Tesla has relaunched its troubled solar power efforts, and that now includes an option that might be more affordable for some homeowners. The company has debuted a Rent Solar program that lets residents in six states (Arizona, California, Connecticut, Massachusetts, New Jersey and New Mexico) pay a monthly fee instead of making an expensive up-front purchase. You'll typically pay $50 per month ($65 in California), but Tesla will do all the hard work. There's no long-term contract -- Tesla is simply betting that you'll keep it for long enough for those fees to add up....