I have been adding panels and inverters to my solar setup for years now. It's a pretty low budget setup. That's why I have many smaller grid tie inverters versus one larger one. Usually I buy a few panels at a time and wire them up.

Everything was purchased with the ROI from a couple dozen ztex and other fpga boards that I ran years ago, including current mining gear.

The pictures of my power sipping fpga and early asic setups are somewhere in this thread