As a policy matter, it makes no difference. Neither can accomplish our goals by themselves. Both BEVs and FCEVs are needed. (That's CARB's opinion, not something I made up).
And the appropriate comparison is to an ICE, which is the baseline we are reducing. And the key is tailpipe emissions, which is zero for both of them. That was the genesis of the ZEV mandate. Efficiency is important for other reasons, but that is changing, and both significantly reduce from the baseline. How much depends on the source. NREL is the best source for those comparative numbers. However, those don't take into account total lifetime impacts, such as emissions from battery or fuel cell recycling. Sent from my iPhone On May 21, 2014, at 4:26 PM, Mike Nickerson <[email protected]> wrote: > Mark, > > If the energy starts out as electricity (hydro, solar, wind, nuclear), the > efficiency question is very important. > > You will lose about half the energy converting electricity to hydrogen, > compressing the hydrogen for storage, then converting the hydrogen back to > electricity in the fuel cell. Contrast this to the losses by staying with > electricity and storing it in a battery. Much less. > > If you start with fossil fuels, the efficiency is more balanced. You lose > quite a bit of the energy in the generation plant, or the hydrogen production > and fuel cell, but it is about the same in both cases. > > Mike > > > On May 21, 2014 10:41:20 AM MDT, Mark Abramowitz via EV <[email protected]> > wrote: >> See below for a brief reply. >> >> Sent from my iPhone >> >> On May 21, 2014, at 3:58 AM, Chris Tromley via EV <[email protected]> >> wrote: >> >>> Without wanting to get into a detailed FCV discussion here, I'm >> puzzled. >>> >>> 1. Last I heard a practical FCV was not possible until some Brand >> New >>> Stuff was invented, and no one knew if/how/when that would happen. >> >> What time period was this? If recently, you should consider that the >> source was ill-informed. >> >> >>> 2. Last I heard there was no way to create H2 that was anywhere near >> as >>> efficient as just filling a battery with the same energy. >> >> Not sure why you want to compare efficiency of filling a battery to >> anything. > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
