Types of Solar Panels: Which Is Best for You?
Monocrystalline, polycrystalline, thin-film, bifacial — explained simply. Plus the honest 2026 truth most guides miss: the real choice isn’t mono vs poly any more, it’s which N-type monocrystalline suits your roof.
The short answer
There are three main types of solar panel — monocrystalline, polycrystalline and thin-film — but for a UK home in 2026 the honest answer is simpler than most guides make it. Monocrystalline (single-crystal silicon, uniform black, 20–24.6% efficient) dominates at ~95% of the market and is what almost every home now fits. Polycrystalline (blue, speckled, cheaper) is essentially obsolete — under 1% of residential installs. Thin-film (flexible, low-efficiency) is niche. And bifacial (dual-sided) is a commercial/ground-mount speciality, not for house roofs.
So the old “mono vs poly” question is out of date. The real 2026 choice is which monocrystalline panel — specifically which cell architecture: N-type TOPCon (the mainstream default, best all-rounder), HJT (premium), or Aiko ABC (the efficiency king, best for limited roofs). For most homes, N-type monocrystalline TOPCon is the right pick. Full breakdown of every type, the N-type story, and which suits your home — below.
What this guide covers
“What type of solar panel should I get?” used to have a simple textbook answer split between mono and poly. In 2026 that’s changed — so this guide explains every type honestly, then cuts to the practical question that actually matters for your home: which monocrystalline panel.
The types of solar panels at a glance
| Type | Efficiency | Look | Best for |
|---|---|---|---|
| Monocrystalline | 20–24.6% | Uniform black | Almost all homes |
| Polycrystalline | 13–16% | Blue, speckled | Obsolete — avoid |
| Thin-film | 10–13% | Flexible sheet | Curved / portable / niche |
| Bifacial | Varies | Glass-glass | Ground-mount / commercial |
All modern quality home panels are monocrystalline — the other types are either obsolete (poly) or niche (thin-film, bifacial). So while there are technically several “types,” the real-world choice for a UK home is which monocrystalline panel, which comes down to cell architecture (below). Let’s go through each type honestly.
Monocrystalline — the default choice
Monocrystalline panels are made from a single, pure silicon crystal, which gives them the highest efficiency (20–24.6% on 2026 modules) and a sleek, uniform black appearance that suits most roofs. They generate the most power per square metre — so you need fewer panels — perform well in the UK’s low light, and last 25–30 years with strong warranties. They make up around 95% of the market and are what virtually every UK home now fits. The only “downside” is a marginally higher price than the (now-obsolete) alternatives — but with prices having fallen so far, that gap is small and easily justified by the better output, looks and longevity. Leading brands include Jinko (Tiger Neo), JA Solar (DeepBlue), Trina (Vertex), Canadian Solar and Aiko — see our best solar panels guide for the brand comparison. Within monocrystalline, though, there’s an important sub-choice — the cell architecture.
Polycrystalline — now obsolete
Polycrystalline panels are made from multiple silicon fragments melted together, giving them a distinctive blue, speckled appearance and lower efficiency (13–16%). For years they were the budget choice — cheaper to make than monocrystalline. But here’s the honest 2026 position: polycrystalline is essentially obsolete for home solar, making up under 1% of UK residential installs. Monocrystalline prices have dropped so far that poly’s small cost saving no longer offsets its worse efficiency and mottled looks — so quality installers have moved to mono as standard. If a 2026 quote specifies polycrystalline, treat it as a red flag: it may signal old stock or a corner-cutting installer. The mono-vs-poly debate is effectively over, and mono won.
Thin-film
Thin-film panels are made by depositing photovoltaic material in thin layers onto a substrate (glass, metal or plastic). They’re flexible, lightweight and cheaper per panel, but much less efficient (10–13%), so they need far more space for the same output — impractical for most home roofs. Where they earn their place is niche: curved or irregular surfaces, portable/campervan use, and some very large commercial or utility installations where space isn’t limited. Thin-film comes in a few varieties (CdTe, CIGS, amorphous silicon), but for a typical UK home, it’s not the right choice — a compact, high-efficiency monocrystalline panel does far more with your roof space.
The N-type story — the real 2026 choice
Forget mono vs poly — the modern question is which N-type monocrystalline
This is what most “types of solar panels” guides miss. Since almost every home fits monocrystalline, the choice that actually matters is the cell architecture within it — and the big shift is from older P-type to newer N-type silicon. Here’s the practical run-down:
PERC (older P-type): the previous standard, 19–21% efficient, now the budget end. Fine but being superseded.
N-type TOPCon (the 2026 mainstream default): 22–24% efficient, excellent low-light performance (ideal for cloudy Britain), lower degradation, only marginally dearer than PERC — what most UK homes should and do now fit.
HJT (heterojunction, premium): 23–25%, top-tier performance and temperature tolerance, at a premium.
Aiko ABC / IBC (the efficiency king): 23.5–24.5%, all-back-contact cells (no front gridlines) — the highest efficiency and best for limited roof space. See our Aiko review.
