For those that have successfully gone off-grid, how many watts?

Bruce all good points. And thats what you do, the grid becomes your battery. I've had 5 black out since going partially off the grid. The neighbors came over asking whats going on? Cost of going into the grid is alot more than you think. Building premit, electrician to sign off the work even if you do it yourself. Disconnects on both sides of the inverter. 2k for the inverter/controller. Plus around here the want it all in a conduit.