We've got a car full of them http://users.adam.com.au/marick/=20
http://www.evalbum.com/3765
It has travelled 40000 Km on these cells.
In a few short months it will have travelled more EV Kms than petrol.

We have logged every charge with distance travelled over 3 years if you=20
want any long term data.
Our second cheap charger has recently failed, the new 2Kw charger puts=20
50Km of energy back in 3.3 hours.

Every cell has its own PIC12F683 monitoring the voltage ready to turn on=20
a small load when charging and alarms for over voltage and under voltage=20
you are welcome to the details and code. The Larger LiFePO4 cells are=20
very robust, but don't discharge them too far they will go to 0v and=20
stay there - < ask me how I know />
They gas when flat and that insulates the plates one remedy is=20
compression. You do not float charge, I think it is a plating problem=20
but that's just a guess on my part.

One of the other discussions on this list suggested Lithium cells are=20
only "happy" when being charged or discharged not idle at any level. I=20
have seen it documented that if you are storing them 80% of full charge=20
is the best.

I have been meaning to contribute to this topic but that annoying=20
problem with the ARM processor has taken all my time.

Trevor

> What?
> No users of Lithium Ferro Phosphate "12V" batteries?
> Winston / Sinopoly / Thundersky / CAL / GBS / GWL / BYD / A123  ...
>
> No ebikers / mobile homes / self sufficiency ... aficionados?
>
> LiFePO4 is more cost effective whole-of-life than lead acid.
> Knowing how to optimise this is my interest.
>
> Nobody else playing this game?

--=20
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