What is a Solar Battery? Here’s What You Need to Know

What is a Solar Battery? Here's What You Need to Know

This guide is going to help you decide if you need a solar battery system to accompany your solar array and if you do, what type.

By ensuring that you have dependable access to power, saving tens of thousands of dollars a year on utility bills, gaining energy independence, and leading a sustainable lifestyle, adding battery storage to your solar installation can be a great way to enhance your quality of life at home or on the go. Choosing a solar storage option involves a lot of thought, just like choosing any other aspect of solar installations.

With the help of our guide to solar batteries, you can choose the best option to suit the requirements of your building or household and get the answers to your questions about solar batteries.

What Are Solar Batteries, and How Do They Work?

Without somewhere to send energy produced by your solar panels, solar would be fairly inefficient—your appliances would only work when the sun is shining and your panels are working. You wouldn’t be able to use the energy at night if you didn’t use it, and it would be wasted. See How Do Solar Batteries Work?

There are solar batteries, which you can use to store energy that your panels produce and use later on when you really need it. Solar batteries can help you partially protect your home or facility from power outages or even completely take it off the grid as an alternative (or addition) to feeding energy back to the grid.

What is a Solar Battery? Here's What You Need to Know

What Are the Benefits of Using a Solar Battery?

  • First of all, you get the most out of the solar energy generated by your solar rooftop system, thanks to solar batteries. Wasting the extra energy would definitely go against your initial motivation, which was to preserve the environment and make wise use of your resources, wouldn’t it?

In case you are interested, read more about the environmental benefits of solar energy.

  • If your rooftop solar system and battery are large enough, you can run your home mostly on solar power.
  • Using electricity from your battery can be cheaper per kilowatt-hour than using electricity from the utility grid. This depends on the time of day and electricity tariffs in your area.
  • Solar storage also eliminates the risk of electricity prices going up and feed-in-tariffs going down.
  • Last but not least, solar batteries can help ease variations in the solar energy flows (the changes in the amount of sunlight that shines onto photovoltaic (Solar photovoltaic (PV) panels or CSP systems are two examples.)

Solar Battery Types

Lead-acid, lithium-ion, nickel-cadmium, and flow batteries are the four main battery types used in the solar energy industry.


Lead-acid batteries have been in use for decades and are one of the most common types of battery used in automotive and industrial applications. They have a low energy density, which means they can’t hold a lot of energy per kilogram of weight, but they are still affordable and dependable, so they are frequently used in home solar systems.

Depending on the intended use and safe depth of discharge (DOD), lead-acid batteries can be either shallow cycle or deep cycle and come in both flooded and sealed varieties. Lead-acid batteries continue to be a good option for many homeowners thanks to recent technological advancements that have increased their lifespan.

What is a Solar Battery? Here's What You Need to Know


When compared to other battery types, lithium-ion batteries have much more recent technology. Due to their high energy density, lithium-ion batteries provide a more compact, lightweight, and effective alternative. They are excellent for use in laptops, phones, and your home because they enable users to access more of the battery’s stored energy before needing to recharge.

The major drawback of lithium-ion batteries is the significantly higher cost to the consumer. Lithium-ion batteries could also catch fire if installed incorrectly because of a phenomenon known as thermal runaway.


Due to their exceptional durability and unique capacity to operate in extreme temperatures, nickel-cadmium batteries are primarily used in industrial and airline applications rather than in homes. Additionally, when compared to other battery types, nickel-cadmium batteries require comparatively little maintenance.

Unfortunately, because it is such a highly toxic substance, cadmium, if not properly disposed of, can have a seriously detrimental effect on the environment.


Chemical reactions are what power flow batteries. Electrolyte-containing liquid flows between two chambers of the battery to produce energy. Though flow batteries offer high efficiency, with a depth of discharge of 100%, they have a low energy density, meaning the tanks containing the electrolyte liquid must be quite large in order to store a significant amount of energy.

Because of their size, they are an expensive and unusable choice for most household uses. Larger spaces and applications are much better suited for flow batteries.

What to Consider When Selecting a Solar Storage Solution?

What is a Solar Battery? Here's What You Need to Know

There are three main options to take into account when looking for solar power battery storage for your solar installation: flooded lead acid, sealed lead acid, and lithium batteries. You can select the option that is best for you by weighing its price, capacity, voltage, and cycle life.

  • Price: Batteries range in price from about $100 for the least expensive lead acid battery to more than $1,500 for a lithium ion battery. Don’t just think about the immediate costs; take into account the total lifetime.
  • Capacity: In order to determine how much energy you can store, solar panel battery capacity is crucial. More batteries are required to carry a heavier load if you need to run some appliances for extended periods of time.
  • Voltage: Make sure to check the battery bank’s voltage to make sure it works with your panels and the rest of the system, especially your solar panels. Panels typically come in either 12V or 24V options.
  • Cycle Life: According to this, a battery can be discharged and recharged a certain number of times before its capacity falls below its rated capacity.

How Much Energy Storage Do You Need?

The energy that is gathered from your solar panels is stored in solar batteries. Your battery’s capacity determines how much solar energy it can store. In order to use batteries as part of your solar installation, you need solar panels, a charge controller, and an inverter.

To build a powerful and effective system, it is essential to size your battery bank correctly. You might not be able to completely meet your energy needs if your battery bank is too small. Your solar panels might not be able to fully recharge the batteries if your battery bank is too large, which could result in chronic undercharging, shortened battery life, and subpar performance.

Deep cycle batteries have a maximum discharge rate of 80%, but the majority of manufacturers advise against going below 45%. Regularly exceeding that limit will reduce the solar power battery’s lifespan.

Solar Battery Costs

What is a Solar Battery? Here's What You Need to Know

Depending on the style and size of the battery selected, a solar battery or battery system will cost a certain amount. In general, lead-acid batteries cost less to purchase than lithium-ion batteries but depending on how the batteries are used, buying a lithium-ion battery could result in long-term financial savings.

A single lead-acid battery can cost between $200 and $800 or even more depending on the size/power of the battery. Multiple lead-acid batteries may be needed to keep a household powered completely. The average cost of a residential lithium-ion solar battery system with installation falls in the $7,000 to $14,000 range.

Depending on the size and scope of the installation, nickel-cadmium, and flow battery costs can vary significantly. Due to their price, size, stability in extreme temperatures, durability, and disposal requirements, these batteries are less frequently used in residential settings and are more appropriate for commercial and industrial settings.

Conclusion: What is the Solar Battery?

Solar batteries are an expensive upfront investment, but they can ultimately help you save money on energy costs after sunset or in an emergency. They might be essential elements of your energy system if you live off the grid.

In general, solar batteries are regarded as being quite secure. To be approved for installation in residences and establishments, solar batteries must all adhere to a set of safety standards. Make sure the solar battery you intend to purchase complies with all of these requirements as a result.


What is the Difference Between a Solar Battery and a Normal Battery?

Three main parts make up a solar battery: a lithium base, two electrodes, and titanium mesh. Additionally, the positive grid spine is a bit thicker on these. The grid spine of a typical battery is thinner, and lead-acid interaction is typically used when it operates.

How Long Does a Solar Battery Last?

Home solar battery units last anywhere between 5 and 15 years. The lifespan of your solar power system is 20 to 30 years, so if you choose to install a solar battery today, you’ll almost certainly need to replace it later.

Why Solar Battery is Expensive?

Due to the materials used in them, solar batteries are typically pricy. The materials needed to make the electrodes that store and release energy are quite expensive.

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