Re: Plan repository

[David Roden <roden@ald.net>]

I think one of the most pressing issues is charge control.  Considering the
increasing sophistication of EVs, it's surprising that chargers are only
gradually getting smarter -- and the smart ones are expensive.  

To put in my 2 cents' worth on this issue (warning: I am not an EE), I
think that one of the most promising charge control methods was invented a
good 20 years ago for the Lestronic chargers.  It uses DV/DT rather than
absolute battery voltage to determine state of charge.  Absolute voltage
varies with temperature and battery age, but the slope of voltage rise on
charge is (as I understand it) a pretty stable indicator of SOC.

In any case, I would hope to see an archive such as this with a "Radio-
Electronics Magazine" approach.  I don't mean necessarily a complete
article with PC board layout, parts sources and all the rest (though that
would be nice!).  I mean enough information in each post that
experimenters/hobbyists without formal theory training (enough
understanding to follow a schematic, but not necessarily enough to know the
pitfalls of stuff like lead dress, transient suppression, and such without
being warned) could build the gadget with a reasonable expectation of success.

I think this is a super idea, but I understand that maybe you want to
restrict it to being an info-interchange between the techies.  But I hope
you'll consider making it a bit more inclusive.  Thanks!

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     David Roden          THE VIRTUAL PD         roden@ald.net
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