andrewducker: (Default)
andrewducker ([personal profile] andrewducker) wrote2017-11-24 12:00 pm

Interesting Links for 24-11-2017

[personal profile] nojay 2017-11-26 11:13 am (UTC)(link)
The Australian Tesla battery is not the world's "biggest", not by a long chalk. NGK has had a battery farm with double the capacity (245MWh) of the Tesla battery running alongside a small wind farm in Rokkasho in Japan for nearly a decade now, but it's not a Musk project and not promoted heavily by the tech press so it probably doesn't count.

NGK's battery tech is based on sodium-sulphur electrochemistry rather than lithium and they're more expensive per MWh but they should, I repeat should last decades in operation unlike lithium-based batteries. NGK may have solved the "bursting into flames" problem that bedevilled their first-gen Na-S batteries. Lithium tech is good for mobile operation but its advantage of high capacity per kilogram is not much use in static operations such as backing up intermittent solar and wind generation.
danieldwilliam: (Default)

[personal profile] danieldwilliam 2017-11-27 11:34 am (UTC)(link)
Elon Musk does have a certain genius for cornering the market in publicity.

I'm not entirely sure all his business ventures are as much of a shoe-in as they are generally considered.

I think where he's going with the industrial scale storage is that he expects to have large volumes of used lithium-ion batteries returned to him as part of his car business which can be refurbished and sold again at a lower spec as part of a static storage array.

You are, or course, entirely correct about industrical scale static storage not benefiting much from very good energy density by volume or mass. Lifespan is a more important consideration.

I think that the cheapest energy supply and storage model might well turn out to be turning excess solar PV in to natural gas and then re-burning that but we'll know more in ten years once the biggest shifts in cost have happened.