I think you might have two problems running at lower voltage. First, I am not completely familiar with the Curtis controllers, but I think I have heard they are fussy on the low side of their voltage range.
Second, you would need more current out of the cells and controller to get the same performance with the lower voltage. Depending on the lithium cell size and composition, you might have trouble with that. My 100 Ah ThunderSky cells really don't put out more than 200A. Happier with 100A. Mike On December 20, 2015 11:14:46 AM MST, Charles Galpin via EV <ev@lists.evdl.org> wrote: >For the group - what’s the feasibility of running this on a 76V lithium >ion pack? The specs on his controller say 96V minimum or can you >actually go lower? If I got something like this Curtis 1253-8002 would >it perform ok at the lower voltage? If you retained the clutch I’d >imagine it would by using the full gear range, just not as peppy? > >http://www.thunderstruck-ev.com/curtis-dc-controller-used-en.html ><http://www.thunderstruck-ev.com/curtis-dc-controller-used-en.html> > >I have 24 x TS-LFP400AHA (used and really unknown condition) batteries >that it would be nice to be able to use in this but I am not sure it be >a good idea (assuming I can make them fit without too much trouble). > >Josh, is it drivable, enough for a test drive? Would you trust a >teenager driving it after replacing the pack? > >Thanks, >charles > > >> On Dec 20, 2015, at 3:14 AM, brucedp5 via EV <ev@lists.evdl.org> >wrote: >> >> >> >> [ref >> >http://electric-vehicle-discussion-list.413529.n4.nabble.com/FS-2002-Ford-Focus-EV-conversion-2500-tp4679247.html >> (See this evdl post for all the technical details) >> ] >> >> % IMO Replacing the batteries is not a reason for Josh to label the >EV a >> 'project' car. Assuming the existing old pack still has enough life >to drive >> a 1 mile test loop to show it is a functioning EV, it would be easy >enough >> to buy 14 8VDC lead-acid batteries (for about $1400) and drop them >in. >> >> So, what else could need work to make Josh use those words? >> (Below is his reply> nothing really) >> >> >> *Bottom line: IMO I would not call this a 'project EV' as it needs >little >> effort to get the EV back to being a daily driver again (just a new >pack). >> From what I can see, this is a nice clean Focus conversion-EV that >just >> needs a new 144VDC (x14 8V PbSO4 $1400) pack. >> >> >> If you were to buy this EV, you would transport it home, document >> (write-down) all the battery cabling orientation as a diagram (which >way are >> the + & - battery terminals oriented, etc.), then remove the old 8V >> batteries placing them out for pick up. Clean up the racks and cable >ends, >> and order replacment 8V batteries which you would buy locally for a >better >> price and fresher pack (all the same manufactured date). >> >> Buying 14 8V batteries from one source should be cheaper than buying >> individual batteries and a better idea. While 'Trojan' is the best >and most >> costly >> >http://bradsgolfcars.com/golf-car-batteries/trojan-t-875-8-volt-golf-car-battery/ >> , look for a 'US_Battery' dealer near you. Most likely they will sell >you 14 >> 8V batteries, deliver them and pick up your old pack at the same time >(they >> give a discounted price if they get a dead battery for each new >battery). >> >> Then using the documentation and cabling diagram you made, put the >new >> batteries in place oriented correctly, and then cable them up. The >pack >> voltage should be about 144 VDC. Put them on a light charge, and >*after they >> are fully charged, you can add 'distilled water' to the cells (to the >ring). >> After a week of driving, check the battery lugs for tightness, and >check >> them there-after when you do your pack's monthly cell-water-level >checks. >> >> Here are some of the large images from his evalbum listing: >> http://www.evalbum.com/popupimg.php?18286 >> http://www.evalbum.com/popupimg.php?18287 >> http://www.evalbum.com/popupimg.php?18290 >> http://www.evalbum.com/popupimg.php?18291 >> >> Contact the seller (not me): Josh Wyatt >> e...@wirefall.org evdl AT wirefall DOT org >> http://www.evalbum.com/3493 >> % >> >> >> {brucedp.150m.com} >> >> >> >> >> -------------------------------------------- >> On Sat, 12/19/15, Josh Wyatt <jdwy...@wirefall.org> wrote: >> Subject: Re: EV for sale >> Date: Saturday, December 19, 2015, 4:23 PM >> >> Honestly, that's about it. It could use new tires, maybe. The tires >on it >> have tread, should pass inspection, and hold air, but they will need >> replacing in the next few thousand miles. >> >> The battery racks would probably need rework, when changing packs. >Some >> cleanup and repainting - the truck bedliner paint I applied before >> installing the pack has suffered the usual lead-acid treatment. It >should be >> structurally sound, though. >> >> I had lots of plans for the car- restoring the air conditioning, for >> example. Adding an overspeed limiter. Stuff like that. It's actually >a very >> nice car for a home conversion, in my opinion. >> >> It has set for a couple of years, but I occasionally power it up >using a >> smaller pack to check things out. I just can't drive it. >> >> I am very happy to answer any and all questions about the car. >> Thanks, >> Josh >> - > >-------------- next part -------------- >An HTML attachment was scrubbed... >URL: ><http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20151220/892f9e0b/attachment.htm> >_______________________________________________ >UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >http://lists.evdl.org/listinfo.cgi/ev-evdl.org >Read EVAngel's EV News at http://evdl.org/evln/ >Please discuss EV drag racing at 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
