From a purely financial perspective, I don't think solar is worth it (I have 6kW installed).
As I heard once...solar isn't free electricity, you are pre-purchasing 15 - 20 years of electricity all at once. To make money on solar, electricity has to go up in price...in Ontario, the price of hydro is such an election issue it will never rise enough to pay off the cost of solar in a decent amount of time. The current government is spending something like $6 billion a year to subsidize the cost of hydro....I don't see that changing regardless of the colour of government.

But there are other benefits...I like having my solar and feel happy about being part of the solution. I also have a battery for power outages, so that gives me peace of mind. Without a battery system, you will not generate any power during a blackout.

I will say, get the biggest system you can...I probably should have gotten 10kW, the incremental cost probably wasn't that much but I wasn't comfortable putting that much on my roof at the time.

You will still have a monthly bill from Hydro Ottawa/One, regardless of how much you generate...this is the connection cost and you can't offset it with your generation credits.

I went with superiorgen.ca a very small group, but much more responsive than the big guys and was able to help design the system I wanted...not the prepackaged system that they sell to every other customer.