Why Swiss Solar Quotes Vary So Much
A CHF 10,000 gap between two quotes for 'the same system' seems alarming. But solar quotes in Switzerland bundle many variables that are rarely spelled out clearly:
- Panel brand tier and efficiency
- Inverter type and brand
- Battery inclusion or exclusion
- Scaffolding and roof access costs
- Electrical installation complexity
- Monitoring setup and commissioning
- Pronovo EIV administration
- Warranty terms and service commitments
- Installer overhead, reputation premium, and margin
Understanding each line item is the only way to make a fair comparison.
A Typical Quote Breakdown for a 10 kWp System
| Line item | Budget quote (CHF 18,000) | Premium quote (CHF 28,000) | What drives the difference |
|---|---|---|---|
| Solar panels (30 × 380Wp) | CHF 7,200 (generic Tier 2) | CHF 11,400 (Meyer Burger / 3S Swiss Solar / top-tier Tier 1) | Brand, efficiency, warranty |
| Inverter (10 kW string) | CHF 1,800 (Solplanet / Deye) | CHF 3,200 (Fronius / SMA / SolarEdge) | Brand, warranty, Swiss service |
| Mounting system | CHF 1,200 (standard aluminium) | CHF 2,000 (Schletter / K2 with wind calc) | Engineering, alpine-rated hardware |
| DC cabling and connectors | CHF 600 | CHF 1,100 | Cable gauge, connector brand |
| AC installation and grid connection | CHF 1,500 | CHF 2,500 | Complexity, earthing, AC protection |
| Scaffolding / roof access | CHF 1,200 | CHF 2,200 | Roof complexity, access difficulty |
| Commissioning and monitoring setup | CHF 500 | CHF 1,200 | Monitoring hardware, setup time |
| Pronovo EIV registration | CHF 0 (DIY) | CHF 400 (included) | Service inclusion |
| Workmanship warranty | 2 years | 10 years | Risk transfer to installer |
| Total | CHF 14,000 (before EIV) | CHF 24,000 (before EIV) | — |
| After CHF 7,000 Pronovo EIV | CHF 7,000–11,000 | CHF 17,000–21,000 | — |
Note: Actual figures vary by canton, roof type, and installer. These are illustrative breakdowns.
Panel Quality: The Biggest Single Variable
The panel market divides broadly into three tiers:
Tier 1 premium (Meyer Burger, 3S Swiss Solar, Q Cells, REC): Higher efficiency (21–23%), longer product warranty (up to 30 years), bankability for finance. Swiss-made options (Meyer Burger, 3S) carry an additional 'buy local' premium and shorter supply chain.
→ Numbers speak louder: calculate your annual solar return and take the guesswork out.
Tier 1 standard (JA Solar, Jinko, Longi, Trina): Well-manufactured, 20–21% efficiency, 12-year product warranty standard. Good value-to-quality ratio. Used by most mid-market Swiss installers.
Tier 2 (less established brands): Lower upfront cost, shorter warranties, less certain long-term service availability. May not remain on Pronovo's approved product list if the manufacturer exits the market.
Over 25 years, a panel that degrades at 0.4% per year vs 0.55% per year (a real difference between top-tier and budget panels) produces roughly 4–5% more cumulative energy — worth CHF 1,500–2,500 at current Swiss electricity prices.
Inverter: What the Brand Premium Buys
Fronius, SMA, SolarEdge, and Kostal command higher prices than Solplanet, Deye, or lower-cost alternatives. What you pay for:
- Swiss/European service network: Fronius has a service centre in Egg ZH; SMA in Germany; both have next-day replacement parts available in Switzerland
- Longer warranty: Fronius and SMA offer 5-year standard warranties; extensions to 10–20 years available
- Software updates and longevity: established brands have committed to firmware support for 10+ years
- Proven field reliability: track record of millions of units in European climates
Solplanet and Deye have improved significantly and are used by credible Swiss installers — but verify the service arrangement carefully before accepting a quote with these brands.
Questions to Normalise Before Comparing
Before comparing total prices, make sure each quote answers these questions the same way:
- Is scaffolding included or charged separately?
- Is the Pronovo EIV application handled by the installer?
- What is the workmanship warranty period?
- Are monitoring hardware and setup included?
- What is the system DC-AC ratio, and has it been optimised for your roof?
- Has a shading analysis been performed?
Once all quotes include the same scope, price differences become meaningful. A CHF 28,000 quote that includes 10-year workmanship warranty, premium panels with 30-year product warranty, and a Polysun simulation is a different product to an CHF 18,000 quote without those elements.
→ Your bill, your roof, your result — find out your solar savings now.