Aiko vs Phono vs Hyundai vs Ulica: Choosing the Right Solar Panel

Specifying the right module is one of the more consequential calls on any solar job. Efficiency, degradation, temperature behaviour, warranty and how a panel copes with shade all feed into the yield a customer sees over 25 years  and into how many callbacks land back on you. This guide compares four panels of Triple Solar stocks: the Aiko 445W N-Type ABC, the Phono Solar Twin+ 410W, the Hyundai HiE-S410DG full black and the Ulica UL-400M-108HV. Each earns its place on a different kind of project.

Key takeaways

• Aiko’s 445W N-Type ABC leads on efficiency (up to 23.6%) and shade optimisation  the premium pick.

• Hyundai’s G12 shingled full-black panels excel at shade tolerance and durability in a compact footprint.

• Phono’s Twin+ 410W balances solid performance and value across residential and commercial work.

• Ulica’s Tier 1 UL-400M offers dependable, cost-effective output where headline efficiency is less critical.

How to compare solar panels

Before the individual panels, it helps to be clear on the criteria that actually move the needle on a UK install:

• Module efficiency - more watts per square metre, which matters most on limited roof space.

• Degradation and performance warranty - how much output the panel still delivers after 25 to 30 years.

• Temperature coefficient - how little the panel loses as it heats up; closer to zero is better.

• Shade tolerance - driven by cell architecture, whether shingled, all-back-contact or half-cut.

• Durability - mechanical load ratings, corrosion resistance, and micro-crack resistance.

• Aesthetics and product warranty - full-black finishes and the length of cover backing the hardware.

At a glance: the four panels compared

*Phono and Ulica warranty terms vary by SKU and date — confirm against the current datasheet before quoting.

Aiko 445W N-Type ABC - the efficiency leader

The Aiko sits at the premium end for good reason. Its N-Type ABC (all-back-contact) cells move every electrical contact to the rear of the cell, freeing up the front face to capture more light  which is how it reaches up to 23.6% module efficiency, among the highest on the market.

• Up to 23.6% module efficiency more generation from the same roof area.

• Cell-level partial-shade optimisation, limiting losses from chimneys, trees or dirt.

• Strong temperature coefficient of around -0.26%/°C, holding output better in warm weather.

• Micro-crack resistant, with a high-temperature safety restriction; 1500V DC max system voltage.

• Full-black, bezel-less aesthetic; roughly 1722 × 1134 × 30 mm.

• 15-year product and 30-year performance warranty.

• Recognised by the 2023 Intersolar Innovation Award, the 2023 Red Dot Design Award and for 2024 ESG transparency.

Best for: premium residential and space-constrained roofs where maximum yield per square metre and a clean look matter most.

Phono Solar Twin+ 410W — the balanced all-rounder

Phono Solar is a Tier 1 manufacturer, and the Twin+ 410W all-black is a sensible workhorse. It pairs mono-PERC half-cut cells with a multi-busbar layout, which lowers resistive losses in the cell connections and improves behaviour when part of the array is shaded.

• 410W output at around 21% efficiency.

• Twin+ multi-busbar and half-cut cells for reduced power loss and better partial-shade performance.

• PID resistant, with UL and IEC certification.

• Competitive high-temperature performance and robust snow (5400 Pa) and wind (2400 Pa) load ratings.

• Positive power tolerance of 0/+5W.

Best for: installers who want dependable, well-priced performance across a mix of residential and commercial jobs.

Hyundai HiE-S410DG Full Black shingled and shade-tolerant

Hyundai’s DG full-black series uses G12 PERC shingled cells rather than conventional busbar-linked cells. (The shingled format overlaps cell strips and bonds them with conductive adhesive, which improves shade tolerance and reduces the micro-cracks that plague soldered panels.) The result is a compact, durable, genuinely full-black module.

• 410W at around 20.6% efficiency; a 415W variant (HiE-S415DG) is also available at up to ~20.9%.

• G12 PERC shingled cells are busbar-free, with strong shade tolerance and low-light performance.

• LID and PID eliminated for higher real-world yield over the panel’s life.

• Passed salt-mist and ammonia corrosion testing; tempered glass and a reinforced frame.

• Compact 1812 × 1096 × 30 mm footprint at roughly 20.8 kg  useful on smaller roofs.

• 25-year product and 25-year performance warranty.

Best for: shaded, compact or coastal roofs where shade tolerance, corrosion resistance and a shorter panel are advantages.

Ulica UL-400M-108HV — dependable Tier 1 value

Ulica may be less of a household name, but it is a Tier 1 (BNEF) manufacturer, and the UL-400M-108HV is a solid, cost-effective choice. It uses 108 mono-PERC half-cut cells and is built to hold up in demanding conditions.

• 400W output at around 20.5% efficiency.

• 108 mono-PERC half-cut cells with a positive power tolerance of 0/+5W.

• Tier 1 certified, corrosion resistant, with strong snow and wind load resistance.

• UL and IEC certified for quality and safety.

• A higher-output UL-455M variant adds an anodised black frame, PID resistance and a 25-year performance / 12-year materials warranty.

Best for: value-driven residential and commercial installs where long-term reliability matters more than chasing the highest efficiency figure.

Which panel should you choose?

There is no single winner the right module depends on the roof and the customer’s priorities:

• Limited roof space or maximum yield and premium looks → Aiko 445W N-Type ABC.

• Significant shading → Hyundai’s G12 shingled panels or the Phono Twin+, both of which handle partial shade well; Aiko’s ABC cells also excel here.

• Coastal or harsh environments → Hyundai (salt-mist and ammonia tested) or Ulica (corrosion resistant).

• Value at scale → Ulica UL-400M or the Phono Twin+.

• Larger commercial arrays → step up to higher-wattage variants such as Aiko’s 460W+, Ulica’s 455M or Hyundai’s commercial series.

Sourcing through Triple Solar

All four panels are available from Triple Solar, a UK trade solar distributor. It pays to match the module to compatible inverters and batteries for the best system performance, so speak to the team for current trade pricing, stock and specification advice before you order.