A solar battery is an energy storage device that can store the electricity generated by solar panels for later use. It becomes particularly useful when your solar panels aren't generating power, such as during the night or on cloudy days.

Think of a solar battery as an energy reservoir to tap into when energy generation is no longer happening. For instance, if your solar panels aren't working and the grid is down, you can draw power from the energy stored in your solar battery system to power your devices.

The primary reasons most people opt for solar batteries are fourfold:

1、Emergency Backup: Having a backup power source in case of grid failures.

2、Avoiding Waste: Preventing excess energy generated by solar panels from going to waste due to lack of storage or net metering.

3、Off-Grid Power: Being able to power their devices even when solar panels aren't generating power and there's no other power source available (off-grid living).

4、Cost Savings: Reducing energy costs since solar energy is the cheapest source of energy. The cost per kilowatt-hour of solar energy is more affordable than the cost per kilowatt-hour from the grid.