Is LONGi a good brand?

Excellent — LONGi is the world's largest solar panel manufacturer. Tier 1 bankability (trusted by banks for financing). Consistent quality verified by independent testing. Used on millions of installations worldwide.

How does LONGi compare to JA Solar?

Very similar: LONGi Hi-MO 6 (21.5%, 430W) vs JA Solar DeepBlue 4.0 (21.3%, 425W). Both are excellent value tier-1 panels. LONGi has marginally better efficiency; JA Solar has slightly better availability in some regions.

Should I pay more for SunPower or REC over LONGi?

Only if roof space is limited. On a standard roof with ample space: LONGi achieves the same total output at lower cost. The premium brands' higher efficiency only matters when every m² counts.

Are LONGi panels made in China?

Yes — LONGi is a Chinese company. Their panels are manufactured to international standards (IEC 61215, IEC 61730) and independently tested. Chinese manufacturing delivers excellent quality at competitive prices.

LONGi Solar Panels Review

By Home Solar Guide Team|Updated 18 March 2026|comparison

Independently written | Evidence-based | Sources cited

LONGi panels — LONGi Hi-MO 6: world's largest panel manufacturer. Excellent value for UK homes.

Find out how much you could save

Answer a few questions and receive personalised solar quotes — completely free.

Start My Quote

Free, no obligation. Takes 2 minutes.

Ready to see how much you could save?

Get 3 free quotes from MCS-certified installers in your area.

Get Free Quotes

Are LONGi solar panels good?

LONGi solar panels review: MODEL: Hi-MO 6. EFFICIENCY: 21.5% — excellent for the price. TECHNOLOGY: HPBC (Hybrid Passivated Back Contact) cells. Half-cut design. POWER: 415-430W per panel. WARRANTY: 25 years product + 25 years performance at 87.4%. DEGRADATION: 0.4%/yr — standard for the industry. PRICE: competitive — often the cheapest tier-1 panel. Most UK installers offer LONGi as their standard option. GLOBAL POSITION: world's largest solar panel manufacturer. Massive R&D investment, scale advantages, consistent quality. RELIABILITY: Tier 1 bankability, regularly tested by PVEL (excellent results). UK AVAILABILITY: most widely available panel in the UK — virtually every MCS installer stocks LONGi. VERDICT: the default choice for UK homeowners — excellent performance at the best price.

Frequently Asked Questions

Related: Home Heating Systems

Solar panels are most powerful when combined with an efficient heating system. Heat pumps use solar-generated electricity to heat your home at 300-400% efficiency — making them the ideal partner for solar.

how heat pumps work

A heat pump converts 1kWh of electricity into 3-4kWh of heat.

From our sister site Home Heat Pump Guide