Is Switzerland Going Back Contact?

Why It Matters

Higher efficiency modules and integrated storage lower the levelized cost of energy, reshaping the economics of Swiss rooftop solar and influencing global module manufacturers.

Key Takeaways

• BC modules >50% Swiss market 2025
• Efficiency outweighs price in rooftop PV decisions
• AC/DC ratio fell to ~90%, easing grid impact
• Huawei inverter share reaches ~50% in Switzerland
• Storage offered on 70% of new PV systems 2025

Pulse Analysis

Switzerland’s residential solar landscape is rapidly converging on back‑contact technology, not because of a brand preference but due to the efficiency ceiling it offers. Aiko Solar and Longi’s combined market share surpasses half of all rooftop installations, underscoring how module performance now outweighs cost in a market where PV hardware can represent less than 10% of total project spend. This efficiency premium aligns with the broader European push for higher‑output panels, prompting Chinese manufacturers to double‑down on BC designs while local players like Megasol scramble to keep pace.

System architecture is evolving alongside module choices. The AC/DC ratio’s dip from 95% in 2017 to roughly 90% today reduces peak power stress on the grid, a subtle yet critical shift as more east‑west and north‑facing roofs come online. Concurrently, Huawei’s inverter dominance—approaching a 50% share—reflects installer confidence in its grid‑support features, while multi‑MPPT configurations (two to four strings) become standard to maximize energy harvest from less‑optimal roof orientations. These design trends collectively improve the levelized cost of energy and future‑proof installations against tightening grid‑access regulations.

Battery storage is the third pillar reshaping Swiss PV economics. Installations rose from 45,000 in 2023 to 65,000 in 2024, and by 2025 over 70% of new systems were offered with a storage option, even though only one‑third of end users opt‑in. The surge is driven by falling battery prices and the desire to hedge against variable electricity tariffs, effectively turning rooftop PV into a dispatchable asset. As storage penetration deepens, we can expect further reductions in LCOE, stronger resilience against grid constraints, and a compelling case for continued investment in high‑efficiency, back‑contact modules across Europe.