CORRECTED-Sunnova Energy's unit files for Chapter 11 bankruptcy protection

(Corrects headline and paragraph 1 to say unit filed forbankruptcy, not entire company)

June 5 - Sunnova Energy said on Thursday it hadfiled for Chapter 11 bankruptcy protection for one of its unitsin the United States, as the residential solar panel installergrapples with a massive debt pile and sluggish demand.(Reporting by Tanay Dhumal in Bengaluru; Editing by ShinjiniGanguli and Pooja Desai)