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Two Chinese solar giants are in a tussle over technology standards that hinges on a mere 28 millimeters, with the outcome set to determine which company has an edge going forward in the $200 billion industry.

The combatants are the world’s biggest solar manufacturers, pitting industry leader Longi Green Energy Technology Co. against the world’s second-biggest player Trina Solar Co. And the battle involves bragging rights over the ideal size for wafers, the key component for making solar modules: Which is better, Longi’s 182-mm version, or Trina’s 210-mm?

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