Did a salesperson knock on your door and promise free rooftop solar panels at no cost to you? Or say you'll never have to pay another electricity bill because government programs, grants, or rebates cover your solar installation? It's likely a scam. . Scams, schemes and straight-up fraud abound in the dark underbelly of an otherwise light-filled industry. Here are red flags to look out for when. . In the worst cases, homeowners have been left making payments on overpriced systems that don't work, with little to no support from the installation company that put the panels on their roof. To avoid getting scammed, you need to know what to look out for and when to walk away. While there are some government-funded solar. .