How many square feet (or meters) are air conditioned? And you mentioned average daily purchases from the grid, but do you know what the maximum is?
In the US, I think the "pinch point" for off-grid systems is usually in the winter for an all-electric home. Shorter days and more likely to have multiple fully cloudy days in a row, at least for a lot of the US.
Just under 100m2 are air conditioned. Largest day on record was importing 23 kWh due to almost no sun, and me choosing to spend the day bulk cooking/catching up on washing. In a grid down/no sun situation I wouldn’t be doing bulk cooking and washing.
In the US, I think the "pinch point" for off-grid systems is usually in the winter for an all-electric home. Shorter days and more likely to have multiple fully cloudy days in a row, at least for a lot of the US.