Huawei is the third-largest commercial solar inverter brand in the UK after SolarEdge and Fronius, with rapidly growing market share since 2020 driven by competitive pricing on the SUN2000 commercial range, mature battery storage integration via Smart String ESS, and a free monitoring platform (FusionSolar) that competes head-to-head with SolarEdge MySolarEdge and Fronius Solar.web. Globally, Huawei has been the world's largest PV inverter manufacturer by volume since 2015 — UK adoption lagged for procurement and policy reasons but commercial uptake has accelerated materially in the last three years. This guide covers the FusionSolar platform, what it monitors, the SUN2000 inverter range, the Smart Module Controller for panel-level data, Smart String ESS battery integration, multi-site portfolio dashboards, and how Huawei compares to SolarEdge and Fronius for UK commercial sites.
FusionSolar platform overview
FusionSolar is Huawei's web and mobile platform for solar PV and battery storage monitoring. Architecture: every Huawei SUN2000 inverter accepts a Smart Dongle in a dedicated slot — either the WLAN-FE dongle (Wi-Fi plus Ethernet) for sites with local network, or the 4G dongle for remote sites. The dongle pushes data to the FusionSolar cloud at 5-minute resolution. Web portal at fusionsolar.huawei.com and mobile app on iOS and Android pull from the cloud for display.
The platform monitors the entire range of Huawei SUN2000 string inverters from 3 kW residential single-phase through to 1 MW+ commercial three-phase, plus the Smart String ESS battery storage range from 5 kWh to 1 MWh+. Data resolution is 5-minute live for the most recent 24 hours, 15-minute aggregations for historical, and lifetime data retention as standard.
Key features for commercial customers
Real-time generation monitoring. Live kW and today/this-month/lifetime kWh on the home dashboard, with breakdown by inverter when multiple are paralleled.
Intelligent string monitoring. SUN2000 inverters detect underperforming strings using AI-trained baseline modelling — the platform flags a string operating below expected even when absolute output is still substantial, catching subtle issues before they become material yield losses.
Smart String ESS battery monitoring. When paired with Huawei battery storage, FusionSolar shows state of charge, charge/discharge cycles, dispatch schedule, and predicted vs actual battery utilisation. The dispatch schedule view is unique to Huawei — the AI controller publishes the next 24 hours of planned charge and discharge based on PV forecast, load forecast, and tariff structure, viewable directly in the dashboard.
Fault diagnosis with auto-detection. The platform auto-classifies common faults (DC isolation drift, MPPT tracking error, temperature derating, anti-islanding trip) and proposes remediation steps. For installers running O&M contracts this reduces diagnostic time materially.
AI-powered yield forecasting. 24-hour and 7-day generation forecasts based on local weather data, used for demand-response and battery dispatch optimisation. Particularly valuable for sites participating in flexibility markets.
Smart Module Controller for panel-level data
Smart Module Controller (SMC) is Huawei's answer to the SolarEdge optimiser. It is a small device bolted to each panel frame, connected via the panel's existing junction box. Each SMC reports panel-level voltage, current, power, and temperature back to the inverter. With SMC fitted, FusionSolar shows per-panel data identical in resolution to SolarEdge MySolarEdge — the difference is SMC is optional in Huawei's architecture, where SolarEdge optimisers are mandatory.
When to fit SMC: complex shading sites (SMC enables panel-level MPPT tracking which adds 3 to 8 percent yield versus string MPPT under partial shading), safety-critical sites (SMC enables module-level rapid shutdown to NEC 690.12 / IEC 60364-7-712 fire safety standards — relevant for some UK applications under emerging fire safety regulation), warranty-sensitive sites (per-panel data accelerates panel manufacturer warranty claims).
When not to fit SMC: simple unshaded commercial rooftops where string MPPT is sufficient and the £30-45 per panel SMC cost is hard to justify against incremental yield. Most warehouse and distribution centre rooftops fall into this category — string-level monitoring is enough.
Compatible with: SUN2000-MA inverter range (mid-power three-phase from 30kW to 100kW). Older SUN2000 inverters do not support SMC integration; check at procurement.
Benefits for commercial portfolios
Multi-site portfolio dashboard. Aggregates all sites under one organisational view, filterable by region, inverter model, status, and alert state. Critical for installers running 50+ site portfolios.
Role-based access control. Site owner, facilities manager, O&M provider, and accountant all get different access scopes from a single account configuration. Cleaner than the SolarEdge approach which historically required separate accounts.
Automated reports. Weekly and monthly PDF reports auto-generated, branded with your logo for re-distribution to tenants or stakeholders. ESG and sustainability disclosure reports include lifetime CO2 avoided using BEIS conversion factors.
API for ERP/BI integration. REST API exposed at openapi.fusionsolar.huawei.com supports integration with Power BI, Tableau, SAP Energy Management, and custom dashboards. Authentication is OAuth-based with API key issuance from the platform.
