Mark, I presume that your boat engine has an alternator and is generating 14v as long as it keeps running, so not too likely that your boat suddenly dies in the middle of the lake, but good to have backup.
That said, your 4lbs battery probably has between 200 to 300 Wh of capacity at best, using normal density numbers. At 12.8v this means probably 15 to 20 Ah so the usual Chinese twice (or more) overspec. Cor. On Fri, Aug 10, 2018, 8:29 PM mark hanson via EV <ev@lists.evdl.org> wrote: > Hi Folks, > > > > I was curious if anyone has used/evaluated the Shorai LiFePO4, Lithium Iron > Phosphate LXF35L3-BS12 I bought from Amazon $250 with charger/balancer $67 > for my HondaBFP60 boat (1000cc similar to large motorcycle) claims 550 > cranking amps, 36ah but only weighs 4 lbs so probably Chinese inflated > specs. Looks more like 7-14ah MC battery. It does start the engine with > little voltage sag, 11V whereas the lead battery sags to 8V when starting. > > > > I'm concerned that it may suddenly die out in the middle of the 80 mile > lake > here Smith Mountain Lake near Roanoke, VA so keep a spare tractor battery > on > the boat just incase. I replaced a 40lb lead marine battery to save some > weight but curious about the longevity and how LiFePO4 dies, if it's sudden > or gives some warning like lead (that gets gradually saggy when starting). > > > > 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/20180810/8f64c602/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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180810/05388e7c/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)
