Why Monitoring Matters in Switzerland
A solar system that produces 10% below its predicted yield costs a Swiss homeowner roughly CHF 150–250 per year in lost savings — silently, without any visible fault. In Switzerland, where systems are expected to earn back their cost over 10–15 years, catching underperformance early is financially significant.
Good monitoring platforms flag inverter faults, string-level drop-offs, and communication errors before they compound into larger losses. They also satisfy Pronovo's record-keeping expectations and make it straightforward to document production for tax or cantonal incentive purposes.
The Four Major Platforms
Fronius Solar.web
Fronius, headquartered in Wels, Austria, is one of the most common inverter brands on Swiss rooftops. Its monitoring ecosystem, Solar.web, is web-based and mobile-accessible.
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- Data granularity: 5-minute resolution for production, consumption (with Fronius Smart Meter), and grid export
- Alerts: Email and push notifications for communication loss, grid faults, and inverter errors
- Swiss integration: Fronius Smart Meter pairs with most Swiss smart meters; compatible with Swisscom Energy; some grid operators accept Solar.web export for production reporting
- Battery view: Full integration with BYD HVM and Fronius own battery for state-of-charge tracking
- Strength: Stable, mature platform; local support through Fronius Switzerland in Egg ZH
- Limitation: UI is functional but not especially modern; third-party smart home integration requires Fronius Ohmpilot or API work
SolarEdge mySolarEdge
SolarEdge's optimiser-based architecture gives it module-level visibility that string inverter platforms cannot match. The mySolarEdge app exposes this advantage clearly.
- Data granularity: Module-level production data; 15-minute resolution on summary views
- Alerts: Automatic module-level fault detection; installer notifications separate from owner notifications
- Swiss integration: SolarEdge inverters are widely installed in Switzerland; the platform supports CH grid tariff structures; EV charger integration via SolarEdge EV charger
- Battery view: SolarEdge Home Battery data visible; third-party batteries not supported
- Strength: Module-level insight is genuinely useful for shade diagnosis and warranty claims
- Limitation: Platform is tied tightly to SolarEdge hardware; switching inverters means losing the monitoring history
Sungrow iSolarCloud
Sungrow has grown rapidly in Switzerland over 2024–2026, particularly in the 3–10 kWp residential segment where its SH series hybrid inverters are competitively priced. iSolarCloud is the companion platform.
- Data granularity: 5-minute resolution; EV charging, battery, and consumption data in unified view
- Alerts: Good fault detection; installer portal separated from homeowner view
- Swiss integration: iSolarCloud supports CHF tariff input for financial tracking; compatible with third-party EV chargers via Modbus; Sungrow battery and third-party BYD batteries visible
- Battery view: Native support for Sungrow SBR battery series; BYD integration documented
- Strength: Clean UI; all-in-one energy dashboard is among the best in this comparison
- Limitation: Customer support response times in German can be slower than Fronius or SolarEdge
Huawei FusionSolar
Huawei's LUNA2000 battery and SUN2000 inverter combination has a significant installed base in Switzerland. FusionSolar is the management portal.
- Data granularity: Near-real-time data; FusionSolar supports both homeowner and installer layers
- Alerts: Comprehensive fault library; automatic degradation detection
- Swiss integration: FusionSolar works with Huawei's iCharger (EV charging); compatible with third-party meters; some Swiss grid operators flag Huawei hardware for data sovereignty reasons — verify with your installer
- Battery view: LUNA2000 fully integrated; detailed cell-level diagnostics via installer portal
- Strength: Most data-rich platform; AI-based yield optimisation claims (Huawei Smart PV)
- Limitation: Data sovereignty concerns about cloud storage in China are a real consideration for some Swiss homeowners and businesses
Platform Comparison Table
| Feature | Fronius Solar.web | SolarEdge mySolarEdge | Sungrow iSolarCloud | Huawei FusionSolar |
|---|---|---|---|---|
| Module-level data | No | Yes | No | No |
| Battery integration | BYD, Fronius | SolarEdge only | Sungrow, BYD | LUNA2000 |
| EV charger data | Via Ohmpilot | SolarEdge EV | Third-party Modbus | iCharger |
| Data stored in | EU (Fronius, AT) | EU (SolarEdge, IL) | China/EU hybrid | China |
| German app UI | Yes | Yes | Yes | Yes |
| Open API | Yes (limited) | Yes (paid) | Yes | Yes (limited) |
| Offline fallback | Web browser | App only | App only | App only |
Practical Tip: Download the Weekly Report
All four platforms offer automated weekly or monthly summary reports by email. Enable these on day one — they create an automatic paper trail of your system's performance that is useful for warranty claims, cantonal incentive reporting, and tracking against the Polysun yield simulation your installer provided.