Originally Posted by Lakewood90712
Large scale , it has been done in Japan, even before the Fukashima disaster, using Sodium sulfur battery tech. I don't know id li-on is scaleable on an economic basis. The sodium sulfur tech has low losses in charge/discharge (under 10 %) but I wouldn't want it near my house.
Right, some utilities are looking into this, a few pilot programs are out there. But I do think they use batteries that are much cheaper than Lithium (the sodium sulfur you mention, some kind of iron something or other, probably a few others). Lithium is the choice for portable power because it has the best energy density, but size/weight isn't that important for a stationary application like a utility would be using. Same with safety, not nearly as important when you don't carry it in your pocket, or drive it around a public road.