Being an idiot does not make you a 'troll'. To me, the word 'troll' has some negativity attached. To be a moron is purely innocent kermudgeninuity.
So... about that windmill on top of the car... ~<:| On Fri, Feb 15, 2013 at 5:29 PM, Bruce EVangel Parmenter < [email protected]> wrote: > The originator of the thread is not subscribed to the evdl. They are > only subscribed to the evdl nabble archive. They need to get properly > subscribed to the evdl so everyone receives their.post. Many a troll > that has been dropped from the evdl, still troll in other ways (only > valid evdl subscribed members are what I feel safe in responding to). > > > {brucedp.150m.com} > > > - > On Fri, Feb 15, 2013, at 03:20 PM, James Massey wrote: > > At 05:46 AM 16/02/2013, you wrote: > > >Pretty sure the laws of physics apply as well in the UK as in the US. > > > > > >If you charge a battery using an alternator driven by the battery you're > > >charging you'll just waste an extra 25% of your energy. > > > > > >You don't get power for free. > > > > Since the original message has yet to hit the EVDL, from the Nabble > > archive: > > >[what if I sourced a front wheel drive (UK) ford focus, removed the > > piston engine, fitted a 72v forklift motor and 6 x 12v batteries with > > a controller, to aid range i thought about fitting a live rear axle > > and power a big 12v alternator off that charging each 12v battery via > > 6 feeds through power diodes (for 1 way flow), the alternator would > > be topping up the batteries at any time the car was moving, when not > > moving the drive motor wouldnt be consuming power.... ]< > > > > This is a basic "newbie" misunderstanding about how this electrickery > > works, and is OK to repeat the explanation now and then, as this is > > what the EVDL is here for. > > > > This is a basic, very non-technical explanation that mis-uses > > electrical units to explain the concept, so: > > > > An electric vehicle is very efficient, about 80% of the energy > > available from the batteries should make it into pushing the vehicle > > down the road. Any added inefficiencies or loads reduces range. > > The original poster asks what happens when an alternator is added to > > the non-driven wheels. Unfortunately any generated energy looses > > 20-40% (or more) before it gets into the batteries, and another 20% > > before getting back to the wheels. > > So you have a vehicle that for example needs 100 amps to hold a > > steady speed on a test road. Adding an alternator to give 20 amps > > back into the battery requires the equivalent of say around 25 amps > > of mechanical energy (being generous about the efficiency) and that > > has to come from somewhere, unfortunately that somewhere is the drive > > motor, which now has to deliver the extra power equivalent to that 25 > > amps - but it is only 80% efficient, so now the drive motor needs to > > pull an extra 30 amps or more, so over 130 amps to maintain speed. > > Your system is putting back 20 amps, so a nett loss of 10 amps and > > reduced range is the result. > > > > However, if you are in hilly country, or in "pushy" stop-and-go > > traffic, where you are on and off the throttle all the time, adding > > such a system can make sense - but you only turn it on when you start > > to brake, so all the power that you get back would be otherwise > > wasted as brake heat. This is regenerative braking, and is used in > > all AC-motor drive systems (that I know of) and a few DC (harder to > > do with DC). > > > > Hope this helps. > > > > Regards > > > > [Technik] James > > > > _______________________________________________ > > 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) > > > > -- > http://www.fastmail.fm - Email service worth paying for. Try it for free > > _______________________________________________ > 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) > > -- Marcus Reddish *North Valley Systems LLC* Stevensville, Montana 406-360-8628 northvalleyev.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130216/83662306/attachment.htm> _______________________________________________ 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)
