DC plugs and outlets [RE-wrenches]

[Jay Peltz, Peltz Power]

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Hi Kurt,

Thanks.  

jay

 
> Hey Jay,
> 
> I don't have situations or loads that "require" two voltages at a single
> outlet, but while thinking about using a DC plug such as the 15 amp
> 240vac I got to wondering why not.  I have various DC applications,
> usually in smaller systems.  At one cabin it may be 12 volt and at
> another home down the road it may be a 24 volt system.  I also have some
> 24 volt systems where the home owner wants 12VDC and therefore may have
> both voltages.
> 
> I of course don't want 120vac cords plugged into a DC outlet but would
> also not want a 12 volt appliance plugged into a 24 volt outlet.  The
> 15A, 240vac outlet/plug has two horizontal current carrying prongs and
> the standard ground pin as well.  You can't plug 120vac into it and so I
> suggested calling (for instance) the right horizontal pin 12V+ and the
> grounding pin the negative.  In the instance where 24VDC is required,
> the left and ground would be utilized.  I further stated that a 10/3
> wire could even give both voltages at such an outlet.
> 
> While there is a greater need for 12VDC outlets in smaller PV systems, I
> do have systems that are 24VDC but there are some LED night-lites,
> perhaps a circulating fan, or more frequently an outlet for a small
> clock radio, an answering machine, or a place to plug in a cell phone.
> 
> With a 24 volt outlet and perhaps an answering machine or small clock
> radio, these appliances are often 9.5 volt.  I bolt the tab of a small
> 1A voltage regulator (with negative tab) on to the ground/negative
> connection inside the plug and wire the 11-35 V-in of the regulator to
> the 24V+ of the plug and the 9.5V+ output of the regulator to the cord
> going to the 9.5V load.  This all takes place inside the bake-lite plug
> and is very clean.  You can even get a small fuse in there to protect
> the smaller appliance line, but in my tests if you short circuit the
> cord or coaxial power plug at the appliance and there is no fuse, the $2
> voltage regulator fails open and current flow stops.
> 
> Kurt Nelson
>

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