I've been contacted by Sunrun recruiters at least 3 times. The first two times, I received no follow up after I replied. The third time I went through a phone screen, and then a phone interview with a hiring manager. The interview went well and the manager indicated that he would be following up. After a couple days I sent the recruiter an email thanking them for the opportunity to interview. No surprise though, I was once again ghosted by Sunrun.
This is a very unprofessional company and I would recommend telling them "Thanks, but no thanks." if they contact you about an opportunity. Don't waste your time.