On Sat, Sep 14, 2013 at 08:45:19AM -0700, Bruce EVangel Parmenter wrote: > His evdl profile does not show activity past 2011. > But his has posted in 2013 on the Solectria_ev group > http://groups.yahoo.com/neo/groups/solectria_ev/info > > An old address he used: dexion111 @yahoo.com
Thanks for the lead! This from Kevin (with permission): --- I had 50% fail the second batch. The first batch 100% were bad (couldn't pull more than .5 C without dropping below 2 volts) I replaced the cells 8 or so at a time every 6 months or so once they got down to about 50% capacity with se or yellow ts cells. They seemed to just degrade very fast (some) while others were still over 95ah and fine right next to a bad one. No swelling over charge or over discharge events. They just wore out very fast. They honered the warranty for a while but most if the replacements I paid for. I took several apart that were at 50 ah (from 100) inside they were 5 20 ah pouch cells clamped together. The individual cells were like the a123 cells in appearance but not swelled or damaged. I charged a cell from the 5 a few times. Always came out as whatever / 5 for capacity. So if the cell was 55 ah an individual one was 11 ah. Was hoping to swap out a bad cell from the five to return them to capacity but that never worked out. All 5 pouch cells were equal. I weeded out the bad ones before selling the car and then gave the guy 4 spares as well. I think of the 48 bh cells I had 22 left and they were fine. Rest were ts or se cells. Never had any of those fail and some were older than the bh cells. Only replaced the bh cells. I don't think I would buy them again. Heh. --- And in another message: --- Sure somewhere there was a post where I put some of this info. Interestingly it seems like they plateau around 50 ah when they fail. I had a few buddy pairs never had any issue after pairing them up. Lowest i had was 41 ah so I guess they can go lower but it takes them time. They rapidly went from about 85 to 55 or so. And from 100 to 85 took time as well (slowly) it seemed once they hit 85 I replaced them in the next batch at 55 six months later. I'd mark the ah on each suspect cell and test them every 6 months. It was always easy to see which would go bad. None failed overnight. Far as I know they went out of business 2 years ago. Are these new cells or old used ones or are they back in business. I bought mine about 4 years ago. If they are new perhaps they are different. I'd pull about 55 ah out on my round trip but I'd charge at work. Most I really ever needed was about 40ah at a time. I charged to 3.48 and 5 amps then the charger shut off. So I was undercharging by about 10% any testing however was charge to 3.6 and hold until amps dropped to 5. --- So, these are apparently encased pouch cells rather than the TS, etc "prismatic" type cells. And, with a reputation that justifies them being no longer on the market :-(. -- Willie, ONWARD! Through the fog! http://counter.li.org Linux registered user #228836 since 1995 Debian3.1/GNU/Linux system uptime 61 days 22 hours 45 minutes _______________________________________________ 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)
