On 25 Jul 2015 at 14:11, Willie2 via EV wrote: > can anyone give me a good estimate of the number of ah one can pull > from a lead golf cart battery?
It depends on current, but usually the reserve capacity is a good rough estimate in normal golf car use. For example, a T105 type battery with a 115 minute RC will deliver about 115ah. Here is how this works. At the standard RC current of 75 amps, 115 minutes is 1.92 hours. Then 1.92h * 75a == about 144 amp-hours. Then take 80% of that for decent cycle life, or about 115ah. With your bike packs, the golf car will be much lighter, and therefore will use less energy per unit of distance. This will partly offset the lower battery capacity, though 40ah (32ah at 80%) is a long way from 115ah. If you're using LiFePO4, its voltage curve stays high longer than lead's, so your golf car will seem peppier right up to the point where you should have stopped discharging it already. As I'm sure you know, taking it right down to where the protector cuts off is not recommended for long cycle life. I have 24v (actually 25.6v nominal) and 36v (38.4v) LiFePO4 batteries by Ping. I have never hit the overdischarge protection. I stop using the 24v when they hit 21 volts (about 2.6 vpc) under load, and the 36v when they fall to 31v under load. Or, when I've used 80% of their rated capacity, whichever comes first. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ 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)
