Solar batteries store excess energy generated by your solar panels during the day. This stored energy can be used at night or during power outages.
They are an integral component of a solar power system, storing energy for when the sun isn’t shining. So what are solar batteries and how do they work? This blog aims to answer these questions and more.
What Are Solar Batteries?
Solar batteries are energy storage systems that store surplus energy generated from solar panels. When the sun shines, your solar panels collect radiant energy and convert it into electricity. While some of this electricity is used immediately, any excess production can be stored in solar batteries for later use, such as during the night or overcast days. This capability to store energy elevates the effectiveness of solar power systems and enhances energy independence while creating financial savings on your energy bills.How do Solar Batteries Work with Solar Panels?
A solar power system comprises several components. Firstly, solar panels convert sunlight into direct current (DC) electricity. This is then fed into a solar inverter, which converts the DC electricity to alternating current (AC) to be used by home appliances. A switchboard then directs the AC electricity to where it’s needed. In a standard solar system, the grid kicks in when the sun isn’t shining. Any excess solar energy is fed back to the grid.
In a solar battery system, excess solar energy is directed to charging the battery. The battery inverter converts the electricity into storable energy. This stored energy can then be used at night or when there’s more energy demand than the panels can produce. And if your battery runs out, the grid will provide the additional power you need.
Below is an example of how an AC-coupled battery system works when the sun is shining:
And here’s how the same solar battery system works at night or during power outages:
Do Solar Batteries Work During a Blackout?
Yes, if your solar battery is designed for backup, it can power essential appliances during a blackout. If your battery has blackout protection, it will automatically switch your home to your stored solar energy during an outage.
There are two types of blackout protection:
- Whole-home backup: Powers everything in your house, but drains the battery faster.
- Essential load backup: Prioritises critical circuits like lights and refrigerators, making your battery charge last longer.
Not all batteries have power outage detection. Some have it built-in, while others require an optional backup box, adding to the cost. Check with a solar battery installer whether your system has the right components to use solar power during a blackout.