This sort of question seeks to paint an overall picture of who you are as a person, specifically, your work related attitudes, principals and standards to which you adhere. Articulate your career goals as clearly as possible, revealing how they match the solar energy installation manager position being pursued. Help the interviewer to understand how this position meets your career needs in the short as well as the long term. Be yourself and discuss your motivations and why you chose a particular career course or direction and whether you see yourself continuing. Your response should provide a broadly brushed discussion of your core work related beliefs and values in practice and also give the interviewer concrete examples of them in action.