Oregon-based Grape Solar is now selling grid-tie capable, kilowatt-scale solar photovoltaic systems online via Amazon.  These systems ship in various bundles which include a racking system, an inverter, and several 230-watt panels, depending on the size of the system.

For example, the 2.3 kW system is $9,999.99 ($4.35 per watt), the 3.68 kW system is $14,999.99 ($4.08 per watt), and the 5.06 kW system is $19,999.99 ($3.95 per watt), not including permits, installation, wiring, or electrical.

The system is marketed in a kind of consumer-direct, DIY manner, but self-installation may not be the greatest idea in the world.  Installation pros can help make sure the array is oriented properly, connected safely, and optimized for the property.