Another idea is to use grid tie inverters without the grid (by making sure the grid is completely disconnected).  To do this, a substitute grid will be needed consisting of a sine-wave ups that can be cold started off of it's battery.  The output of the sine-wave ups will supply the enable to turn on the grid tie inverters that are solar powered.  Since grid tie inverters normally use the load of the grid as a voltage regulator, voltage stabilizers (buck and boost) will help to regulate the voltage output to the load. 

The ups sine-wave inverter will need a sine-wave input to restore power to the ups, so the ups does not continue to run off of battery.  A small sine-wave inverter that is powered from a solar panel or a battery that is powered from a solar charger, could supply a sine-wave input for the ups.  This set-up would not require a battery bank, but would only work during strong sunshine days.  A small generator that provides sine-wave output might also be used as the substitute grid.  This idea is untested to run a home, but I have successfully tested to see if a ups will enable a grid tie inverter.

Anybody else tried this before?

Problem with that is the grid tie inverter is designed to apply a higher voltage so as to "inject" as much power as possible back into the grid while the panels have sunlight, if you connect a 5 kW solar grid tie system to a sine wave UPS it will destroy the UPS by the grid tie inverter applying about 280 volts AC (maybe more or less) to the UPS sine wave output so as to "inject" 5 kW into the UPS. Would be spectacular but destructive I think.

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I think it was Stanley Meyer? who developed a method of running an internal combustion engine on water back in the 1970's but I don't think it's ever been replicated.

I have serious doubts about Stan's claims. Mainly, for he was no engineer, making a lot of mistakes in the theoretical world.
But my main point is, that he never published any measurement data. Well except for one time, in his Technical Papers. And there you will immediately see, that he made wrong assumptions and calculations. And if you calculate everything correctly with the measured data he gave, you get an efficiency of 70%. Which is about the value to expect for a conventional electrolysis.
That's also why I'm not surprised, that the experts in the court case also were not impressed by the device, also stating, that they do not see anything special from a normal electrolysis...

Additionally we have in the meantime an interview of someone close to Stan who was there on the car tests. And he said, that the car would drain the batteries instantly, so that they were down within minutes...
So he basically run it electrically, just by the way of an H2 generation and a combustion engine. Sure also an interesting idea, for a kind of hybrid car design...
So you could either chose to run it electrically or on gaz. But as said, you then need quite some batteries, like electric cars do need them. And the efficiency, when you run it electrically would be really bad...
But yes, it would be an easy system to convert any car, into an electric car, without too much effort...

If I remember correctly, I think the Japanese had a fighter or bomber in WW II that used water injection to increase either performance or range. Mitsubishi maybe?

Water injection into engines (piston, or jet) has been used on and on in history. AFAIR it's main use has been  to cool the inlet air (increase density) and the engine, so that you can increase the power without wrecking the motor. But the cooling also increases efficiency.
In jet engines it has been used for the same, additionally the water exhaust has much more mass than air, so that you get much more thrust.
As said, all this info  is AFAIR.
But you can also look up Wiki, as always: http://en.wikipedia.org/wiki/Water_injection_%28engine%29

is viable  solution with semiconductors used by DAVID WYNN MILLER ?  see detatails

http://www.tubechop.com/watch/4429349