Sorry... I posted the details a long time ago. Photo of it on top of the mountain today: http://sphotos-a-lax.xx.fbcdn.net/hphotos-ash3/1240063_605592482816967_962234180_n.jpg
For current reference: It's a 1973 VW superbug with the e-volk #2 kit... http://www.e-volks.com/about2.html? It was an "interesting" conversion that was virtually undriveable when I first got my hands on it. Some odd design choices too (for example, the original starter motor was left attached to both the ignition key and the transmission... so everytime you "started" it, the 12 volt starter motor would rev up briefly -- I thought it was sending a surge to the main drive motor when you started it, but then found that. Hmm......... could probably lose 10lbs by taking that out. Controller is the Alltrax 7245 Motor is 6.7" series DC by D&D direct coupled to transmission -- in this case, I can shift through all the gears just fine without a clutch, except 1st I have to rev the motor a tiny bit to get it in there if it's moving already and I'm downshifting from 2nd. Batteries are 12 volt 100AH AGM UPS batteries http://www.npstelecom.com/pdfs/Dyn_UPS/UPS_12-370.pdf 72 volt nominal system, 74lbs each (444lbs total) + auxiliary battery (which is a standard starter battery instead of a deep cycle... ugh). Those batteries look like pretty high rate batteries... no real idea on how old they are though -- they are used taken out of UPS systems I think... I've added a Xantrex AH meter and some circuit breakers and such, and an Elcon 1200 watt charger. No DC-DC, separately charging the 12 volt auxiliary battery. It's incredibly fun to drive for a few miles now, till the current limit kills the performance... but not quite long enough range to be actually useful yet.... 7 or 8 miles is a long as I'm getting before current limit is shutting it down to snail pace. What do people think of the Concorde AGM batteries? Wondering if that might be an option for new ones. A bank of PVX-1290T would have a 1 hour rate of 79AH, for the same weight as the existing bank. I'd like to do a bank of GNB 100AH lithium batteries, but that would roughly double what the client paid for the car (they got a great deal anyway, just the restored glider was worth what they paid, even if it hadn't had any EV stuff put in yet). Though... that's only about twice as much as a good AGM bank, so maybe it doesn't make sense to do lead. I want to have good options to present to them though. Z On Thu, Aug 29, 2013 at 12:39 PM, EVDL Administrator <[email protected]>wrote: > On 29 Aug 2013 at 11:51, Zeke Yewdall wrote: > > > It seems like it's staying on till about 1.7vpc, and that's probably > > not good for the batteries to drop below that, right? > > The rule of thumb for lead is that you stop (or reduce load) when the > battery voltage under load falls to 1.75 volts per cell. You hope that > will > prevent cell reversal. It doesn't always. > > As for where to go, I'd start with replacing the one battery that read low. > That's probably just a quick fix, though. > > Some kinds of AGMs can deliver huge currents with aplomb and are suitable > for fast, short range EVs. Others are hardly much better than the infamous > flooded marine batteries that die in a few months of such use. But you > don't say what the batteries are (or if you did I've forgotten). > > Could you remind us of such matters as vehicle weight, what batteries > you're > using, what motor, what controller? > > This is a Beetle, right? I'm pretty sure I remember folks back in the late > 1970s and 1980s building Beetles with 72v golf car battery packs. They > gave > up the back seat to batteries, of course. However, I checked the EV Album > (searched with startpage.com, as Evalbum search wouldn't work for me) and > found only this one, I guess originally converted by Lawrence Rhodes : > > http://www.evalbum.com/1466 > > And another with 8v golf car batteries : > > http://www.evalbum.com/1689 > > 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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130829/53d23bc1/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)