UK availability and certification
Huawei SUN2000 commercial inverters are fully approved for UK commercial deployment. The certification stack:
MCS-listed. 30+ Huawei inverter models on the current MCS database covering 3kW through 330kW. MCS listing is the prerequisite for SEG eligibility — see /seg-tariff-comparison/.
G98 and G99 type-tested. ENA Engineering Recommendations G98 (sub-3.68 kW per phase) and G99 (above) — Huawei has type-test certificates with all UK DNOs. See /g98-application/ and /g99-application/.
NSAI certificated. Equipment certification by the National Standards Authority of Ireland which is widely accepted by UK DNOs as supporting evidence for grid connection approval.
CE / UKCA marked. Standard equipment marking for sale in the UK and EU.
Procurement caveat: some critical national infrastructure customers (UK government departments, defence-related sites, large data centres serving CNI) operate Huawei restrictions on procurement policy grounds. Most commercial customers have no such restriction. Check your specific organisational policy if relevant.
Comparison vs SolarEdge MySolarEdge and Fronius Solar.web
Per-panel data. SolarEdge: native (every install). FusionSolar: optional via Smart Module Controller. Fronius: not available — string-level only.
Battery storage integration. Huawei Smart String ESS is the most polished battery-PV integration in our experience — the dispatch schedule visualisation is unique. SolarEdge StorEdge is mature and stable. Fronius needs third-party BYD/LG Chem batteries which add integration complexity.
Free vs paid tiers. FusionSolar: fully free including portfolio dashboards. Solar.web: Premium tier costs £3-5/inverter/year. MySolarEdge: free for site owner, organisational dashboard requires SolarEdge professional partner account on installer side.
Mobile app. FusionSolar has the cleanest UI of the three in our experience.
API maturity. SolarEdge documentation is the most mature, FusionSolar is good and improving, Fronius sits in the middle.
Hardware reliability. All three within 0.3 to 0.6 percent per year failure rate at 5+ years field service. Differentiation is at the edges — Huawei has had specific firmware bug episodes in 2023-2024, Fronius has occasionally been slow on RMA replacements, SolarEdge has had isolated optimiser early-life failures resolved by warranty. None of the three has a fatal reliability problem.
Setup process
Step 1: Smart Dongle install. At inverter commissioning, fit the WLAN-FE dongle (£40-60) for sites with available Ethernet/Wi-Fi or the 4G dongle (£100-150 plus £15-25/month SIM cost) for remote sites. Dongle plugs into the dedicated slot on the inverter front.
Step 2: Network configuration. If Ethernet, plug into your switch and the inverter pulls DHCP automatically. If Wi-Fi, follow the inverter front panel wizard to enter SSID and password. If 4G, the dongle auto-connects with a pre-installed SIM.
Step 3: FusionSolar account creation. Visit fusionsolar.huawei.com or download the FusionSolar app. Register an account with email verification.
Step 4: Plant claim. Enter the plant code printed on the inverter front sticker. The platform validates and adds the plant to your account. Multi-inverter sites: enter each plant code once, the platform groups them into a single plant view.
Step 5: Configure alerts and reports. In the Settings tab, configure alert thresholds, email recipients, and report schedules. Allow 7-14 days of operating data before tuning thresholds — the AI baselining stabilises in the first week.
Smart String ESS battery integration — the standout feature
Where Huawei differentiates most strongly versus SolarEdge and Fronius is in battery storage integration. Huawei Smart String ESS is purpose-designed to pair with SUN2000 inverters — the architecture, communications protocol, and dispatch optimiser are unified rather than bolted together as in most competing battery-PV combinations. Three specific advantages:
String architecture eliminates single-cell failure risk. Conventional batteries put all cells on a single DC bus — one failed cell takes down the whole battery. Smart String ESS gives each battery rack its own DC/DC converter, so a failed cell only takes down the rack containing it. Remaining racks continue operating at reduced capacity. For commercial sites where battery downtime is operationally costly (data centres with UPS-replaced batteries, manufacturing with critical loads), this redundancy is meaningful.
AI-optimised dispatch. The FusionSolar dispatch optimiser ingests local weather forecasts, half-hourly tariff signals, building load patterns, and SEG export rates to compute the optimal next-24-hours charge/discharge schedule. Outputs are visible in the FusionSolar dashboard so site owners can see the AI\'s plan and override when needed. Particularly valuable on time-of-use tariffs (Octopus Outgoing Agile, half-hourly DUoS exposure — see /tnuos-duos-charges-2026/).
End-to-end warranty. Huawei warrants the inverter, battery, and Smart String integration as one system. SolarEdge StorEdge does the same. Fronius with third-party batteries has split warranty paths — issues at the integration layer can fall between Fronius and the battery manufacturer. Single-vendor warranty simplifies claim resolution.
