"lionslair at consolidated dot net" "lionslair at consolidated dot net"
wrote in message ...
Me wrote:
In article ,
"Ulysses" wrote:


"wmbjk" wrote in message
. ..

On Thu, 16 Jun 2005 15:43:10 GMT, "Pete C."
wrote:



Not necessarily. Home welding tends to be short duration. The hardware
to supply that kind of power is actually affordable, and if one is
designing the power system from scratch for what most would consider a
normal home, then the extra inverter capacity isn't a big deal. In our
case, for the house loads alone we could have gotten away with a
single SW4024 plus a transformer for the 220V loads.

How is this done, getting 220V from 110? How do you get the two "hot"
wires? Are there 2 secondary windings on the transformer? Wouldn't
they
need to be out of phase with each other?




Now here is a fellow that asks an inteligent question. If you take
a dual winding secondary with 120 Vac on each winding, feeding it
with a 120 Vac Primary, and connect the dual 120Vac windings in series
you get 240Vac. The phase is determined on how you connect the two
series windings. and they will either be inphase or 180 out of phase,
depending on the connection.

Me
Either 240V give or take a few due to coupling differences or
Zero give or take a few due to coupling differences.

When it is zero the phasing is wrong and must be reversed on one winding.
Many electronic transformers have black dots on the 'true' winding lead
to make phasing easier. Power is just the same simply a single frequency.

Martin

--
Martin Eastburn

Since we are on the subject it occured to me that I have a 120 to 240 V
transformer that I removed from the first house I bought. The
not-real-bright person I bought the house from left it attached and hot with
a male plug sticking out where anyone walking by could run into it. I'll
have to dig it out of it's box-in-the-garage and see if I can make use of
it, now that I have some understanding of how it's supposed to work and be
connected :-)
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