Our electric bills run $600 in the summer and $400 winter. A/c and small grow are the big electric users. Looking at Canadian Solar 330w panels for around $220. A pallet of 26 panels can be had for around $4300. Four more panels take it to a 10kw system. I am planning on doing the ground mount installation and hiring an electrician for the grid tie hook up. Initial numbers look like this can be completed under $10k with the tax breaks and we would have a good part of the money back in the first two years.