For commercial customers actively planning battery storage at the install stage, Huawei is consistently the cleanest integration we specify in 2026. See /services/battery-storage/ for broader battery context.
Authority resources
Huawei FusionSolar platform: fusionsolar.huawei.com. Huawei UK PV product range: Huawei UK Solar. MCS-listed installer database: MCS Certified. ENA Engineering Recommendations G98 and G99: Energy Networks Association.
Related decision pages
Best commercial solar inverters for the platform selection comparison. Solar panel monitoring for the broader monitoring picture. SolarEdge monitoring for the SolarEdge comparison. Fronius Solar.web for the third major platform. Battery storage for Smart String ESS integration. Maintenance for retainer-based monitoring oversight. SEG tariff comparison. G98 application and G99 application. Commercial solar PV. Are commercial solar panels worth it.
Huawei FusionSolar — common questions
How do I set up Huawei FusionSolar on my commercial inverter?
Every Huawei SUN2000 inverter ships with a Smart Dongle slot — fit either the WLAN-FE Wi-Fi/Ethernet dongle (for sites with available local network) or the 4G dongle (for remote sites without network). Power the inverter, then on the FusionSolar app or web portal at fusionsolar.huawei.com create an account, claim the inverter using its plant code (printed on the inverter front sticker), and the platform auto-detects all paralleled inverters on the site. Setup time is typically 20 minutes per inverter at commissioning. Most installers do this at handover and transfer plant ownership to you as the site owner — historical commissioning data transfers with the ownership.
Is FusionSolar free for commercial customers?
Yes — FusionSolar is free for both installer and end-user across all tiers. Unlike Fronius which charges for the Premium tier, Huawei includes multi-site portfolio dashboards, professional reporting, and API access in the standard offering. The pricing model is built into the inverter — Huawei prices their inverters competitively with Fronius and SolarEdge precisely because monitoring is free, the platform pays for itself by reducing service call costs across the install base. This is a meaningful advantage for installers running large portfolios on Huawei.
What is the Huawei Smart Module Controller and is it worth fitting?
Smart Module Controller (SMC) is a panel-level optimiser device, similar to a SolarEdge optimiser. Each SMC bolts to a panel frame and reports the panel’s individual voltage, current, and power back to the inverter. Without SMC, FusionSolar gives string-level data (similar to Fronius). With SMC, FusionSolar gives panel-level data (similar to SolarEdge). Cost: roughly £30-45 per panel installed, equating to a 4-7 percent uplift on the system cost. Worth fitting on sites with complex shading (where panel-level MPPT tracking adds yield), on safety-critical sites (SMC enables module-level rapid shutdown for fire compliance), and on warranty-sensitive sites (per-panel data validates panel manufacturer warranty claims). Not worth fitting on simple unshaded warehouse rooftops where string-level monitoring is sufficient.
Does FusionSolar work with Huawei battery storage?
Yes — Huawei Smart String ESS (Energy Storage System) battery integrates seamlessly with FusionSolar. The platform shows battery state of charge, charge/discharge cycles, lifetime energy throughput, and (importantly) the optimised dispatch schedule that the AI controller has computed for the next 24 hours. Smart String ESS uses a string architecture similar to the inverter side — each battery rack has its own DC/DC converter so a single failed cell does not take down the whole battery. Available in 5kWh residential through to 1MWh+ commercial sizes. See /services/battery-storage/ for the wider battery context.
How does FusionSolar compare to SolarEdge and Fronius?
On the monitoring layer all three platforms are credible. Headline differences: SolarEdge gives true panel-level data as standard (every panel has an optimiser); FusionSolar gives panel-level data only when Smart Module Controllers are fitted as an optional add-on; Fronius gives string-level data only. For battery integration, FusionSolar with Smart String ESS is the most polished battery-PV integration of the three; SolarEdge StorEdge is mature; Fronius requires a third-party BYD or LG Chem battery. For multi-site portfolios all three offer aggregating dashboards. For mobile app polish, FusionSolar has the cleanest UI in our experience. Inverter hardware reliability is comparable across all three at 0.3 to 0.6 percent per year failure rate at 5+ years.
Is Huawei kit MCS-listed and approved for UK G98/G99 grid connections?
Yes. Huawei SUN2000 inverters are MCS-listed (current MCS database lists 30+ Huawei inverter models from 3kW residential through to 330kW utility-scale), G98 and G99 type-tested by the Energy Networks Association, and NSAI-certificated. The full UK commercial range is approved for grid connection. Huawei has been actively investing in UK certification since 2019 and the certification list is now comparable to Fronius and SolarEdge. The one caveat: some UK government departments and critical national infrastructure customers (defence, large data centres) restrict Huawei kit on procurement policy grounds — check your customer policy if you are installing for those segments.