One key question when thinking about investing in solar panels is: What happens to excess solar energy? Fortunately, there are effective ways to store surplus energy, ensuring you can use it even when the sun isn’t shining.
In this blog, we’ll explore the best options for storing excess solar energy and maximising your solar PV system’s efficiency.
Why Store Excess Solar Energy?
During peak sunlight hours, your solar panels may generate more electricity than you use. Instead of sending this surplus energy back to the grid, storing it allows you to use it later—such as during nighttime or cloudy days. This reduces reliance on the grid, lowers energy bills, and ensures a more consistent power supply.
Best Methods to Store Excess Solar Energy
1. Battery Storage Systems
Battery storage is the most efficient way to store excess solar energy. A solar battery allows you to store unused electricity generated during the day and use it later when demand is higher.
- Lithium-ion Batteries – The most common choice due to their efficiency, longer lifespan, and faster charging capabilities.
- Lead-acid Batteries – More affordable but bulkier and with a shorter lifespan compared to lithium-ion batteries.
A well-sized battery storage system can help you achieve energy independence and significantly reduce electricity costs.
2. Grid Feed-in (Net Metering)
If you don’t have a battery system, excess solar energy can be sent back to the grid through net metering. This means your energy provider credits you for the electricity you contribute, reducing your electricity bill when you need to draw power from the grid later.
3. Thermal Energy Storage
Excess solar energy can also be stored as heat. Systems like solar water heaters or thermal storage units convert surplus electricity into thermal energy, which can be used for hot water or heating applications.
- Ideal for homes with high heating or hot water demands.
- Reduces the need for gas or electric water heating, saving money.
4. Hydrogen Energy Storage
An emerging technology, hydrogen energy storage converts excess solar energy into hydrogen through electrolysis. The hydrogen can then be stored and later converted back into electricity using a fuel cell. While not yet widely adopted, this technology has great potential for long-term energy storage.
Maximising Solar Energy Storage Efficiency
To make the most of your excess solar energy, consider these strategies:
- Invest in a Battery Management System (BMS): Ensures batteries charge and discharge efficiently.
- Monitor Your Energy Usage: Use smart meters or energy monitoring apps to track consumption and optimize storage.
- Choose the Right Storage Capacity: Oversized or undersized batteries can lead to inefficiencies. Work with a solar expert to determine the right capacity.
- Combine Storage Methods: A mix of battery storage, thermal storage, and grid feed-in can offer a well-rounded solution.
Is Solar Battery Storage Worth It?
The decision to invest in a solar battery depends on several factors:
- Electricity Costs: If energy prices are high, storing excess solar energy can provide significant savings.
- Grid Reliability: If your area experiences frequent power outages, battery storage offers a reliable backup power source.
- Feed-in Tariffs: If your utility company offers low compensation for sending energy back to the grid, self-storage may be more beneficial.
Get Started with Storing Excess Solar Energy
Storing excess solar energy ensures you maximize the benefits of your solar PV system. Whether through battery storage, net metering, thermal storage, or emerging hydrogen technology, the right storage solution depends on your energy needs and budget.
Interested in optimising your solar energy use? Contact SGS Energy today to learn more about the best battery storage solutions for your home or business!
