You could go with ebike/RC components and save a lot of $. Kelly Controllers, ebike hub motors all around (if you aver automotive wheels for bicycling gear). You probably only need a couple HP per person. There is a big uptick in the power needed if you design for 40mph continuous v 25 or 30mph continuous and short 40mph peaks. The tricky part is taking off from a stop which is where a pedal assist is a savings. If the land is flat that is a plus. All the components are smaller, lighter, cheaper if you don't supersize.
48V packs, I got a 20AH pack off of Alibaba for $450 - including BMS, charger, and a bag. So far very good for a year. These are LFP laptop cell sized ones with welded straps for connections. Reliable. Slightly smaller than the size of a group 24 battery. On Fri, Jun 6, 2014 at 4:43 AM, Cor van de Water via EV <[email protected]> wrote: > I am assisting someone to design a light 3-wheel EV that should be able > to run city speeds, > > no more than 40 MPH is needed and the weight will probably be under 1000 > lbs (plus occupants). > > Not very aerodynamic but that should not be a problem at these speeds. > > I have some idea of what components can be used - battery pack should be > Lithium to allow > > a good range and the voltage can be selected to match the performance of > the motor/controller. > > At a minimum (to maintain constant speed) I am estimating about 3kW of > power is needed, > > for (leisure) acceleration and hill climbing I am estimating about 10kW > peak power. > > Since price is an important design criterium, my inclination is to see > if one of the kits > > to give Golfcarts higher performance would be sufficient - most likely > that or a similar > > DC motor setup will be used for this design. This means probably a > battery pack of > > between 48 and 72 Volts. If necessary field weakening to get the motor > the higher > > performance needed for acceleration (like a kick-down) while normal > operation on > > the nominal voltage will give the more steady-state performance at lower > current. > > > > Any other recommendation for affordable yet durable motor and > controller? > > It is expected that the vehicle must be capable to run 200k mi without > frequent overhaul. > > > > Thanks for any advice, > > Cor van de Water > Chief Scientist > Proxim Wireless Corporation http://www.proxim.com > <http://www.proxim.com> > Email: [email protected] Private: http://www.cvandewater.info > <http://www.cvandewater.infom> > Skype: cor_van_de_water Tel: +1 408 383 7626 > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140606/63964d70/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) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140606/37ea5230/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)
