Solar battery will store the excess energy that’s produced by your solar panels during the day so that you can use it at night. This can save you money on your energy bills, as it’s much more cost-effective than just selling the energy back to your retailer at a cheap feed in tariff.
Save your pockets!
Without a battery you still need to buy a lot of grid power at night, which costs much more than using your battery electricity. Additionally, if you are going to change to an electric car, your battery will definitely save you a lot more money.