type that matches your situation. The H1 Series (3–6 kW) is the flagship residential hybrid — it's the most popular FoxESS product in the UK and EU markets, Smart Export Guarantee ready, and supports DC-coupled battery storage. The AC1/AC3 retrofit option adds a separate AC battery inverter to an existing solar system without replacing the original inverter. The AIO H3 is an all-in-one box that integrates a 3–6 kW inverter with 12 kWh of battery in a single wall-mounted unit. The T-Series (5–25 kW) is FoxESS's commercial 3-phase string inverter.

Choose your battery brand

FoxESS H1 and AC1/AC3 are compatible with Pylontech (US5000, Force H2), BYD (Battery-Box Premium HV), and Triple Power LFP batteries via CAN bus. The calculator recommends a battery size based on your system kWp (roughly 1.5× daily solar production for overnight coverage) and shows cost per kWh for each brand. The AIO H3 includes its own integrated battery — no separate battery selection needed.

Read your results

Outputs include: recommended model, inverter cost range ($0.12–0.20/W), total system cost with panels and battery, net cost after ITC, year-1 production, self-consumption rate with battery, FoxCloud monitoring details, and Smart Export Guarantee eligibility for UK installs.

The Formula

Inverter cost = kWp × 1000 × $/W (FoxESS: $0.12–0.20/W) Battery capacity = kWp × 1.5 (kWh recommended for overnight storage) Battery cost = capacity_kWh × $/kWh (Pylontech ~$350, BYD ~$420, Triple Power ~$380) AIO H3 battery = 12 kWh integrated @ ~$420/kWh Total cost = inverter + panels + battery + installation Net cost = total × (1 − 0.30 ITC) Year-1 production = kWp × 5 PSH × 365 × efficiency × 0.82 system derate Self-consumption = 55% + (battery_kWh × 2%) — capped at 85% UK SEG export rate: 4–15p/kWh depending on supplier tariff

Example: UK 4 kWp H1 Hybrid with Pylontech

FoxESS H1-3.7-E + 6 kWh Pylontech — typical UK home install

Solar array4 kWp → 10 × 400W panels

InverterFoxESS H1 Series 3.7–5 kW hybrid

Battery6 kWh Pylontech US5000 @ ~$2,100

Inverter cost4,000W × $0.16/W = $640

Panel cost~$1,400

Total before ITC~$4,500

Net after 30% ITC~$3,150

Self-consumption rate~67% (40% baseline + battery boost)

SEG export value33% exported @ ~8p/kWh

FoxESS H1 is one of the most popular hybrid inverters installed by UK solar companies in 2024–2025, partly due to the favorable price point and solid FoxCloud monitoring. The H1 supports both 1-phase and 3-phase meters, covers the UK G98/G99 grid connection standards, and works with Octopus Intelligent and other smart tariffs for battery arbitrage charging overnight at low rates.

FAQ

Is FoxESS a good inverter brand for UK installs? ▼

FoxESS is a Chinese inverter manufacturer headquartered in Jiangsu with a UK office (FoxESS Europe). Their H1 Series has been one of the fastest-growing residential inverters in the UK market since 2022, supported by G98/G99 MCS certification, DNO-compliant export limitation, and Smart Export Guarantee compatibility. UK installer forums (Solar Energy UK, Napit, etc.) consistently rate FoxESS H1 as reliable with a failure rate well below 1% per year based on aggregated monitoring data. FoxESS offers a 10-year warranty through UK distribution partners.

What is the FoxESS AC1/AC3 and who is it for? ▼

The FoxESS AC1 (single-phase, 3–6 kW) and AC3 (3-phase, 6–12 kW) are AC-coupled battery inverters designed to retrofit battery storage to an existing solar system — regardless of who made the original inverter. They connect on the AC side, so your existing SolarEdge, SMA, or any other grid-tie inverter remains untouched. The AC1/AC3 manages battery charging and discharging, export limiting, and time-of-use optimization. It's the cleanest way to add 5–12 kWh of storage to a home that already has solar but no battery.

What is the FoxESS AIO H3 All-In-One and is it worth it? ▼

The AIO H3 integrates a 3–6 kW hybrid inverter and 12 kWh LFP battery into a single wall-mounted unit — roughly the same size as two stacked washing machines. Installation time is typically 1–2 hours less than separate inverter + battery because there's only one unit to mount and commission. The AIO H3 is ideal for new builds and retrofits where minimizing equipment footprint is important. The trade-off: if the inverter section fails, the whole unit may need to be replaced or repaired together. Cost per kWh of storage in the AIO is slightly higher than buying a separate inverter + Pylontech stack for larger systems.

Does FoxESS support Octopus Intelligent tariff / smart grid charging? ▼

Yes. FoxESS H1 and AIO H3 support Modbus and Open API integration, which third-party platforms use for smart charging. As of 2025, FoxESS has direct integration with Octopus Energy's Agile and Intelligent tariffs via the Fox Cloud API — the inverter charges the battery automatically during overnight cheap periods (often 5–10p/kWh) and discharges during expensive peak times (30–50p/kWh). This battery arbitrage can earn or save an additional £300–600/year for a 10 kWh battery system in the UK depending on the spread between cheap and peak rates.

FoxESS vs SolarEdge vs Solis for residential hybrid — comparison ▼

FoxESS H1 vs SolarEdge: SolarEdge uses optimizers on each panel (better shading handling for complex roofs), but the inverter + optimizers cost ~50–70% more than FoxESS H1 + string. FoxESS wins on price; SolarEdge wins on panel-level monitoring and shading performance. FoxESS H1 vs Solis: Both are Chinese budget-tier hybrids in the same price band ($0.14–0.18/W). Solis has a slightly larger UK installer base; FoxESS has more aggressive battery compatibility. Solis RHI series is a direct competitor — choose based on installer preference and local support availability.