Scaling an Operation for Going Solar

[Shannon McKenna]

I'm assisting an investor who wants to put solar panels on all of her rental properties and her own home. Right now, she's at four single families total, but she plans to acquire more.

We are currently discussing strategies. I am thinking that instead of paying full cost for parts and instillation on each home, she buy a bulk of panels wholesale and pay to have them installed as she buys (this also helps her take full advantage of the tax credit). 

Does anyone have any experience buying/installing/using solar panels for their properties?  Anything you wish you knew before you did it?