A solar panel is a device that converts sunlight into electricity. It does this using photovoltaic (PV) cells which are made of materials that produce a flow of electrons when exposed to light. This flow of electrons creates an electrical current, typically direct current (DC), which can be used to power devices

You use electricity from your solar panel at day time and use your electric company again. So you will have solar system loan payment and smaller electric company bill.

You can check your electricity bill for daily usages to decide how many solar panels that you need.

A solar panel and backup battery system allows you to store energy generated by your solar panels for later use, particularly during power outages or when solar production is low. This system typically includes solar panels, an inverter, and a battery storage unit. The solar panels capture sunlight and convert it into electricity, which can be used immediately, stored in the battery, or fed back into the grid. When the grid goes down, the battery backup system automatically kicks in, providing power to your home. 

You use electricity from your solar panel at day time and use your backup battery for night time. If you have enough battery size for daily usages, you will have very low electric company bill.

You can check your electricity bill for daily usages to decide how many solar panels and batteries you need.