The best solar panels for a UK home in 2026, compared

People spend weeks choosing the best solar panels for a UK home in 2026 and five minutes choosing the installer. It should be the other way round. The gap between two good panels over twenty years is small. The gap between a good install and a bad one is a leaking roof.

The panel is still what you are buying, though, so here is what actually separates them, and what we fit on the solar panels we put on our customers' roofs.

Monocrystalline vs polycrystalline solar panels: is there still a choice?

Not really, and anyone still pushing polycrystalline at a UK house in 2026 is shifting old stock.

Monocrystalline cells are cut from a single silicon crystal. They are uniformly dark, they produce more watts per square metre, and they hold up better in weak light, which matters a lot more in the UK than it does in Spain. Polycrystalline cells are made from cast silicon, look blue and flecked, and give away efficiency you cannot afford on a small British roof.

On a semi with room for ten panels, the difference between the two shows up as several hundred kilowatt hours a year you simply never get. Thin-film is a different argument again: fine on a warehouse roof, wrong on a house.

What does N-type actually change?

N-type is about how the silicon is doped. In practice it buys you three things.

It degrades more slowly, so the panel is producing more in year 20 than an equivalent P-type would be. It performs better when hot, which sounds irrelevant here until you remember a dark roof in July gets far hotter than the air. And it is less affected by the light-induced degradation that took a slice off older panels in their first year.

None of that is dramatic on any single day. Across twenty-five years it is the difference between a panel that has quietly faded and one that has not.

What is a back-contact panel, and does it matter?

On a conventional panel the electrical contacts run across the front as thin silver lines. On a back-contact panel they are all on the rear, so the front is unbroken black silicon.

Two real benefits. More of the cell is catching light, so you get more watts from the same footprint, which matters when the roof runs out before the budget does. And there is nothing on the front to corrode, which is one fewer long-term failure route.

Modern back-contact panels sit in the low to mid twenties for efficiency. That is why a panel the same physical size as a 380 W unit from a few years ago is now rated at 480 W or more.

LONGi vs Aiko: which would I put on my own roof?

Both are good. Both are back-contact. Either one will still be working long after the inverter has been changed.

We standardised on the LONGi Hi-MO X10, and the reasons are not exciting. Supply is dependable, which means I can tell you an install date and hit it. The mechanical spec suits UK fixings and UK wind loads without a special rail. And LONGi has been around long enough that a warranty claim in year twelve has somebody to go to, which is the part of the decision nobody thinks about at the quoting stage.

Aiko's panels are strong performers and I have no complaint about the product. If a customer specifically wants them, we will price them. What I would not do is pay a premium for a brand with a short trading history and a warranty that depends on that company still existing.

That is the honest answer on LONGi vs Aiko: at this level you are choosing a supplier you trust to still be there, not chasing a couple of percent.

All-black or silver frames?

All-black panels have a black frame and a black backsheet. Silver-framed panels with a white backsheet run slightly cooler and can be marginally cheaper.

On a dark tiled roof in a Yorkshire village, all-black disappears and silver frames draw the eye to every panel edge. I have never had a customer regret paying the difference for all-black. I have had several ask me to change silver ones afterwards, which is not a cheap job once the scaffold has gone.

If nobody can see the roof from the ground, spend the money elsewhere. Which way it faces decides the yield; whether it is overlooked decides whether the looks are worth paying for.

In-roof or on-roof?

On-roof is the normal way: hooks under the tiles, rails, panels sitting a few centimetres above the tile line.

In-roof sets the panels flush, replacing the tiles underneath with a tray system. It looks considerably better, it is often what a planning officer wants to see in a conservation area, and it is what most new builds get.

It also costs more, it runs hotter because there is less air behind the panels, and it is a genuine roofing job rather than a mounting job. I would fit in-roof on a front elevation or a new build. On an ordinary rear pitch it is money spent on something only the pigeons see.

Which are the best solar panels for a UK home in 2026, in practice?

Here is the job we fit most weeks. A three-bed semi in Rotherham, a south-west rear pitch, ten LONGi Hi-MO X10 panels for 4.8 kWp, a Hanchu 5 kW hybrid inverter, all-black, on-roof, no optimisers because the survey found nothing shading it.

That array makes between 4,500 and 4,800 kWh a year on the 950 to 1,000 kWh per kWp we see across South Yorkshire. With a 5.12 kWh battery it starts from £9,000 fitted, and it is zero-rated for VAT until 31 March 2027 (HMRC, VAT Notice 708/6).

Swapping the panel brand on that job changes the annual figure by a rounding error. Swapping ten panels for eight because someone measured badly changes it by a fifth.

How do I read a datasheet without getting lost?

Four numbers are worth your time.

Rated power in watts. What one panel does at test conditions. Multiply by the number of panels for the array size.

Efficiency. Watts per square metre, effectively. It only matters when the roof is the limit, which on a British house it usually is.

Temperature coefficient. How much output is lost per degree above test temperature. A smaller number is better and it is the figure that quietly separates panels in July.

The two warranties. The product warranty covers the panel itself. The performance warranty is a promise about what percentage it still produces at year 25. They are different lengths, and installers quoting "25 year warranty" are usually quoting the second one.

The verdict

Pick any current N-type back-contact panel from a manufacturer that will still exist in fifteen years, go all-black if the roof is visible, and put the energy you saved into checking the installer instead. Ask for their MCS number, ask who does the roof work, and ask to see a job they finished last month.

Which one ends up on your roof

How solar panels work covers what the rest of the system does, and solar panel cost in Yorkshire has the price ladder.

When you want the layout for your own roof, Get a quote with your postcode, or ring 01709 278248 and ask what we would put on it.