Simple, simple...
Take 47 lbs of lead acid batteries, configured for what ever DC voltage
you want.
Connect this in series with the AC lead. Hide in wall. Do not touch.
Can also use any usual DC power supply with floating output. (I don't
think you can buy a power supply that does NOT float except perhaps some
wall warts.) The PS current rating must be high enough to take the sum
of both DC and AC -serious capacitance may have to be added to ensure this.
If we are still talking 3 phases, gotta do this for each phase. Wow!
Ol' Bab
On 5/27/2013 3:28 PM, Andrew wrote:
You mean an annoyance like the advance of the perihelion of Mercury? :)
OK, once again you furiously misunderstand. The isolation capacitor is
in series between the grid transformer and the wall plug. Behind the
wall plug, downstream of that capacitor, a DC power supply is
connected in a T configuration. It's possible to do this but you can't
just attach a wire. Some circuitry is involved to provide a DC shift
without compromising the AC and without blowing up the DC power supply.
Andrew
