Well, close. Now this with OUR SYSTEMS ONLY, this is not true of most energy systems. Most are not capable of all this stuff we can do with our system. The wind solar is parallel except you have about 3x more wind power than solar, but their priority is basically the same.
On a sunny windy day, you will have heavy wind and solar concurrently charging and be getting full power.
If it's at night your wind will run with no solar, if there's wind.
On a sunny day with no wind, solar runs fine.
If there's no wind and solar, like a night with no wind. Your battery will carry the loads until it (battery bank) gets to a weak level.
If your battery level gets low, no matter what else is happening, At THAT point, the grid will take over and run the circuit while charging the batteries for a few hours, then it will cut off grid power and let the system stand on its own again.
In our off grid, it's grid supplemented, the grid either runs the circuit while charging batteries, or grid power is idle. This is NOT TWO WAY, that would be a full Grid Tie. In an off-grid No power will go upstream to the grid or main panel, ever. But with our off-grid we can use the grid in times when it's needed to run the circuit and or charge the batteries. This is an innovation of our systems that no-one else has working this way.
>> then what happens if I move ALL circuits to my new grid-supplemented system?
Then, your system is way overloaded causing it to cycle on and off the grid while it quickly drains your batteries and then cycles back to grid. You may actually wind up using more energy than without the system at all. Even in a whole house, grid-tied system that's not the way you set it up. Not me anyway. I'll post some new diagrams that I am working on that put this all pretty clear. Will be a few days, making one for both on and off-grid.
The whole idea is a carefully tailored load(s) that runs all your GREEN POWER completely and rarely cuts into grid at all. That is optimal. Then, a battery bank that is right sized to carry the peaks and valleys of the charging capacity. So, larger systems will go with 12 batteries, not 8.
Whether Grid-Tie or Off-Grid, with backed up loads, you run a subpanel that is segregated, with loads that are appropriate to the green charge capacity. Thus when there is NO GRID, like a black-out, you have a segregated system running your most critical needs. This not just a circuit, it's a complete system in itself.
If you have a larger system truly capable of running the whole house, designed to do that, I would be configuring it as a grid-tie. Unless you have no grid at all. Since our grid tied system can do all the emergency backup power also, I configure all the larger systems as grid-tie. If you have a big system, what if you go out of town? Might as well have that meter running backwards while you are out of town banking some $ for the power it's making.