LONGi Solar Panels
China
LONGi is the world's largest monocrystalline silicon producer and a top-3 panel manufacturer. Their Hi-MO series panels use proprietary HPBC cell technology for industry-leading efficiency. Known for investing heavily in R&D and manufacturing quality control. A strong mid-to-premium option for UK roofs.
Available Models
Specs are indicative - model availability changes, so confirm current models with your MCS-certified installer.
LONGi Hi-MO 6 445W
HPBC Monocrystalline
LONGi Hi-MO 7 590W
HPBC Monocrystalline
Pros
- +World's largest mono-silicon producer (vertically integrated)
- +Industry-leading efficiency
- +15-year product warranty
- +Heavy R&D investment
- +Excellent degradation rate
Cons
- -Slightly more expensive than Jinko/Trina
- -Chinese-manufactured
- -Some installers prefer other brands for availability
Compare LONGi With
LONGi Solar Panels: FAQs
How much do LONGi solar panels cost in the UK?
LONGi solar panels cost £1,425-£1,700 per kW fully installed - around £5,700-£6,800 for a typical 4kW system, with 0% VAT included (indicative June 2026). There is no purchase grant to subtract in the UK, so the quoted price is the full story.
Are LONGi solar panels any good?
LONGi is the world's largest monocrystalline silicon producer and a top-3 panel manufacturer. Their Hi-MO series panels use proprietary HPBC cell technology for industry-leading efficiency. LONGi is best suited to homeowners wanting top-tier technology at a mid-range price point.
How efficient are LONGi solar panels and how long do they last?
The LONGi Hi-MO 6 445W runs at 22.3% efficiency (HPBC Monocrystalline) and degrades just 0.4% per year, so it still produces strongly after 25 years. LONGi backs it with a 15-year product warranty and a 25-year performance warranty.
What financial help exists for a LONGi system in the UK?
There is no solar purchase grant in the UK. What does exist: 0% VAT on residential solar installations until 31 March 2027 (then 5%), typically worth £1,000-3,000 versus the standard 20% rate, and SEG (Smart Export Guarantee) payments of roughly 1p-30p+ per kWh for exported power. With grid electricity around 25p/kWh (Ofgem cap average) against typical SEG flat rates near 12p/kWh, using your LONGi generation at home is worth roughly double exporting it.
LONGi vs other solar brands - which should I choose?
LONGi sits at the mid-range end of the UK market. It balances top-tier technology with a sensible price. See the head-to-head comparisons below for direct spec-by-spec matchups, and have an MCS-certified installer confirm what suits your roof.