(Corrects headline and paragraph 1 to say unit filed for bankruptcy, not entire company)
-Sunnova Energy said on Thursday it had filed for Chapter 11 bankruptcy protection for one of its units in the United States, as the residential solar panel installer grapples with a massive debt pile and sluggish demand.
(Reporting by Tanay Dhumal in Bengaluru; Editing by Shinjini Ganguli and Pooja Desai)
