Solar battery storage units store electricity generated by your solar panels to use in the future, even when the sun is not shining.

1. Solar Battery Storage: Benefits And How It Works
What Is Solar Battery Storage?
Solar battery storage units store electricity generated by your solar panels to use in
the future, even when the sun is not shining.
The battery storage UK has become the future for power backup for homes and
industries. More and more electricity consumers are turning to battery storage and
solar panel to reduce their bills. The batteries allow buildings/structures with the
solar panels to store energy during the day and use the energy during the night.
These same battery storage batteries could be used for electric vehicles. These
batteries don't take too much time to charge. For example, a 12v, 150 Ah battery,
in a 12v, 25-Watt panel, takes just about 72 hours. The latest solar battery
storage UK come with an average backup for 8 to 9 years depending upon their
DOD (Depth of Discharge) and the conditions of use.
 Storage
They automatically store excess energy created by your solar system which you can
use later on when the sun isn’t shining.
 Back Up
In case the power goes out, users can stay in control by keeping select appliances
running with the adding of backup power.

2.  Charge
The solar system will charge your battery, and the battery will discharge any stored
energy to power your office building and home when it is required.
Know How Solar Batteries Work
As your solar panels convert the rays of Sun into UK Energy Storage, the battery
will store the energy to use at a later time. Your home uses the stored energy and
the excess is sent off to the grid. Later the battery seizes this energy and stores it
for the future use, so you can use it when the sun isn’t shining or when your solar
system isn’t making enough to cover your everyday energy needs. Apart from this,
solar batteries can serve as a backup in the event of a power outage. You can use
the stored battery power if the power goes out and keep appliances running.
When we talk about today’s energy storage for home and office, then we’re talking
about the raft of innovative technologies that are exactly designed to make energy
storage easy, and relatively unobtrusive. This includes lithium-ion, saltwater
batteries, and flow batteries.
Source - https://zenobeenergy.blogspot.com/2018/10/solar-battery-storage-benefits-and-how.html