Top 10 solar panel types

How we ranked them

1. Power per square metre (30 %) – More power = faster pay‑back on your limited roof space.
2. Installed cost & pay‑back time (25 %) – Lower up‑front spend or quicker return scored higher.
3. Cloudy‑day output (15 %) – British weather isn’t Ibiza; panels that cope with grey skies score better.
4. Fit for different roof types (10 %) – Weight, flexibility and looks all matter.
5. Warranty & toughness (10 %) – Storms, salty air and 25 years of drizzle need rugged gear.
6. Eco‑credentials (10 %) – Lower carbon footprint and easy recycling help with ESG reports.

Each panel got 1–5 points in every category; higher total = higher ranking.

1. High‑Efficiency Mono Panels (n‑type “TOPCon”)

• What they are: Top‑end silicon modules that squeeze more power into the same roof area.
• Best for: Large flat roofs on warehouses, supermarkets and light‑industrial units.
• Why #1: Highest power for the money, strong 25‑year warranties, only a small price jump over standard panels.
• Pros: Up to ~23–25 % efficiency; quick 4–6 year pay‑back on typical commercial roofs; slow annual power loss.
• Cons: Needs a reputable installer to get the earthing right.
• Typical cost: Roughly £950 – £1 150 per kW on 100 kW‑plus systems.

2. Bifacial Glass‑Glass Panels

• What they are: Double‑glass modules that also use light bouncing off the roof for bonus power.
• Best for: White or light‑coloured roofs, car‑port canopies, ground‑mount arrays over pale gravel.
• Why #2: Up to 10 % extra energy without extra roof space; rugged build.
• Pros: Better winter and early/late‑day output; very long (often 30‑year) performance guarantees.
• Cons: About 10 % dearer and only shines if the surface below reflects light.
• Typical cost: About £1 000 – £1 250 per kW.

3. Heterojunction (HJT) Panels

• What they are: Silicon cells layered with ultra‑thin coatings that boost efficiency.
• Best for: Offices and data‑centres with tight roof space and strict ESG targets.
• Why #3: Very high efficiency and great hot‑weather performance, but pricier and fewer UK suppliers.
• Pros: Around 24 % efficiency; sleek all‑black look; loses less power on hot days.
• Cons: Typically a 10 % cost premium and longer lead times.
• Typical cost: Roughly £1 050 – £1 300 per kW.

4. Standard Mono PERC Panels – the Work‑horse

• What they are: Today’s mainstream silicon module, delivering ~20–22 % efficiency.
• Best for: SMEs wanting proven tech at the lowest price.
• Why #4: Great value, but newer n‑type models beat it on lifetime output.
• Pros: Cheapest £/kW, huge installer network, solid 25‑year product warranties.
• Cons: Slightly lower performance on very overcast days.
• Typical cost: Around £850 – £1 050 per kW.

5. Thin‑Film Cadmium Telluride (CdTe)

• What they are: Super‑thin semiconductor layers on glass—lighter than silicon.
• Best for: Very large, weight‑sensitive roofs in Scotland or the North where clouds rule.
• Why #5: Shines in low light and cool weather but needs careful recycling at end‑of‑life.
• Pros: Keeps producing when skies are grey; low embodied carbon.
• Cons: Fewer UK suppliers; must send panels to a specialist recycler.
• Typical cost: About £900 – £1 100 per kW.

6. Perovskite‑Silicon Tandems (Next‑Gen)

• What they are: Two solar layers stacked together; first commercial units hit the market in late 2024.
• Best for: Early‑adopter corporates wanting headline‑grabbing innovation.
• Why #6: Future‑proof efficiency but limited UK stock and a short performance track‑record.
• Pros: Up to 20 % more power than standard silicon.
• Cons: Long‑term durability still being proven; pricing premium uncertain.
• Typical cost: Roughly £1 300 – £1 600 per kW.

7. Flexible CIGS Thin‑Film

• What they are: Ultra‑light panels that can curve and even stick onto metal sheets.
• Best for: Curved factory roofs, truck or container tops, lightweight canopies.
• Why #7: Unique flexibility but lower efficiency and shorter warranties.
• Pros: Under 3 kg per m²; no roof‑penetrations needed.
• Cons: About 17 % efficient; usually 20‑year guarantees.
• Typical cost: Around £1 000 – £1 300 per kW.

8. Amorphous Silicon (a‑Si) Thin‑Film

• What they are: Non‑crystalline silicon sprayed onto foil; uniform coloured finish.
• Best for: Large building façades where looks matter more than peak output.
• Why #8: Eco‑friendly and shade‑tolerant but needs twice the roof area for the same power.
• Pros: Very low embodied carbon; blends neatly into architecture.
• Cons: Only 10–12 % efficient; typical 15‑year warranties.
• Typical cost: Roughly £850 – £1 050 per kW.

9. Semi‑Transparent PV Glass

• What it is: Solar film embedded in glazing, replacing normal windows or curtain‑wall glass.
• Best for: New‑build offices chasing BREEAM “Outstanding” or LEED Platinum.
• Why #9: Generates on vertical glass but expensive per watt and lower efficiency.
• Pros: Helps cut cooling loads; makes glass façades earn their keep.
• Cons: Adds 30–50 % to normal glazing cost; only 8–12 % efficient.
• Typical cost: Around £250 – £300 per m² (roughly £1 800 – £2 200 per kW).

10. Solar Roof Tiles & Slates

• What they are: Tiles or slates that act as both roof covering and solar generator.
• Best for: Shops, hotels or heritage sites where visible panels are not allowed.
• Why #10: Lovely aesthetics but the priciest option and fixed roof angle limits winter output.
• Pros: Seamless look; saves buying a separate roof if you’re re‑roofing anyway.
• Cons: 40–80 % dearer than rack‑mounted panels.
• Typical cost: About £3 000 – £4 000 per kW (so a 4 kW tile roof costs roughly £12k–£16k).

The Bottom Line

Solar technology has come a long way in a short time, and there’s never been a better moment to lock in cheaper, cleaner electricity for the next 25 years.

Talk to our experts at Perfect Sense Energy for a free, no‑obligation site assessment and tailored quote. Our team handles everything from the first roof survey through installation and ongoing monitoring so you can focus on running the business while the sun does the work!