This time the tech has advanced and new battery chemisty is available. I just took delivery of 24 Aquion batteries (http://aquionenergy.com/) and now have to run off and rent a hoist to move them into place. These are managanese and nanocarbon.
I don't do any electrical generation. But I still have a stab of "ooh, not fair, he's getting all the cool toys!"
(And I wonder how this stacks up next to Tesla's home battery? It looks like they're far bigger and clunkier - but also far better.)
There are several differences. The Aquion manganese/saltwater/nano-carbon chemistry is lower density than Lithium Ion chemistry. So yes, for the same capacity the Aquion batteries are bigger than the Tesla ones. That works out OK in home usage. The positive for Aquion chemistry is that it does not suffer thermal runaway ever. The Tesla home battery system has a lot of active individual cell cooling tech to stop the runaway explosions from happening.
Here's a review of several battery systems: http://www.cleanenergyreviews.info/blog/2015/11/19/complete-battery-storage-comparison-and-review
"Thermal runaway" definitely didn't sound *good* but then you got to the part about "explosions". And then I flashed on https://xkcd.com/651/, and realized that if a laptop battery has the energy of a "grenade"... yikes.