Solar battery storage is the only way to use your solar electricity when the sun is not currently shining. With a solar battery you can store any excess electricity generated by your solar panels in the daylight hours, and then use this electricity when you need it. By combining solar panels with an effective battery storage system, you will be able to make better use of the energy you generate, reduce reliance on the grid, and increase control over your household or business electricity use. But how does solar battery storage work? And how can a solar battery improve your solar energy system?
How do solar panels generate electricity?
Your solar panels produce electricity when sunlight hits the photovoltaic (PV) cells on their surface. These cells convert sunlight into direct current (DC) electricity. Most homes and businesses, however, use alternating current (AC) electricity. This means the DC electricity produced by your panels must first pass through an inverter, which converts it into usable AC power.
At this point, the electricity generated by your solar panels is ready to power your property. Any energy you do not immediately use becomes excess electricity.
What happens to excess solar energy?
Without a battery, excess solar electricity is typically exported to the national grid. While you may receive a payment for this through an export tariff, the rate is usually lower than the cost of buying electricity back from the grid later.
A solar battery changes this process. Instead of exporting all unused electricity, your system diverts surplus energy into the battery. This stored energy can then be used when your solar panels are producing little or no electricity, such as in the evening, overnight, or during cloudy weather. This can help you save money on energy costs.
How do solar batteries store energy?
Most modern solar batteries use lithium-ion technology, similar to that found in electric vehicles and portable electronics. When excess electricity flows into the battery, it is stored as chemical energy through an electrochemical process. The battery remains on standby until your system detects a need for additional power.
When your property requires electricity and your solar panels are not producing enough, the battery discharges. During discharge, the stored chemical energy is converted back into electrical energy and supplied to your home or business.
This process happens automatically. You do not need to manually control when the battery charges or discharges, as the system is managed by built-in software and energy management systems.
So what is the role of the inverter and control systems?
The inverter plays a central role in solar battery storage. In some systems, a single hybrid inverter manages both the solar panels and the battery. In others, the battery has its own dedicated inverter.
The inverter and control software continuously monitor how much electricity your solar panels are generating, how much energy your property is using, and the battery’s current charge level. Based on this information, the system decides whether to send electricity directly to your property, store it in the battery, or import power from the grid if required.
You may also have access to a monitoring app or online portal. This allows you to see, in real time or through historical data, how much energy you generate, store, and consume.
Using stored energy in practice
Once your battery is charged, it can supply electricity whenever demand exceeds solar generation. For example, in the evening, your battery can power lighting, appliances, and electronics without drawing electricity from the grid.
Some systems allow you to prioritise battery usage during peak electricity price periods. If you are on a time-of-use tariff, your battery can discharge when grid electricity is most expensive and recharge when prices are lower or when solar generation is high.
In certain setups, solar batteries can also provide backup power during grid outages. If this feature is included, your system can isolate your property from the grid and continue supplying selected circuits with stored energy. Not all batteries offer this capability as standard, so it is important to check system specifications.
Battery capacity and performance
Solar battery capacity is measured in kilowatt-hours (kWh). This indicates how much energy the battery can store. The right capacity for you depends on your energy usage patterns, the size of your solar array, and your goals, such as reducing grid imports or increasing resilience.
Performance is also influenced by factors such as depth of discharge, efficiency, and cycle life.
Modern batteries are designed to operate efficiently for many years, with warranties often covering 10 years or more.
Integration with the wider energy system
Solar battery storage is increasingly becoming part of a smarter, more flexible energy system.
Some batteries can integrate with smart meters, dynamic tariffs, and future grid services. In time, this may allow you to support grid stability or participate in energy trading schemes.
By storing solar energy locally, you also reduce pressure on the grid and make better use of renewable generation. This contributes to lower carbon emissions and a more resilient energy infrastructure.
So how does solar battery storage work?
Solar battery storage works by capturing excess solar electricity, storing it efficiently, and releasing it when you need it most. For you, this means greater control over your energy use, improved value from your solar panels, and increased protection against rising electricity costs.
For more information or advice, why not contact the experts today, here at the Eco Renewables Group? We work across the UK, from Clitheroe to Cambridge, to deliver high quality solar power solutions.
