I actually designed a circuit that does exactly what you want and I sent a
dozen out to try & provide feedback. I still have some prototypes left if
you want one, just provide feedback please.

Thanks, Tom

From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of
pickle vanagon
Sent: Friday, February 11, 2011 8:59 AM
To: vanagon@GERRY.VANAGON.COM
Subject: battery protector

I know battery issues are done to death, but I was wondering about
something...

I want a little device that will detect voltage from the auxiliary battery,
and cutoff the whole aux circuit panel below some threshold (11.2 volts, or
whatever).

that way, if something gets left on, it can't trash the aux battery too bad.

Any simple devices that I could combine with a relay?  Obviously, I want a
setup with very low operating current, since this will be on all the time.
Ideally it would also have an override switch, but I wouldn't mind adding
that feature manually if I had to.

Thanks for any tips!

  _____

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