I don't remember how much it all cost exactly and I'm sure prices are different that a couple years ago. A few thousand for sure. I have a used inverter that basically fell into my lap for a good price, everything else is new. I built the panel racking out of what I already had and I already had a box for the components. Basically you need panels, charge controller, batteries, and inverter plus breakers, wire, panel racking, and some other stuff depending on what you want. Lightning arresters for example. The wire and connectors added up to more than I expected so if you can scroung around you might be able to save some money.