Cliff
To get a proper 8kw solar system you will be paying more than the cost of the generator installed.
Been doing lots of research as I'm going to be installing a smaller system to run my cabin with a generator backup to help recharge my battery bank during the darkness of winter here.
You can do a grid tied system which will pay you back $$$$ for power sold to the hydro company but you will need a transfer switch, battery bank, solar controller etc.......
For a proper system for your home you will be looking at double or triple the cost of the generator plus you have maintenance that you must perform on the batteries to keep them healthy.
Go with the generator if you only need it for backup power.