We consume so much energy in our homes throughout the day. From the moment we wake up and turn off our alarm clock, to the moment we turn the lights out to go to bed, energy is pumping through our household. Homeowners often wonder how solar panels, which only produce electricity when the sun is shining, can provide power even after sunset. The answer is brilliant: energy storage.
There is a lot to understand about solar power batteries and how your batteries connect to your solar panel before you can make any decisions about solar storage in your own home. In this article, we’ll discuss everything you need to know about solar energy storage and make sure you’re ready to pursue the option that’s right for you.
What are solar power batteries?
In the simplest terms, solar power batteries allow you to store energy gathered by your solar panels for later use. They’re added to your solar power system, storing excess solar power. Without this kind of storage implemented, any extra energy your solar panels produce goes to the grid.
With storage in place, however, you can use this extra energy when your solar panels aren’t receiving enough sunlight to cover your needs, like at night or on cloudy days. Solar power batteries can also help in power outages. You can see why it’s so common among homeowners with solar panels.
Types of solar power batteries
There are currently two main types of solar power batteries used for residential solar storage. Both of these technologies are unique and come with their own advantages. Let’s dive in.
Lithium-ion batteries:
Lithium-ion batteries are a newer, but definitely the most commonly used, type of energy storage. These are the same batteries used in smartphones and other technology. Simply put, in lithium-ion batteries, energy is stored through a series of chemical reactions. Then, when you need the stored electricity, the battery releases it. This process allows the battery to be charged over and over again, ready for when you need it next.
Lithium-ion batteries are favored for several reasons. Their lifespan averages 10-15 years, providing you with long-lasting peace of mind. The lightweight, compact design fits seamlessly into your space, while their high energy density ensures powerful performance. Tesla Powerwalls, for example, use lithium-ion batteries. Trinity Solar uses this type of battery, and we’re a Tesla Energy Certified Installer.
Lead-acid batteries:
Lead-acid batteries are the oldest type of solar battery. They run the same as most car batteries and have been widely used as in-home energy storage systems for off-grid power options. They’ve been developed alongside clean energy and there have been many improvements to their efficiency. However, lead-acid batteries are decreasing in popularity because of their shorter lifespan and lower efficiency.
What is coupled storage?
Now that you have more information on the batteries involved in solar storage, it’s time to get into coupling. Coupling refers to how your solar panels are wired to your battery storage system.
Homes and buildings use alternating current, or AC power. However, batteries must be charged with direct current, or DC power, which is what solar panels produce. So, how your energy storage is coupled with your solar panels will depend on where your inverter is in the setup and how many times your energy is converted.
Types of coupled storage
The two types of coupled storage, DC or AC, will impact your solar energy efficiency and usability. Let’s take a look.
DC-coupled batteries:
With DC-coupled batteries, your solar panels and battery will produce DC power and convert it one time into AC power to be used in your home. With just one conversion, you’ll have a more efficient power system. It can also be cheaper to install alongside a new solar system because there’s no need for any additional conversions.
AC-coupled batteries:
AC-coupled batteries, on the other hand, go through a slightly more complex process. Your solar panels will produce DC power and, from there, the energy will convert into AC power. It’s then either used immediately in your home, or it can be converted back to DC and stored in a solar battery. When it’s time for the stored DC power to be used, it’ll convert into AC power once again. While the three transformations result in energy loss, making them slightly less efficient, DC-coupled batteries are still a great storage option.
What are the benefits of solar battery storage?
Now you have the key information you need about solar battery storage. But you may still be wondering: what are the benefits of solar batteries? There are many benefits to integrating battery storage with your solar energy system.
- Maximize efficiency: Battery storage allows you to maximize the use of your solar power. By storing energy, you get more out of your solar panels and lower your reliance on the grid.
- Lower electricity costs: Because you’re not so reliant on the grid and able to use your solar power even when the sun isn’t shining, your electricity costs could go down.
- Reliable emergency resource: Solar battery storage provides a reliable backup power source for power outages. No need to worry about losing power in emergencies.
- Reduce carbon footprint: By storing excess solar energy, you can reduce your carbon footprint and contribute to a cleaner, more sustainable energy future.
A quick recap: navigating solar power batteries
Solar battery storage allows homeowners to store excess energy generated during the day for use at night or during outages, increasing energy independence and efficiency. The two main battery types are lithium-ion, which is long-lasting and efficient, and lead-acid, which is less durable.
Depending on the type of battery, storage systems can be DC-coupled or AC-coupled. Beyond cost savings, battery storage provides backup power, reduces reliance on the grid, and supports a cleaner environment. Investing in solar storage enhances sustainability and maximizes the benefits of solar energy, making it a smart choice for a greener future.
Is solar power storage right for your home?
If you want to reduce electricity bills, increase energy security, and maximize your solar investment, battery storage is a great option. Whether you’re installing a new solar system or upgrading an existing one, solar storage can help you take control of your energy future.
Schedule your free consultation with one of our Solar and Battery Experts to learn more.