The key takeaway: you want N-type (TOPCon for most, Aiko ABC if roof space is tight). N-type generates more, holds its output better over 25–30 years, and suits UK light — the small premium over old P-type PERC is well worth it. When comparing quotes, check whether the panels are N-type (modern) or older P-type.
Bifacial — great for commercial, not homes
Bifacial panels generate from both sides, capturing light that reflects onto the rear. That sounds great — but the rear side only works with a reflective surface behind the panel. On a standard pitched house roof, panels sit against a dark, non-reflective roof, so the back captures almost nothing: you pay a premium for little benefit. Where bifacial genuinely delivers is ground-mounted arrays (over light gravel or grass) and flat commercial roofs with white membranes, where the rear can add 5–15%. So for a home roof, standard high-efficiency monocrystalline is better value — if an installer pushes bifacial for a normal house roof, ask how much rear-side generation they realistically expect (honest answer: very little). Our bifacial panels guide covers this in full.
Which type of solar panel suits your home?
| Your situation | Best panel type |
|---|---|
| Most UK homes | N-type monocrystalline TOPCon |
| Limited / small roof | Aiko ABC (highest efficiency) |
| Looks matter most | All-black monocrystalline |
| Ground-mount / big flat commercial roof | Bifacial |
| Curved surface / portable | Thin-film / flexible |
| Tight budget | PERC monocrystalline (not poly) |
For the great majority of homes, the answer is N-type monocrystalline TOPCon — the best all-round balance of efficiency, low-light performance, looks and value. Tight roof space pushes you toward Aiko ABC (most watts per square metre); a design-led choice means all-black mono; and only ground-mount or big commercial roofs justify bifacial. What you almost never want in 2026 is polycrystalline. But the honest truth is that the ideal panel depends on the specifics of your roof — its size, orientation, shading and your budget — which is why the best way to land on the right type isn’t a table, it’s a proper look at your home. (For choosing between specific brands once you know the type, see our best solar panels guide, and for the cost, our cost guide.)
Frequently asked questions
What are the main types of solar panels?
Three: monocrystalline (single-crystal, 20–24.6% efficient, black, ~95% of market, the default), polycrystalline (multi-crystal, blue, 13–16%, now obsolete), and thin-film (flexible, low-efficiency, niche). Plus bifacial (dual-sided, for ground-mount/commercial). In 2026 it’s really about which monocrystalline you pick.
What’s the best type for a UK home in 2026?
N-type monocrystalline TOPCon for almost every home — 22–24% efficient, great low-light performance, lasts well, only marginally dearer than older tech. Limited roof? Aiko ABC (24.5%). Looks? All-black mono. Avoid polycrystalline (obsolete) and don’t pay for bifacial on a house roof.
What’s the difference between N-type and P-type?
The silicon type. P-type (older, includes PERC) is cheaper but ~19–21% efficient and degrades faster. N-type (TOPCon, HJT, Aiko ABC) is the 2026 standard — 22–24.6%, better low-light and temperature performance, lower degradation. You want N-type; the small premium over P-type PERC is worth it. Check which your quote offers.
Are bifacial panels worth it for a house?
Usually not. Bifacial captures rear-side light, but that needs a reflective surface behind the panel — a dark house roof reflects almost nothing, so you pay a premium for little benefit. Bifacial suits ground-mount and flat commercial roofs (white membrane), not homes. See our bifacial guide.
Is polycrystalline still worth it?
No — polycrystalline is essentially obsolete for UK homes (under 1% of installs). Monocrystalline now costs only marginally more but generates more and looks far better. A 2026 quote specifying poly is a red flag (old stock or a budget installer). Fit monocrystalline N-type instead.
What about solar tiles and thin-film?
Solar tiles (BIPV) replace roof tiles for a discreet look — a premium, niche whole-roof product (see integrated solar). Thin-film is flexible and cheap but low-efficiency, suited to curved/portable use, not main home roofs. For a standard roof, monocrystalline panels do far more with the space.
The bottom line
There are several types of solar panel, but for a UK home in 2026 the honest answer cuts through the jargon: fit monocrystalline. Polycrystalline is obsolete, thin-film and bifacial are niche, and the real decision is which monocrystalline — with N-type TOPCon the right all-round choice for most homes, Aiko ABC when roof space is tight, and all-black when looks lead. The one modern rule worth remembering: choose N-type, not older P-type — it generates more, lasts better and handles British light. Anyone still framing the choice as “mono vs poly” is working from out-of-date information.
That said, the ideal panel for your home depends on your roof’s size, orientation, shading and your budget — which is exactly what a proper survey assesses. The best next step is to find out which panel suits your house: a couple of free, no-obligation quotes from MCS-certified installers will recommend the right panel type and brand for your specific roof, and give you real prices — so you get the ideal panel for your home, not a generic one.
Important
Going Solar UK is an introduction service, not an installer. This guide gives general 2026 information on solar panel types for research: panel technology, efficiency figures and availability change over time, and the best type for your home depends on your roof, budget and goals – the details here are typical estimates, not guarantees. Always get professional advice and itemised quotes from MCS-certified installers, who will recommend the right panel type and brand for your specific property, before deciding.
We may receive a commission when we introduce you to an installer, at no cost to you. Any contract for work is directly between you and the installer.