How Long Do Solar Batteries Last?

How Long Do Solar Batteries Last?

Adding a solar power system to your home is becoming a more and more popular option for affordable and green energy.

The challenge many home solar systems face is the fact that they’re still connected to the grid. As a result, you might not have access to power if there is a power outage. Similarly, your solar energy system may not produce enough energy during certain times of the year or weather conditions.

Luckily, new technology has allowed home solar battery units to become more popular. Although the least expensive options are expensive, they should be viewed as a long term investment. So, it’s important to know about the life expectancy of solar batteries and proper care.

In this article, let’s learn about the life expectancy of solar batteries and what you can do to make sure you get the best and longest-lasting solar system.

solar power system

Are Solar Batteries Worth It 2020?

Because solar systems can only produce energy whenever it is sunny out, solar battery storage allows you to save up some of that electricity for a rainy day, quite literally.

Energy storage systems with efficient storage capacity can help transition your grid-connected solar system into fully functional off-grid energy systems.

In other words, you will be able to produce enough energy during the sunlight that you can power your home, rain or shine, thanks to stored energy provided by your fully charged battery. You won’t even need to be connected to the grid.

Are Lithium-Ion Batteries Best For Solar Storage?

The best solar battery today is lithium-ion batteries. This method involves a lightweight metal, which allows the electric current to pass through easily. More so, lithium-ion batteries are rechargeable due to their reversible chemical reactions. This allows them to both absorb and discharge power.

As a whole, lithium-ion batteries can store a lot of energy and keep their juice much longer than other battery types. Although lithium-ion batteries are expensive, there are decreasing in price due to their popularity and functionality.

In the market today, the lithium-ion battery offers the best batteries for solar battery usage. Hence, most solar batteries fall into this category since they are easily recycled and viewed as the gold standard in the industry.

Other Battery Options

Even though the best solar battery system is lithium-ion, there are other battery options. For example, there are lead-acid batteries, hydroelectric storage, and even batteries with unique chemical compositions and the occasional saltwater battery.

Of these many options, lead-acid batteries tend to be the most second popular option. Lead-acid batteries may be a great backup battery option if you are looking for something a bit more affordable than the previously looked at model. The lead-acid battery is a popular home choice as a result.

lead acid batteries

The saltwater battery is another great choice. Even though it is less popular than lead-acid batteries, saltwater batteries can help you retain your energy, even when the sun is not out. Most people choose saltwater batteries, which use saltwater electrolytes because they are affordable.

How Long Energy Storage Systems Last

Now, let’s dig into the real question of this article: what is a solar battery’s lifespan? Of course, the exact duration of your solar battery will depend on the battery type and company you select.

energy storage system

How often do you have to replace solar batteries?

As we learned above, some of the most efficient batteries are made from lithium-ion. As a result, companies that make high-quality batteries typically use these materials. Most companies estimate that their energy storage systems can last about 10 years with 60% storage capacity.

In comparison, affordable options, such as lead-acid batteries, typically have a lower expected lifespan. These batteries often only last between three to five years, making them notably less durable than the more expensive options in the long run.

So, high-quality energy storage systems will be more expensive up front, but they can last at least twice as long as the more affordable options.

How much does it cost to replace solar batteries?

Solar battery installation can cost around $7,000 to $1400. Getting the batteries replaced can cost around $7000 or slightly higher, but they often are more affordable than the first installation.

Other Factors To Look At Other Than the Lifespan Of A Solar Battery

In addition to your solar storage battery lifespan, there are some other factors to look at to ensure new customers spend their money wisely.

Don’t Forget About Health and Functionality.

For example, you want to make sure that the battery stays healthy for longer. However, just because a certain battery may have a technically longer lifespan does not mean it will function and a battery with a shorter lifespan.

Specifically, look at the depth of discharge. Depth of discharge or DoD tells you how much of the battery’s percentage has been discharged compared to the battery’s overall capacity. The depth of discharge is typically expressed in a percentage. The higher the percentage, the better the discharge.

Some of the best solar storage options have a depth of discharge close to 95%, which is the recommended depth for top options. Models with a higher DoD often have great overall efficiency as well.

How To Maintain Your Solar Panels and Storage System

To increase the expectancy of a solar system, there are some things you can do to maintain your battery and keep it working as usual. This applies to deep cycle batteries and any other batteries many new customers may be interested in.

solar panels with storage system

Avoid Sulfation

Sulfation is the top cause of broken solar batteries. You can prevent it by keeping the battery charged and keeping the electrolyte levels ideal. Check the fluid levels inside and check the charge level. If you are unsure how to do these two things, you can talk to an installer or professional to teach you how.

Charge The Batteries

Additionally, make sure to keep the batteries charged. You can try float charging, which means you charge the battery at the same rate it discharges. There are also bulk charging and absorbing charging methods. Make sure to avoid overcharging the batteries while you’re charging them, though.

Clean And Replace Batteries

You can clean your batteries by using a mixture of baking soda and distilled water. Obviously, make sure all the connections are tight and remove any clamps before beginning the cleaning process. If your batteries are old, you may need to replace them entirely.


At the end of the day, you can use a solar battery to maintain your solar power, even if there is less light than usual. Make sure to check the lifespan of your solar battery to ensure you make a good purchase.

Also, look at the type of battery you choose, such as the heavy metals inside it, usage cycles, and kilowatt-hours. Good luck!

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