Thanks, David, that sounds like a good fit. Sounds like the 40AH I was looking at are way overkill.
They ship in 2 to 3 weeks - sounds like they are not stocking, just brokering for a Chinese manufacturer. This is all speculation, because I may like the Pb cells in it just fine. I wonder how much they would cost. I am not familiar with buying lead batteries, except from the auto parts store. On Mon, Apr 28, 2014 at 10:00 PM, David Nelson <gizm...@gmail.com> wrote: > I picked up a B&D 24V push mower for free. It needed batteries and a > charger. I removed the charging circuit & batteries and replaced the > batteries with two sets of GBS 20Ah > ( > http://www.kta-ev.com/Battery_4_GBS_3_2V_20AH_cells_p/bat-gbs-lfmp20ahx4.htm > ) > which are an almost exact size replacement for the lead acid > batteries. I installed a self powered digital volt meter in place of > the old analog meter and carefully bottom balanced the pack. I know > when to stop mowing when the voltage reads 20V when not cutting grass. > They bounce back to just over 3V per cell. I don't have a charging > plug yet so I still have to remove the cover and charge the batteries > with my bench power supply. Charging to 3.4V per cell average means I > don't have to worry about overcharging the cells. Yes, I checked. It > seems like it just runs for ever. It could mulch mow the yard of a > 1200 ft^2 ranch style house on a 6000 ft^2 lot (I'm not sure of the > lawn area) and still have energy left. > > On Mon, Apr 28, 2014 at 9:58 AM, Michael Ross <michael.e.r...@gmail.com> > wrote: > > I have an old simple ICE push mower, that might be worth converting. > > > > Can anyone recommend the sort of motor I should look for? > > > > Re-purposing a motor would be nice. > > > > I would use LFP batteries. > > > > What about the shock of the blade hitting something nearly immobile? That > > is a lot of shock that small engines are able to handle - special > > consideration in the regard with electric motors? > > > > Mounting the blade seem non-trivial? Hints? > > > > Thanks! > > > > I just saw a Li ion powered mower on line for $500. supposed to run for > 45 > > minutes and charge back in 30. That sounds like a practical target. 48V > > pack. Weighs 62lb. > > > > Any thought on this side of the equation? 36V? 60V? Capacity needed to > > go 45 minutes? > > > > -- > > Don't believe everything you read on the Internet - Abraham Lincoln > > > > 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 > > > > michael.e.r...@gmail.com > > <michael.e.r...@gmail.com> > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140428/7e307136/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) > > > > > > -- > David D. Nelson > http://evalbum.com/1328 > http://www.levforum.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) > > -- 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 michael.e.r...@gmail.com <michael.e.r...@gmail.com> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140428/3a32ea13/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)
