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PowerWall: Peak, shoulder and off-peak

PowerWall: Peak, shoulder and off-peak

I am having trouble understanding the difference between the Powerwall Advanced setting for peak, off-peak and shoulder.

I understand that the general rule is that power will first be taken from our solar panels, then from the battery if solar is not sufficient, and finally from the grid if solar and the battery do not have sufficient power. Does this rule change based on peak, off-peak and shoulder times set?

Or is it something else that changes, such as when the PowerWall tries to charge itself?