No problems with HOA whatsoever. They are actually pretty supportive on solar. The system that's on my house is guaranteed to produce a bit more than 12,000 KWh first year then they estimate that production would decrease by about 0.5% each year after that. I went with a 20year lease option as I didn't have cash to pay for it right away, even with all the rebates it would have cost me more than 10k. If I remember correctly the best ROI would be to buy the system outright and collect all rebates. Lease option is still better than buying electricity from Excel.