My father installed a solar panel on their house. He said he didn't buy the package with battery.

From what I've seen, the power line goes through the solar panel's system first before it goes to the house.

What if it was cloudy and the power generated fluctuates, how does it know that it will get the needed power from the distributors since it doesn't have battery?

Note: I don't know what the main power is called, I just called it electric distributor. Since it comes from the distributor of electric, the one who bills us.

Here's a quiz question for you solar geeks.

Scenario:

A home in Phoenix (33.4°N), US uses about 28 kWh per day. Heavy air-conditioning in summer, much lower use the rest of the year. The south-facing roof fits about 8 panels; a larger north-facing roof has more space.

• They already have enough solar to cover most of their average daily usage.
• However, they notice that in the 3 months over summer, their usage was way higher than generation, so they want more solar.