Yes, the grid-as-storage concept is what I was refrring to...no batteries required Solar systems that are just going to charge batteries can be a lot simpler, as you only need to condition the DC from the panels to make it suitable for battery charging (assuming a seperate inverter, or DC powered equipment only)
The next step is grid-isolated AC, whcih again can be quite simple as you are not trying to make an exact replica of the AC mains, just close enough and there is a lot of margin in that.
Much harder than either of these is grid connected inverters, but it has the advantage of not requiring battery storage, and having no practical limit to the amount you can generate (unlike batteries where any excess you are able to produce once the batteries are full is wasted)
The next step is grid-isolated AC, whcih again can be quite simple as you are not trying to make an exact replica of the AC mains, just close enough and there is a lot of margin in that.
Much harder than either of these is grid connected inverters, but it has the advantage of not requiring battery storage, and having no practical limit to the amount you can generate (unlike batteries where any excess you are able to produce once the batteries are full is wasted)