utgg wrote: > I disagree. I think the author understands the scientific principles > very well; the undertone of the article is very much about energy > storage being an very important part of a renewable energy future. > Numbers are important though - and this article fails to put the few > numbers it has into proper context, as is usual... Some numbers I can > see there are: current battery storage is 100GWh, expected to increase > to 160GWh by 2020 - these are meaningless figures to most readers. > Better is "Musk calculated it would take roughly 2 billion Powerpacks to > electrify the entire world". If those are his 10kWh packs, I make that > 2e13 Wh of storage capacity, or 200 times current battery storage > capacity above. I big step up, but doable I guess. Is even that enough > though? > > Here's some numbers I've just extracted from > http://www.iea.org/publications/freepublications/publication/keyworld2014.pdf > : > 2012 total annual worldwide energy consumption: 1.04e17 Wh/year. Only > 20% of that is electricity, the rest of it is basically fossil fuel > burnt at point of use in an engine, for heating or some chemical > process. In a renewable energy future the whole lot would essentially > need to be electricity. And that number is only going to get bigger... > Musk's 2e13 Wh of storage would keep the world running for 100 minutes. > I'd venture to suggest that at least a whole day's worth of storage > capacity would be needed to buffer out the variability in solar and wind > power. I.e. 14 times as much as Musk suggests - 28 billion of his > Powerpacks or 2800 times current battery storage capacity... > > Perhaps a more practical energy storage technology is kinetic energy > storage, ultimately in the very useful form of a Launch Loop: > http://launchloop.com/PowerLoop.
Okay I accept your comments but once again there is the issue of switching from fossil fuel being consumed at the point of use to electricity. And where is that electricity going to come from? My point is that that electricity cannot come from all these batteries since these batteries are STORAGE batteries, i.e. batteries that storage electricity rather than batteries that generate electricity, and as such these batteries need the electricity that they store to come from another source. So for example all those Tesla "free" charging stations have to get the electricity from somewhere, whether the Tesla owner has to pay to recharge the battery or not. Presently in the US the percentage of electricity that is generated from fossil fuels is 67% (http://www.eia.gov/tools/faqs/faq.cfm?id=427&t=3) and regardless of how many STORAGE batteries and electric cars there are this percentage will not change all that much. So please explain how STORAGE batteries are going to save the world from climate change being caused by burning fossil fuels? Living Rm: Transporter-SimAudio pre/power amps-Vandersteen 3A Sign. & sub Home Theater: Touch-Marantz HTR-Energy Veritas 2.1 & Linn sub Computer Rm: Touch-Headroom Desktop w/DAC-Aragon amp-Energy Veritas 2.1 & Energy sub Bedroom: Touch-HR Desktop w/DAC-Audio Refinement amp-Energy Veritas 2.0 Guest Rm: Duet-Sony soundbar Garage: SB3-JVC compact system Controls: iPeng; SB Controller; Moose & Muso Server: SBS on dedicated windows 7 computer w/2 Drobos 'Last.fm' (http://www.last.fm/user/jazzfann/) ------------------------------------------------------------------------ ralphpnj's Profile: http://forums.slimdevices.com/member.php?userid=10827 View this thread: http://forums.slimdevices.com/showthread.php?t=104207 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
