Hi Charlie,
You can see in my other post that I don't find cycle life as very relevent to the way I use my boat. But I've done that sort of math before, I just don't find the final number particulary useful.
I'm pretty aware of the considerations for LFP, my TS cells have been in operation for 2 years. I'm top balancing with EV Power BMS modules but other than that, they've been fairly trouble free. You might have seen a recent article in Practical Sailor (May 2011) on "AGM vs Lithium in the real world". You can see in that article that I beleive in the Lithium value proposition, but for many sailors, the reasonably priced (?) DIY LFP installations may be "still a little gadgety".
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "The_BearBoat" <cjohnson@...> wrote:
>
>
> Eric-
> Good analysis. I suggest to really perform an apples to apples comparison that the life cycle cost needs to be calculated. Assuming the following discharge/charge cycles:
> FLA: 500
> AGM: 800
> LFP: 2000 (mfgrs. are stating 3000, but...)
>
> and using your figures for cost per usable Wh yields the following cost/usable Wh/cycle:
>
> FLA: $3.66 x 10^-4
> AGM: $4.46 x 10^-4
> LFP: $2.81 x 10^-4
>
> Consider the maximum charging rates is also enlightening:
> FLA: 0.2C
> AGM: 1.0C
> LFP: >1.0C
>
> LFPs are NOT plug and play. They take relatively intense involvement by the operator to ensure maximum cycle life and safe operation. However, in the cases where high discharge rates, large capacity, and minimized footprint and weight must be considered, they are a game changer.
>
> Charlie
> JTB Marine Corporation
>
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