Choosing between Aiko Solar Panels, JA Solar and LONGi for a UK rooftop in 2026 isn't about picking a winner — it's about matching the right cell technology, footprint and price point to your roof. All three manufacturers sit comfortably in BloombergNEF's Tier 1 list, all three produce MCS-certified modules eligible for the Smart Export Guarantee (SEG), and all three have residential panels on the shelf at Quality Heating for less than £150 each.
This guide focuses on the cheaper end of each brand's range — the panels that actually get fitted on most UK homes — and then showcases Aiko's flagship Stellar 3N+ 665W for larger roofs, commercial projects and anyone chasing maximum generation per square metre.
Why N-Type Back-Contact Panels Dominate 2026
A decade ago, the UK residential market was dominated by P-Type PERC panels running at 19–21% efficiency. That's gone. Every brand in this comparison has moved to N-Type cell chemistry, which resists Light-Induced Degradation (LID) and Potential-Induced Degradation (PID), and the premium modules from Aiko and LONGi use back-contact architectures that eliminate front-side busbars entirely.
The practical upshot for a UK homeowner is threefold:
The Three Brands At A Glance
Each manufacturer has a distinct identity in the UK market — here's how to think about them before diving into specific panels:
ABC (All Back Contact) technology pushes modules to 24.4% module efficiency — the highest widely available in UK residential. Premium finish, premium price per panel, but fewer panels needed. Founded 2009, see the Aiko range.
The world's largest solar manufacturer by volume. HPBC 2.0 back-contact on the Hi-MO X10 puts them neck-and-neck with Aiko at 23.8%. Deep supply chain, strong brand recognition. Explore LONGi panels.
TOPCon N-Type bifacial modules with mature traceable supply chain. Uses a conventional busbar layout — efficiency is a few points lower, but so is the price per watt. Used by ~41% of UK installers. Browse JA Solar panels.
ABC vs HPBC vs TOPCon: The Cell Tech Explained
All three brands are now N-Type, but how they structure the cell determines efficiency, shade response, and how the panel looks on your roof. Understanding this in 30 seconds will save you picking the wrong panel.
All Back Contact. Every electrical connection is moved to the rear face. Front of the cell is 100% light-absorbing surface — no busbars, no shadowing. Delivers 24.4% module efficiency and a completely uniform black appearance. Divides the panel into independently functioning zones for superior partial-shade performance.
Hybrid Passivated Back Contact. LONGi's answer to ABC. Contacts moved to the rear give a clean all-black look and reach 23.8% on the Hi-MO X10. Performs similarly to ABC on partial shading thanks to back-contact architecture. Lower-cost HPBC variants are available on the Hi-MO X6 Max range from just £99.
Tunnel Oxide Passivated Contact. Retains front-side busbars but uses an N-Type wafer with an ultra-thin tunnel oxide layer. Typically 22–23% module efficiency. Proven, mature, cheaper to manufacture — and almost always the cheapest N-Type option per watt. Best suited to roofs with ample space and minimal shading.
Bifacial (dual-glass) panels capture reflected light from the rear surface, adding 5–10% extra yield on light-coloured roofs or raised mounts. All three brands offer both, but JA Solar's bifacial modules are especially competitively priced. For typical dark tile or slate roofs, the monofacial difference is minimal.
Head-to-Head Spec Table
All prices include VAT at Quality Heating. The cheapest panel in each brand's N-Type residential range is marked for quick reference.
| Panel | Power | Efficiency | Cell Tech | Warranty | Price |
|---|---|---|---|---|---|
| LONGi Hi-MO X6 Max Explorer (460W) | 460W | 22.7% | HPBC Half-Cell | 25yr Performance | £99.00 |
| JA Solar 455W N-Type Bifacial (Black Frame) | 455W | ~22.0% | N-Type TOPCon Bifacial | 25yr Performance | £105.00 |
| JA Solar 460W N-Type LB Traceable MC4-EVO2 | 460W | ~22.2% | N-Type TOPCon Bifacial | 25yr Performance | £107.00 |
| Aiko 450W Neostar 2S (All Black) | 450W | 23.0% | N-Type ABC Gen 2 | 25yr Perf / 30yr Linear | £113.00 |
| Aiko 465W Neostar 2S (All Black) | 465W | 23.8% | N-Type ABC Gen 2 | 25yr Perf / 30yr Linear | £113.40 |
| LONGi Hi-MO X10 485W (Black Frame) | 485W | 23.8% | HPBC 2.0 | 25yr Perf / 30yr Linear | £130.00 |
| Aiko 540W Neostar 3P+ (Dual-Glass) | 540W | 24.4% | N-Type ABC Gen 3 Bifacial | 25yr Product / 30yr Linear | £147.00 |
| Aiko Stellar 3N+ 665W (72-Cell) | 665W | ~23.0% | N-Type ABC 72-Cell Dual-Glass | 25yr Product / 30yr Linear | £165.00 |
The Budget Picks From Each Brand
These are the panels we recommend when budget is the primary driver but you still want proper N-Type performance and long warranties. All five sit under £150 including VAT.
LONGi Solar
460W Hi-MO X6 Max Explorer HPBC SDM1
The cheapest N-Type back-contact panel in the Quality Heating range. HPBC cell structure on a black-frame chassis — exceptional value for medium-to-large roofs where you can fit more modules rather than chasing maximum per-panel output.
