Tesla Motors — a Silicon Valley startup backed by entrepreneur Elon Musk, the South Africa-born cofounder of PayPal — is making plans to roll out its second electric car. The company has released the details of its Tesla Model S. The Model S is promising a 300-mile range — this is not just an about-town commuting car — and the ability to recharge the battery within 45 minutes. The Model S is also much larger than Tesla’s earlier Roadster, making it possible for a family to consider it.