edatoakrun wrote:GRA wrote:RegGuheert wrote:...Of course it's a very dumb idea to throw away 2/3 of that "excess". A much better idea is to keep nearly all of that excess and charge BEVs or other batteries instead.
As long as you don't have any more excess than you can use immediately for charging...RegGuheert wrote:... The material costs of batteries quickly outstrip the costs of fuel-cell storage at rather quickly as storage time increases...
What you both seem to be overlooking is that as BEVs replace ICEVs, there will be an ever-increasing supply of inexpensive used cells that have second-life applications in stationary storage installations.
And as new battery costs per kWh continue to fall, used battery prices will probably soon reach very low prices per kWh.
Every significant BEV manufacturer world-wide (except TSLA, for obvious reasons) has already begun repurposing programs for their used packs.
Meaning large-scale hydrogen conversion of electricity for energy storage, is nearly certain to wind up as just another economically non-competitive pipe dream from the Hydrogen lobby.
Not overlooking it at all, e.g.
http://www.greencarcongress.com/2018/06/20180627-hmg.htmlHyundai Motor Group and Wärtsilä partner on second-life electric vehicle batteries
I'm a huge fan of re-purposing, but until someone gets some life-cycle cost data, the long-term viability of this approach is as speculative as ultimate battery prices or cost-competitive with fossil-fuels H2, and the likely size of the storage needs in a full shift to variable intermittent renewables dwarfs the numbers mentioned in that article.