Solar tiles vs traditional panels: aesthetics vs efficiency

Solar tiles are roof shingles or slates with embedded photovoltaic cells. Tesla popularized them in 2016 with its Solar Roof. Do they make sense in 2026, or still just marketing?

How they work

Each tile contains silicon cells (tempered glass or shingles). Active tiles mix with passive (no cell) tiles in non-sunny zones. Wiring goes underneath. Whole array connects to a normal solar inverter.

Products in market

Tesla Solar Roof V3: benchmark, tempered glass, 70 W/tile. GAF Energy Timberline Solar: integrated in US asphalt roof. CertainTeed Apollo II: solar slate roof. SunStyle: premium Swiss tiles. Onyx Solar (Spain): PV slate roof.

Efficiency vs traditional panels

Conventional mono PERC panel: 20-22% efficiency. Tesla tiles: 13-15%. Other brand tiles: 10-15%. Per sqft of roof, tiles produce 30-50% fewer kWh. To match production you need more covered surface.

Cost compared

Traditional 5 kWp panel installed: $9000-14000. Equivalent Tesla Solar Roof (includes full roof replacement): $35000-60000 in USA. 3-4× pricier but 'includes new roof'.

When it DOES make sense

1) Current roof at end of life (needs replacement anyway). 2) Strict aesthetic restrictions (heritage area, HOA with rules). 3) High budget and aesthetics over ROI. 4) New construction projected from start.

When NOT

Roof in good condition. Limited budget. Client prioritizing ROI. Any case where traditional panel is aesthetically acceptable. Vast majority of 2026 homes: traditional panel always wins.

Compare with photovoltaic windows.