The two volume-tier alternatives to LONGi and Jinko. Both BloombergNEF tier-1, both N-type TOPCon, both about 5% cheaper than the headline brands.
JA Solar and Trina sit in the £85–£105 per panel wholesale band — about 5% below LONGi and Jinko at equivalent wattage. Both N-type TOPCon, both 25-year performance warranties, both regularly fitted by UK installers. JA Solar has the longer UK distribution history; Trina edges efficiency and is the more common choice for in-roof installs.