Solar batteries store energy that can be used at night or during a power outage some batteries have an option for emergency circuits to remain powered. They can also provide backup power when the grid is overloaded and the price of electricity is high. Solar batteries are usually paired with a solar panel system, but they can also be used with the grid to buy electricity at cheaper times to use during the day. There are many types of solar batteries, and choosing the right one depends on several factors.

A battery is a device that stores energy and makes it available on demand. The amount of energy a battery can store is measured in kilowatt-hours (KWh). But the usable capacity of a battery also depends on how quickly the energy can be delivered.