Crazy is a very relative term.
So let's go with reasonable.
Where do you live. This is what drives the answer.
Visit PV Watts http://pvwatts.nrel.gov/
Plug-in the numbers you know, experiment with the direction, south and/or west will give you the best results, and see what you get.
Below is my experience.
- I am in Maryland, and just hit a total of 2 Mega Watts from my PV system today.
My system is only 8 months old, so I have not seen summer numbers yet.
For incentives, there is the 30% Federal Thing that comes off the bottom line, that can drop the 'true' cost by 40%. This rebate covers everything needed to produce solar power.
This required replacing my panel, a Federal Pacific that I would have done in the next year anyway. So anything I saved there was free money.
I paid for the transfer switch,its interconnection, power inlet, and so on, but since the heavy-up was happening, it was a modest add on, and I now have a full 200 amp switch, permit pulled and county inspected.
Maryland makes zoning a non-issue, the purchase is tax free, and they gave me a one-time $1,000 for installing renewable energy.
The County gives me a one time - one year, property tax credit, up to $2,500. The solar system also can not be used to raise the value of my house.
The Maryland PSC requires the local power utility to buy my excess production back at retail cost.
Maryland also has a meet 2% of electric production using solar by 2021 program. This is currently done with 'Solar Renewable Energy Credits,' bought by power producers on an open market. However currently for small retail customers there is a floor value in Maryland created by the PSC.
For power produced in 2015 and 16 the value is $350 MW, it will continue to drop every 2 years. The open market value is currently about $100. For small generators the credits are based on the calculation by PV Watts - http://pvwatts.nrel.gov/ instead of power generated at the meter. Sometimes this is good, sometimes bad - but it is constant, and that is nice.
At 10 KW peak, or less, the local electric has a streamlined process for connecting to the grid, and PJM, the local grid operator also makes it fairly painless.
10 KW is a tipping point, anything over that and the regulations for grid-tie become less than easy.
The grade of your yard heading to the east is not a problem, your panels can point any way you wish.
Racking is a surprising portion of the install cost. Mine cost about 75% of the panel price. Mine are also mounted on the roof.
If you are looking at putting them in you yard, the savings mount quickly. Lower is less expensive, and can easily become a do it yourself project. A segment between 2 uprights, or 1 edge on the ground, are very do-able.
The only place on the install where you will need a licensed electrician is to tie into the house/grid wiring.
My payback is currently looking at about 7 years, less if the price of electricity increases. Next increase is slated for May, payback will be coming more quickly.