These 3kW size grid-connect solar kits include solar panels, string inverter, and the racking system for roof mount.
An off-grid solar system (off-the-grid, standalone) is the obvious alternative to one that is grid-tied. For homeowners that have access to the grid, off-grid solar systems are usually out of question.
For most homes in the United States this 3000 Watt string inverter kit is more than enough to completely eliminate their bill.