> > Yes, I know about deep-cycle batteries, but it should be fully
> > acceptable to discharge a standard (starter) automotive battery to
> > some level.
> >
>=20
> Starting batteries HATE this kind of service.  While you "can" do it, it =
will result
> in a very short service life.
> I'm trying to understand why buying one type of battery which is readily =
available
> is so much preferable to you over another type of readily available batte=
ry.

AIUI he already has several standard car batteries available.

I would be tempted to set up three of them with a diode arrangement, and so=
me form of timer that is run from the first one, operates a relay to turn t=
he second one on after 24 hours, which won't back feed the first one becaus=
e of the diodes, and then after another 24 hours turn on the third one whic=
h won't back feed the first two because they have diodes. That should just =
about get you through the four days if you can find some suitable latching =
relays so you don't need continuous coil current.
--=20
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--=20
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