[DrPhish]

You can get a 6.5kW system from wholesalesolar (with inverter and gridtie kit) for almost exactly the same price. I don't know what the ikea system is rated for, but I'm guessing less than that. 6.5kW should do for pretty much any domestic residence, clouds or no, assuming you have the room for 24 panels. I'll be picking one of these up once prices dip down to $1/W all costs included (it's about $1.50 right now, with racking still extra)