[AT] [OT] Has anyone seen one of these??

[Doug Tallman]

I have a Kohler 110 DC generating plant. I think it's 1500W. Always 
wondered what I could run with it besides light bulbs.  Doug T

On 12/21/2019 8:10 AM, Stephen Offiler wrote:
> I'll admit I had no idea there was ever much of a DC grid, beyond the 
> earliest of early days when Edison supported DC and Tesla supported AC 
> and electric power was an untamed frontier.
>
> Carl's comment about working with AC vs DC might refer to the workings 
> of the appliance.  Agreed, generally, volts times amps equals watts 
> and it doesn't matter AC vs DC. That is 100% true for resistive loads 
> like lightbulbs.  It is not quite true for inductive loads like 
> motors, but OK as a first-pass approximation.
>
> The major difference with having DC around is safety.  If you get 
> zapped by 120VAC, the reversing polarity means crossing thru 0 volts 
> 120 times per second, which tends to kick you away.  DC does not 
> reverse, and the steady voltage tends to lock up your nervous system 
> and kill you.  Back in the early days, conductor insulation was not 
> exactly up to modern standards, nor was there much in the way of 
> safety watchdogs like Underwriter's Labs etc., so electric shock was 
> more of a threat.
>
> Steve O.
>
>
> On Fri, Dec 20, 2019 at 4:37 PM <szabelski at wildblue.net 
> <mailto:szabelski at wildblue.net>> wrote:
>
>     Working with a 115VDC system would be no different than working
>     with a 120VAC system. You house has a 100A or 200A  service, that
>     doesn’t mean you can draw that current at every wall plug. Your
>     breakers would limit the current and trip if you try to pull more
>     than rated.
>
>     I would guess that a house back in the day of 115VDC had a
>     standard series of four cell fuse blocks with 2, 3, 5, 10, and
>     maybe a couple of 15A fuses. When I was a kid in Detroit, our
>     house had such a set up for our old 80A 120VAC house service (it
>     was mounted on the back porch, outside, but sheltered from the
>     weather.). Fuses were still in use up to the 40’s - 50’s.
>
>     Carl
>     ----- Original Message -----
>     From: szabelski at wildblue.net <mailto:szabelski at wildblue.net>
>     To: Antique Tractor Email Discussion Group
>     <at at lists.antique-tractor.com <mailto:at at lists.antique-tractor.com>>
>     Sent: Fri, 20 Dec 2019 16:05:51 -0500 (EST)
>     Subject: Re: [AT] [OT] Has anyone seen one of these??
>
>     Cecil, this would only be about 5 to 6 amps at 115VDC. If you want
>     it to run, you’ll have to put 10 car batteries in series to get it
>     to do so.
>
>     Putting 10 car batteries in series could give you a potential DC
>     current equal to about the current from the weakest battery.
>
>     Batteries add voltage when in series, and maintain the current
>     rating of one individual battery. Batteries in parallel maintain
>     the voltage level of one individual battery, and the current add
>     together.
>
>     On the Abrams we used a series-parallel combination of six 12V,
>     100 AH, batteries to get a battery system rated at 24 VDC and 300
>     AH. Three sets of 2 batteries in series, connected in parallel.
>
>
>         Carl
>
>
>     ----- Original Message -----
>     From: Cecil Bearden <crbearden at copper.net
>     <mailto:crbearden at copper.net>>
>     To: at at lists.antique-tractor.com <mailto:at at lists.antique-tractor.com>
>     Sent: Fri, 20 Dec 2019 09:42:32 -0500 (EST)
>     Subject: Re: [AT] [OT] Has anyone seen one of these??
>
>     OK, this is old, I have found ads dating back to 1912 showing
>     this.  It
>     is an old shop vacuum.  When it was mounted on casters it was used in
>     the home.  US radiator corp owned the invincible vacuum mfg co.  I
>     don't
>     know if I can use it for cleaning out the tractor cab, the motor
>     states
>     3/4 hp on the nameplate.  It also mentions DC, so I have to
>     inspect when
>     I get it this afternoon. 115 V on D.C would knock you into the next
>     room....   My wife wants to turn it into a table lamp.... I am more
>     of a purist, I want to see it work....
>
>     Cecil
>
>
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