Choosing solar panels in 2026 The best solar panels for UK homes
There's no single best panel. Most panels sold for UK homes in 2026 are 450 to 485 W and 21% to 24% efficient, and the gaps between good brands are small. What matters is how a panel suits your roof, the warranties, and who stands behind them.
In this guide
Types of solar panel
Nearly every home panel today is monocrystalline silicon. The differences are in how the cells are built:
| Type | Typical efficiency | Notes |
|---|---|---|
| Mono PERC | about 21.3% to 21.7% | The older mainstream type, now being overtaken |
| N-type TOPCon | about 23.5% | Overtook PERC as the most sold type in 2024 |
| Heterojunction (HJT) | about 22.6% to 23.5% | Loses less output in heat; some carry long output warranties |
| Back-contact (for example ABC, HPBC) | about 24.1% to 24.3% | Highest efficiency; no visible wires on the front |
Industry averages from the ITRPV 2026 roadmap, as reported by PV Tech, and manufacturer datasheets.
What to compare
- Power (W). How much one panel produces in test conditions. Higher-power panels mean fewer panels for the same system size.
- Efficiency (%). How much power per square metre. It only really matters if your roof space is limited.
- Product warranty. Covers defects. In 2026 it ranges from 12 to 25 years, the biggest difference between panels.
- Performance warranty. The output guaranteed after 25 or 30 years, usually 87% to 92%.
- Degradation. How much output is lost each year, typically 0.25% to 0.4% after the first year.
- Temperature coefficient. How much output drops as the panel heats up. Less important in the UK than in hot countries.
- The manufacturer. A warranty depends on the company being around to honour it. Check UK support and track record.
- MCS listing. Panels need to be MCS certified for your system to qualify for export payments.
Real panels compared
These are examples from current manufacturer datasheets, to show how panels differ. They aren't a ranking.
| Panel | Type | Power | Efficiency | Product warranty | Output warranty |
|---|---|---|---|---|---|
| AIKO Neostar 2P54 | Back-contact | 450 to 485 W | up to 24.3% | 15 years, extendable to 25 | 30 years |
| Trina Vertex S+ | N-type TOPCon | 450 to 475 W | up to 23.8% | 25 years | 30 years, 87.4% at the end |
| LONGi LR7-54HTH | N-type | 455 to 465 W | 22.8% | 15 years | 25 years, 89.4% at the end |
| REC Alpha Pure-RX | Heterojunction | 450 to 470 W | 22.6% | 20 years (25 with REC's ProTrust) | 25 years, 92% at the end |
| LONGi Hi-MO 5m | Mono PERC (older) | 415 W | 21.3% | 12 years | 25 years |
Notice how much the product warranty varies, from 12 to 25 years, while efficiency only differs by a few percentage points.
What matters most on a UK roof
- Small roof? Pay for efficiency. A back-contact or TOPCon panel gets more onto a terrace or a hipped roof.
- Big roof? Efficiency matters less. A well-warranted panel at a sensible price is usually the better buy.
- Shade? The panel matters less than the electronics: optimisers or microinverters limit the effect of a shaded panel on the rest.
- Looks? All-black panels and back-contact panels have no visible silver lines, which some people prefer on the front of the house.
- Bifacial panels collect light on both sides. They help most on ground mounts and raised frames, where light reflects onto the back, and add little flat against a roof.
How to choose
Ask each installer which panel they're quoting, for the datasheet, and why. A good answer explains how the panel suits your roof. Compare the product warranty and who backs it as carefully as the price.
We name the exact panel, inverter and any battery in your quote, with their datasheets and warranties, so you can compare like for like with other quotes.
Questions people ask
What are the most efficient solar panels?
Back-contact panels lead in 2026, at around 24% for the best home modules, followed by N-type TOPCon and heterojunction at around 23.5%.
Are more efficient panels worth paying for?
If your roof is small, yes, because you fit more power in the same space. On a large roof, a slightly less efficient panel with a strong warranty can be better value.
What type of solar panel is best for the UK?
Monocrystalline panels, which is nearly all panels sold now. Among them, N-type TOPCon, heterojunction and back-contact panels all perform well in UK conditions.
How long are solar panel warranties?
Product warranties range from 12 to 25 years, and performance warranties usually 25 or 30 years, guaranteeing 87% to 92% of original output. The panels we fit come with a 25-year product warranty and a 30-year performance warranty.
Which brand of solar panel is best?
There isn't one answer. Compare the warranty, the manufacturer's track record and UK support, and how the panel suits your roof.
Read next
Sources
Figures and rules on this page were checked on 11 October 2026. Schemes, tariffs and prices change, so check the latest before you decide.
- PV Tech: ITRPV 2026 roadmap, 25 June 2026
- AIKO: Neostar 2P54 datasheet, checked 11 October 2026
- Trina Solar: Vertex S+ NEG9R.28 datasheet, 2026
- LONGi: LR7-54HTH datasheet, May 2024
- REC: Alpha Pure-RX datasheet, August 2024
- Energy Saving Trust: Solar panels, costs, savings and benefits, updated 1 October 2026
- GOV.UK: Smart Export Guarantee, updated 1 October 2026
Ask which panels we'd recommend for your roof
Your quote names the exact panel and inverter we're proposing, with the datasheets, and explains why they suit your roof.
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