Does your power utility do net metering?
How much do you expect to generate compared to your usage on a annual basis?
I got a 6.5kW system a few years ago for a final price of around 12k after rebates. It covers nearby all of my usage and my provider does net metering, so really good days cover less good days, summer covers winter, etc.
I put some hours into it a few months ago and had a good time, but one of the things that I hope they add is better conditions for routes. Maybe I was missing something, but I was having a hard time getting my workers to actually get in the trains I wanted them to.
Are there no free adventures for it online? Surely someone has released something in the system for free?