Originally posted by zeeblebot
so 25 mil for 32 megawatthours of storage, wonder why they put it like they did, 4 mw for 8 hours? Anyway, $780,000 per megawatthour of storage. Wonder how that would stack up to other forms like inertial storage (flywheels in a vacuum) or pumping air into an underground sealed cavern or some such? I guess they put the storage figures like that to show how much energy it could supply at night after PV cells would poop out.
If you figure an average of 2,000 watts 24/7 as the energy requirement of a typical family, then that battery would provide 1 1/3 megawatts for 24 hours which would be enough for one day for 650 families. For 8 hours, it would be enough for 2600 families. Call it 2500 families and we get a bill of about US$10,000 per family for this service.
What can we buy for 10,000 bucks that can store 16 Kwhr of energy? How many auto batteries would that take for instance? 16 Kwhr= 2000 watts for 8 hours. A number of something like 1 Kwhr for an average car battery comes to mind, if so, then 16 car batteries would do the trick, of course that would have to be converted to 110 AC 60 Hz or 220 volt AC 50 hz to feed houses which would add quite a bit to the price, probably 4 or 5 thousand bucks for the elctronics alone. 16 batteries at say 100 bucks per, 1600 bucks plus 5K for converters=6600 bucks. Anyone want to verify these numbers?