So if you have no storage on your solar system you would be buying back from the utility on dark days or each night? Selling it back works on a wind farm or vast solar array but doesn't seem to me for home use it could pay back well.
Just because you don't store it doesn't mean it don't benefit you. If you make 1000 kwh one month and only use 700 of them, you have a credit of 300 kwh that you can use on a month where you may not make as much as you used.
Most power companies will not give you any cash reward for your excess electric. They will simply credit your account for the extra you produce at times, so the whole goal of solar in my opinion for me is to just try to size the system as close to what I need as possible. If I'm a littl short one month, great, if I'm a little over one month, it's taken care of.
I have no desire to make more than I could use, hopefully I get a deal that makes this feasible but for example a solar system that would produce enough electric to pay me $350-400/mo retails for $60k before installation. But why get more than you need? There not going to buy it.. If I can I can size properly and trade kwh directly, to me that makes batteries an expense that's not needed at all. A very expensive expense