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Longi

Hi-MO X6 440W

House Verdict
9.0/10
★★★★★

Longi's Hi-MO X6 is the panel most British solar installers quote first. The efficiency-to-price ratio is hard to argue with, the supply chain is reassuringly boring, and the panel has now accumulated enough field data in UK homes to be the genuine sensible default.

Efficiency
22.8%
Running cost
£-610/yr
Installed
£170 to £220 per panel installed
Best for
Standard south-facing roofsValue-led 4kWp systemsMost UK households
Dark blue monocrystalline solar panel array on a clean slate UK roof in calm overcast daylight.

Editorial render. Not a manufacturer photograph; we do not redistribute press imagery without a licence.

Primary question · Is the Longi Hi-MO X6 the safest default solar panel in 2026?

The five questions
Is this right for me?

Most British roofs where the priority is honest cost per kWp and the panels will not be a feature of the elevation.

What will it cost?

£170 to £220 per panel installed

Advantages
  • Best efficiency per pound in the volume tier
  • Universal UK installer familiarity
  • Stable supply across distributors
Trade-offs
  • Front sheet aesthetic is functional rather than designed
  • Warranty handling depends on the UK importer
What to do next

Open the cost planner to estimate your installed price.

Key specifications

Power output
440 W per panel
Efficiency
22.8%
Temperature coefficient
−0.29%/°C
Product warranty
15 years
Perfect for
Most British roofs where the priority is honest cost per kWp and the panels will not be a feature of the elevation.
Avoid if
The roof is small and you need every available watt; the SunPower Maxeon 6 squeezes more output from the same area.
What we like
  • , Best efficiency per pound in the volume tier
  • , Universal UK installer familiarity
  • , Stable supply across distributors
What we don't
  • , Front sheet aesthetic is functional rather than designed
  • , Warranty handling depends on the UK importer
House Verdict · Confidence: high
★★★★★
Worth considering instead
House Summary

If your brief matches "most british roofs where the priority is honest cost per kwp and the panels will not be a feature of the elevation.", the Hi-MO X6 440W is a confident pick. If it doesn't, the alternatives above are more honest answers.

Related decisions
Next Step

Estimate your installed cost

The planner uses your specific home; not a brochure number.

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