## DPDT to switch Series/Parallel batteries

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• Been trying to wrap my head around this for a bit but wind up going in circles. Does anyone know a way to use a single DPDT switch to switch 2 batteries
Message 1 of 6 , Nov 28, 2007
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Been trying to wrap my head around this for a bit but wind up going in
circles.
Does anyone know a way to use a single DPDT switch to switch 2
batteries between series and parallel?
Thanks
• ... Sure bit ASCII art doesn t work so... Place two batteries side by side on the table with the + end away from you. Mentally, connect the + of the left
Message 2 of 6 , Nov 28, 2007
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--- In Electronics_101@yahoogroups.com, "Rob" <robd@...> wrote:
>
> Been trying to wrap my head around this for a bit but wind up going in
> circles.
> Does anyone know a way to use a single DPDT switch to switch 2
> batteries between series and parallel?
> Thanks
>

Sure bit ASCII art doesn't work so...

Place two batteries side by side on the table with the + end away from
you.

Mentally, connect the + of the left battery to your + output, it is
never switched.

Connect the - of the right battery to your - output, it is never switched.

For the series connection, one pole of the switch will connect the +
of the right battery to the - of the left battery. It is important
that the + connection of the right battery go to the center of the switch.

For the parallel connection, the other side of the switch centered on
the + of the right battery now connects to the + of the left battery.
The second pole of the switch connects the - of the left battery to
the - of the right battery.

You can draw the thing using colored pens.

Richard

For the parallel connection, one pole
• In a message dated 11/28/2007 1:49:43 P.M. Central Standard Time, robd@ocis.net writes: Does anyone know a way to use a single DPDT switch to switch 2
Message 3 of 6 , Nov 28, 2007
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In a message dated 11/28/2007 1:49:43 P.M. Central Standard Time,
robd@... writes:

Does anyone know a way to use a single DPDT switch to switch 2
batteries between series and parallel?

Easy, but HOW can I explain with just WORDS??? Lemme try: Two cells, "A"
and "B". + of both at top. 6 terminals of a DPDT switch between the cells.
Center two are the "wipers". Label these 6 pins thus: 1 and 2 at the top; 3
and 4 (wipers) in the middle; and 5 and 6 are the bottom two terminals of
the switch. Call the + of cell A the "+out" and the - of cell B the "-out".
Now, connect the - of cell A to terminals 2 AND 5, and the + of cell B to
terminal 4. Tie terminal 6 to "+out". Tie terminal 3 to "-out" Terminal 1 is
not used! (This is what breadboards are for!)

I THINK this is right. Draw/trace it yourself! Jan Rowland

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• Awesome guys. Thanks very much. So simple now that I look at it. -Rob- ... in
Message 4 of 6 , Nov 28, 2007
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Awesome guys. Thanks very much. So simple now that I look at it.
-Rob-

--- In Electronics_101@yahoogroups.com, "Rob" <robd@...> wrote:
>
> Been trying to wrap my head around this for a bit but wind up going
in
> circles.
> Does anyone know a way to use a single DPDT switch to switch 2
> batteries between series and parallel?
> Thanks
>
• Those switches had better be break before make or you ll burn the switches out quickly and drain your batteries. Steve Greenfield
Message 5 of 6 , Nov 30, 2007
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Those switches had better be "break before make" or you'll burn the
switches out quickly and drain your batteries.

Steve Greenfield

--- In Electronics_101@yahoogroups.com, "Rob" <robd@...> wrote:
>
> Awesome guys. Thanks very much. So simple now that I look at it.
> -Rob-
>
> --- In Electronics_101@yahoogroups.com, "Rob" <robd@> wrote:
> >
> > Been trying to wrap my head around this for a bit but wind up going
> in
> > circles.
> > Does anyone know a way to use a single DPDT switch to switch 2
> > batteries between series and parallel?
> > Thanks
> >
>
• I ve done something like this before with computer fans. I ran 2 fans off 12 volts, then had a DPDT switch to flip them between series and parallel, giving me
Message 6 of 6 , Dec 1, 2007
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I've done something like this before with computer fans. I ran 2 fans
off 12 volts, then had a DPDT switch to flip them between series and
parallel, giving me either 12 or 6 volts per fan. works very nicely.
but yes, as someone else said, "break before make" or it will dead
short the batteries every time you flip the switch. if you still need
help with this, I can draw you a quick schematic. just shoot me an email.

--- In Electronics_101@yahoogroups.com, "Rob" <robd@...> wrote:
>
> Been trying to wrap my head around this for a bit but wind up going in
> circles.
> Does anyone know a way to use a single DPDT switch to switch 2
> batteries between series and parallel?
> Thanks
>
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