On Sun, Jun 28, 2009 at 7:54 PM, ahmet erkan <[email protected]> wrote:
> 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 > I don't know how to begin explaining how bad an idea that is. Using wire, as a current limiter is unadvised. The temp rating of the insulation is irrelevant. The wire will heat up, and likely melt. > > > > 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]: > > > > > > 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* > > _______________________________________________ > > Liveaboard mailing list > > [email protected] > > To adjust your membership settings over the web > http://www.liveaboardnow.org/mailman/listinfo/liveaboard > > To subscribe send an email to [email protected] > > > > To unsubscribe send an email to [email protected] > > The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ > > > > To search the archives > http://www.mail-archive.com/[email protected] > > > > The Mailman Users Guide can be found here > http://www.gnu.org/software/mailman/mailman-member/index.html > > ------------------------------ > Hotmail® has ever-growing storage! Don’t worry about storage limits. Check > it > out.<http://windowslive.com/Tutorial/Hotmail/Storage?ocid=TXT_TAGLM_WL_HM_Tutorial_Storage_062009> > > _______________________________________________ > Liveaboard mailing list > [email protected] > To adjust your membership settings over the web > http://www.liveaboardnow.org/mailman/listinfo/liveaboard > To subscribe send an email to [email protected] > > To unsubscribe send an email to [email protected] > The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ > > To search the archives > http://www.mail-archive.com/[email protected] > > The Mailman Users Guide can be found here > http://www.gnu.org/software/mailman/mailman-member/index.html > -- http://neon-buddha.net
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