Now I get to use basic math to determine if this theory is true. Before we start, let us outline the theory.
Statement "putting 2000 square feet of photovoltaic panels will provide more than enough energy for the typical American home and additional fuel for the family hydrogen-electric car"
To start off with, we need to know how much power the typical American home uses. According to the Department of Energy report from 2001, the average American home uses 10,656 kWh a year. Divide by 365 days, gives us: 29 kWh per day. I would bet this number is low since it is 6 years old, but I will keep it.
Now, we need to know roughly how much power a Hydrogen-Electric Car would require to go roughly 100 miles. We have no exact answers because EV info is sketchy at best given the lack of models on sale. In checking Phoenix Motorcars, and RAV4 EV, and a few other sources, I can wager 35 kWh at least are needed. GMs EV1 and the Phoenix required 6 hours on a 6.6 kWh charger. That's about 40 kWh, so I'm being nice at 35 kWh. Plus, it would require more power than this to make enough hydrogen to make 35 kWh. So this is more than fair. If you have any questions about that, ask and I will explain.
So our required energy each day is
29 kWh (home)
35 kWh (car)
64 kWh Total which is still less than the 605 kWh Al Gore burns through a day.
Now, let's see what kits we can use. You said 2000 square feet of solar panels would be enough, but that you had 3500 square feet on your home. So I'll look up both.
The Evergreen Solar 115 Watt Solar Panel is 134 sq/ft, limiting you to 14 panels with 2000 sq/ft available. The best package I could find was a 12 panel setup.
With more space, I spec'd out a Sharp 175 Watt panel, requires 168 sq/ft.
At 3500 sq/ft you could fit 20. The nearest package was in fact 20 panels.
The 12 panel setup is rated at 1380 Watts.
The 20 Panel setup is rated at 3500 Watts.
Now if you didn't know, solar panels never get how much power they are rated at. That rating is under ideal conditions that exist in the factory, which never happens in the real world. For more information, read http://rredc.nrel.gov/solar/codes_algs/PVWATTS/version1/system.html#derate
For now, we'll assume 75% efficiency, that your in sunny Las Vegas NV, that your roof is a perfect 36 degrees tilt, and facing straight south. If any of these are not true, you will get less power from your panels.
The 12 panel 1380 watt system will net you... 2,296 kWh a year!
That is 6.29 kWh a day...
The 20 panel 3500 watt system will net you... 5,822 kWh a year!
That is 15.95 kWh a day...
Recap... we need 64 kWh a day...
We are getting 6 or 16 kWh a day...
By the way... the 3500 watt system is $23,169, and the 1380 watt system is only $10,704.
Bottom line, not only will 2000 sq/ft of solar panels not work, but 3500 sq/ft of panels will barely cover *half* of only your homes daily power usage, without a car that requires power to run.
And while I'm at it... according to http://www.solarhome.org/ I would need a 12,667 watt system to cover the power requirements. That is sixty one, 200 watt panels. 61 panels at 210 sq/ft per unit, would need 12,810 sq/ft... How much roof space do you have? FYI, it would cost you $58,225 for the panels alone, no kit, and wire it up yourself.
Side note: Oil is a source of energy. Hydrogen is not. Example, you can use oil to power the pump to draw out the oil. You can use oil to run the refinery. You can use oil to explore for more oil. The amount of oil used to run all this, is a fraction of what is gained from it. This is because oil, in and of itself, is a source of energy. Is hydrogen? If we found pure sources of hydrogen, yes. But do you see any hydrogen wells or mines? No. Because hydrogen must be created. You would need a source of energy, like oil, to run the machine making the hydrogen. Even once the hydrogen is made, you can't use it to make more. Well you can, but you would end up with less hydrogen than you used to make it.