Energy density is a big one. To store 5 kW * 24 hours (barely enough to power my house's essentials), I would need 286 of these (http://www.amazon.com/VMAX857-Battery-Performance-minnkota-t...). They are not small. Also, that would cost me nearly $32,000 in just batteries.
My ideal setup for this would be something like 20 kW * 7 days. That would fill my basement pretty easily.
My ideal setup for this would be something like 20 kW * 7 days. That would fill my basement pretty easily.