[bruce511]

Your numbers are likely off by about half (in Germany your sunlight is less than 1200w/m2, panels are more like 22% effecient, you'll gave at least some cloudy days, your panels won't be tracking the sun.)

But a small system is still going to bring a return and is cheap to install. And it'll give you a real way to understand the concept and to experiment.

I started with a 660w small system, and it gave me lots of insight for planning my current system.