There may be some issues connecting a discharged battery in parallel with a
charged one. Small gauge wire at the proper length with high temperature
insulation might limit the current to an acceptable level.
S/V 8827
Ahmet
> From: [email protected]
> Date: Sun, 28 Jun 2009 14:14:52 -0500
> To: [email protected]
> Subject: Re: [Liveaboard] 12 to 24 volts
>
> On Sun, Jun 28, 2009 at 08:35:44AM -0400, [email protected] wrote:
> >
> > Once upon a time there was available at J C Whitney a relay just for that.
> > The Volkswagen of some vintage had two six-volt batteries under the back
> > seat wired in parallel. The relay would put them momentarily in series
> > (while disconnecting the six-volt feed) sending twelve volts to the starter
> > for cold-weather starting.
>
> That was a cute idea on their part. Again, wiring it up wouldn't take
> much - here, I'll sketch it:
>
> http://okopnik.com/images/flip.pdf
>
> When the relay/switch is in the off/unpowered position, the two
> batteries are tied in parallel, and the watermaker is disconnected from
> the circuit. In the other position, the two batteries are connected in
> series, powering the watermaker.
>
> Do note that if you're charging while running the watermaker, only one
> of the batteries will get charged - which means that your total series
> voltage will start dropping after a while. Solving *that*, however, is
> quite a bit more complex (but does provide one possible answer to "why
> are there 12v-to-12v inverters?" :)
>
> > They may still have this relay available somewhere.
>
> If not, just look for a DPDT relay that can carry at least twice the
> current required by your watermaker.
>
>
> --
> * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
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