As soon as you understand, what is required to bring a PV-installation safe and reliable, up to code, into live, you will agree that a thoroughly inspection and a well engineered configuration is required to meet your and any other client's expectations.
Basic keys are:
How much electrical power did you consume last year?
Did you ever consider, that saving on electricity might be a good attitude for the next generation? To teach a good attitude, we need to know your numbers of kWh you're consuming last year at least…
How much (unshaded) space is available?
Although shade is good in the summer for your house, in the winter however, you could use some heat to lower your electricity bill isn't it? To receive as much as possible solar radiation, a spot facing south, with a clear opening to the sky from east to west looks ideal. In case there is not an ideal spot, we have to find compromises. With a shadow meter, it is possible to oversee possible obstructions and calculate optimal scenario's.