“ Not to mention that going form electricity to hydrogen back to electricity via electrolysis and a fuel cell, respectfully, is only ~22-34%... (read full comment) ” 

Posted on March 30, 2010 at 1:35 PM EDT

“ If your concept can beat the round trip efficiency of a simple battery then it makes sense. However batteries are fairly efficient at returning the... (read full comment) ” 

Posted on March 1, 2010 at 12:45 PM EST

“ Comparing it to grid generated electricity is somewhat like comparing it to coal since ~50% of grid electricity comes from coal at ~30% efficiency.... (read full comment) ” 

Posted on February 25, 2010 at 12:17 PM EST