Thanks Bill,
That's good to know you operated the van with A123 cells for 10 years. I tried the pull start cord on the 60HP 1000C engine but no-way I could pull it fast enough, just got one revolution. I have a similar RC charger I use for Ben's Battlebots, could try and I bought a $70 individual cell charger with the battery. Date: Mon, 13 Aug 2018 12:23:25 +1200 From: Bill Dube <billd...@killacycle.com> To: ev@lists.evdl.org Subject: Re: [EVDL] Shorai LiFePO4 LFX36L3-BS12 Longevity Reviews Message-ID: <997d32c0-9ab7-ca12-5397-bb6023a02...@killacycle.com> Content-Type: text/plain; charset=utf-8; format=flowed On 8/13/2018 11:31 AM, Bobby Keeland via EV wrote: > Mark Hanson asked "curious if LiFePO4 dies suddenly or gradually like > lead." > ??? The cranking power (specific power, internal resistance) stays relatively flat over the lifespan, at least in A123's. The capacity (specific energy) declines slowly of the life span. They "die" when they don't have the energy needed to crank for sufficient time, which tends to happen suddenly when you reach that threshold. The battery doesn't die suddenly, but its capacity is suddenly inadequate. It won't, for example, crank the extra time needed to start a cold engine. ??? I built a 4S3P 12 volt battery for my ICE van out of A123 cordless tool cells. It lasted for about 10 years. Probably would have lasted longer had I not left it at zero volts for several days a couple of times. ??? You can check the health (capacity) of the battery by periodically putting it an RC type cell cycler, like a CellPro: http://www.usastore.revolectrix.com/Products_2/Cellpro-Multi4_3/Cellpro-Mult i4_1089 ??? "Death" will then happen predictably, when you see that capacity begins to approach whatever it takes to crank and start up your motor. Bill D. ??? Does your engine have a pull start, or is it way to large for that? Have a renewable energy day, Mark Mark E. Hanson 184 Vista Lane Fincastle, VA 24090 540-473-1248 phone & FAX, 540-816-0812 cell REEVA: community service RE & EV project club Website: www.REEVAdiy.org (See Project Gallery) UL Certified PV Installer My RE&EV Circuits: www.EVDL.org/lib/mh FREE Solar EV Charging! ; http://www.WeatherLink.com/user/MarkHansonREEVA -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180815/bb24f1ac/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
