Jerry, If the battery is the limit for the power to the motor then it makes sense to add battery to increase that power. If your controller (or your motor) is the limit for the max power you can deliver, then it does not help to add battery power.
Regards, Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.com Skype: cor_van_de_water XoIP: +31877841130 Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 -----Original Message----- From: [email protected] on behalf of Jerry Yue Sent: Sat 6/8/2013 7:14 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] 100ah pack on the cheap Thanks for the clarification. Yes, I know that special design on the motor and the transmission can offer more torque for hill climbing at low current draw. In fact, my own idea is to attach a small powerful lithium batteries (at low cost) to the original lead acid or CALB battery system to offer extra power during hillclimbing and speed acceleration. Will this make any sense ? Jerry On Sun, Jun 9, 2013 at 10:04 AM, Cor van de Water <[email protected]> wrote: > Hi Jerry, > > I am not Al, but I have plenty experience in hill climbing challenges. > My truck weighs about 4400 lbs with its 120V flooded golf cart batteries > (20 of them +2 for the aux) > However, the controller limits the current to about 300A, probably because > the motor has too low inductance > (11 inch GE motor) so the current has high spikes, triggering the current > limit (should be 500A). > The result is a definitely underpowered truck that takes about a minute to > reach max freeway speed. > You can imagine that when I get into the foothills that I need to maintain > speed to reach uphill or > when starting from a stop, I can only *creep* up the steeper slopes. > Does not matter that the batteries are full, there simply is too little > torque to make it up steeper inclines. > > Hope this clarifies, > > Cor van de Water > Chief Scientist > Proxim Wireless Corporation http://www.proxim.com > Email: [email protected] Private: http://www.cvandewater.com > Skype: cor_van_de_water XoIP: +31877841130 > Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 > > > > -----Original Message----- > From: [email protected] on behalf of Jerry Yue > Sent: Sat 6/8/2013 6:40 PM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] 100ah pack on the cheap > > Hi Cruisin, > > Are you using lead acid batteries for your EV ? Do you have any experience > that your battery can't climb a slope while it has plenty of electricity ? > > Jerry > > > On Sun, Jun 9, 2013 at 9:34 AM, Cruisin <[email protected]> wrote: > > > If you want to do it on the cheap, stick with ACID > > > > > > > > -- > > View this message in context: > > > http://electric-vehicle-discussion-list.413529.n4.nabble.com/100ah-pack-on-the-cheap-tp4663470p4663472.html > > Sent from the Electric Vehicle Discussion List mailing list archive at > > Nabble.com. > > _______________________________________________ > > 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) > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130609/515bafc3/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) > > > _______________________________________________ > 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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130609/9fa1da79/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) _______________________________________________ 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)
