Grid tied systems are extremely low cost and high performance. The inverters do all the work. Panel prices have never been lower so a larger array on your home or business is extremely easy to cashflow. The Tax credit has been extended. Power backup is a common request these days and this also an option for Grid tied systems. Typically these systems are designed around a few basic criteria, Mounting location, Utility provider and the appropriate budget to reduce you power bill to what you want it to be.