Sounds like it's best to keep a spare small battery capable of 450a or ultra caps by Maxwell etc like Lee mentioned. It's a bummer to be in the middle of a big lake and the boat won't start for the next skier. Best regards Mark
Sent from my iPhone > On Aug 12, 2018, at 7:31 PM, Bobby Keeland <keela...@gmail.com> wrote: > > Mark Hanson asked "curious if LiFePO4 dies suddenly or gradually like lead." > > My experience with lead acid batteries in both a Dodge RAM pickup and in a > Subaru SUV is that they were working great when I stopped at the dealership > (Dodge) and pharmacy (Subaru), but when I got back in the vehicles the > battery was dead. No obvious gradual decline. > >> On Sat, Aug 11, 2018, 10:04 AM mark hanson via EV <ev@lists.evdl.org> wrote: >> Thanks Cor, >> >> >> >> Yes, it has a standard 14V alternator regulated. I start and stop >> frequently as skiers are getting in/out of the boat, so curious if LiFePO4 >> dies suddenly or gradually like lead. I assume a small battery like this >> would start fine one second and then not, so I keep a spare battery in the >> boat (unless someone has any real data on this battery, couldn’t find on the >> great god google) . What is the projective life, 1,5,10 years? >> >> >> >> I had an electric boat www.evalbnum.com/2749 >> >> but couldn’t H20 ski behind it so bought a lean burn Honda BFP60, same >> engine that was in my 2000 (real) Insight 65mpg. In the alum 1200lb 6x16 >> boat, gets 6.5MPG which is considered “good” most fiberglass 3400lbs are >> 2.3MPG. >> >> >> >> >> >> 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 >> >> >> >> >> >> >> >> From: Cor van de Water [mailto:cor.vandewa...@gmail.com] >> Sent: Saturday, August 11, 2018 12:19 AM >> To: Electric Vehicle Discussion List >> Cc: mark hanson >> Subject: Re: [EVDL] Shorai LiFePO4 LFX36L3-BS12 Longevity Reviews >> >> >> >> 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/20180811/d878193c/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... 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