£99.00 inc. VAT
JA Solar
455W N-Type Double Glass Bifacial Black Frame
JA Solar's most affordable residential N-Type module. Double-glass bifacial construction with traceable low-carbon supply chain and MC4 connectors. A dependable workhorse for straightforward unshaded roofs.
£105.00 inc. VAT
Aiko Solar
450W Neostar 2S N-Type ABC All Black Gen 2
The cheapest entry point into Aiko's ABC All-Back-Contact technology. Uniform all-black finish with zero front-side busbars — aesthetically the cleanest panel at this price, and MCS-certified for UK grid-tie installations.
£113.00 inc. VAT
Aiko Solar
465W Neostar 2S N-Type ABC Gen 2 All Black
Just 40p more than the 450W but delivers an extra 15W and 23.8% module efficiency — the sweet spot of the Aiko Gen 2 line for UK residential. Same physical footprint, same ABC architecture, better per-panel output.
£113.40 inc. VAT
Aiko Solar
540W Neostar 3P+ Dual-Glass ABC Gen 3
Third-generation bifacial ABC module at 24.4% module efficiency — class-leading in UK residential. Dual-glass 2+2mm construction, −0.26%/°C temperature coefficient, BNPI bifacial output of 570W, and a 30-year linear performance warranty.
£147.00 inc. VAT
LONGi Solar
Hi-MO X10 485W HPBC 2.0 Black Frame
LONGi's flagship back-contact residential module. HPBC 2.0 cells hit 23.8% efficiency in a compact footprint — ideal when you want top-tier performance with the reassurance of the world's largest PV manufacturer behind the product.
£130.00 inc. VAT
How Many Panels Do You Actually Need?
A typical UK domestic solar installation produces roughly 850–950 kWh per year per kWp installed, depending on location, roof pitch and orientation. South-facing Kent roofs lean towards the upper end; east/west splits in Scotland towards the lower. Use this rule of thumb to work backwards from annual consumption:
Flat / Small Home
~2,000 kWh/year
A 2.5 kWp array at 460–490W per panel. Covers daytime appliance use, fridge-freezer and light electronics. Ideal for a one or two-bed flat with south-facing roof. Aiko 465W Neostar 2S or JA 460W are both strong fits.
Average 3-Bed Semi
~3,500 kWh/year
A 4 kWp system — the UK's most common residential size. Runs washing machine, dishwasher, tumble dryer daytime loads and charges a battery. LONGi Hi-MO X10 485W lets you hit 4 kWp with just 9 panels.
4-Bed Detached + EV
~6,000 kWh/year
A 6–7 kWp array to cover family use plus EV charging. Aiko 540W Neostar 3P+ hits 7 kWp with 13 panels — maximising output on a standard double-pitched roof without needing jumbo modules.
Heat Pump + EV + Battery
~9,000–12,000 kWh/year
For homes running an air source heat pump, EV and battery storage. Target 10–12 kWp. The 665W Aiko Stellar 3N+ reaches 10.6 kWp with 16 panels — best option when mounting brackets and labour matter.
A quick sizing exercise: if your electricity bill shows 4,200 kWh/year, divide by 900 kWh/kWp = 4.7 kWp. At 460W per panel that's 10–11 modules. At 540W it's 9, at 665W it's 7. Bigger panels cost more each but reduce mounting hardware, labour and installation time — often levelling out the total system cost.
Which Brand For Your Specific Roof?
After years of specifying systems across the British Isles, we've settled on a handful of reliable rules:
Tight Roof, Max Output
Choose Aiko
If you can only fit 6–10 panels, every watt per square metre matters. The Aiko 540W Neostar 3P+ or 465W Neostar 2S will produce more kWh from the same footprint than any TOPCon alternative at comparable wattage.
Large South-Facing Roof
Choose JA Solar
If you've got 20 m² or more of unshaded roof, JA's 455W bifacial at £105 lets you build a bigger array for less. The efficiency gap matters less when you have headroom to add panels.
Complex / Partially Shaded Roof
Choose Aiko or LONGi
Both use back-contact cell architectures that handle partial shading from chimneys, aerials or overhanging trees far better than conventional panels. Pair with an inverter that has per-panel MPPT or optimisers for best results.
Commercial / Barn Roof
Choose Aiko Stellar 3N+
For 20+ kWp arrays, 72-cell 665W modules cut the BoS (Balance of System) costs dramatically. Fewer mid-clamps, fewer connector crimps, fewer string calculations. Faster install, cleaner run.
Shipping Across the UK & British Isles
Solar panels are heavy, oversized goods that ship by pallet — but we make delivery simple across the British Isles. Standard UK mainland delivery on solar panels is £170 per order, regardless of how many panels you buy. Orders over £2,500 ship completely free.
Free Shipping on Solar Orders Over £2,500
Most 4 kWp+ systems cross this threshold with a single inverter and a set of panels. Pair your panels with a hybrid inverter or a storage battery to unlock free delivery automatically at checkout.
We deliver across the UK mainland, plus dedicated services to:
Ready to Size Your Solar System?
Our team can put together a fully MCS-compatible quote combining panels, inverter, battery and mounting kit. Add £2,500+ to your basket and shipping is on us.