Philip Pemberton wrote:
> Then there's the discharger and relay driver to deal with... Ideally I wa=
nt
> some kind of reverse-polarity protection on the relay driver -- if the
> battery is hooked up backwards, the O/P relay will refuse to switch over.
> That's a job for later though... mainly because I can't think of a sane w=
ay
> to do it.

The first thing that crossed my mind was to have a "master disconnect" rela=
y;
DPST in series with both battery leads. If its coil is low-power enough, it
could be driven by the battery itself through a diode; otherwise, use an
optoisolator to detect polarity on the battery side and use its output to
drive the logic that turns on the relay(s).

-- Dave Tweed
--=20
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