How Long Do Solar Batteries Last?

According to statistics, seven out of ten people shopping for solar panels are often interested in adding batteries to their systems. This is probably because off-grid systems will still provide power even when there’s a power blackout.

Read this article to learn about solar systems and power outages. We know that energy storage is an important aspect of getting a system, and as a long-term plan, you want to be sure you are making the right decision. Hence, in this article, we’d be answering one of the most common questions people have about solar batteries; how long they last.

We’d also go further to talk about some factors that can affect the lifespan of your battery. This way, you’d know what to do to make it last for as long as it’s meant to.

Life Expectancy of Solar Batteries

Batteries used in home solar systems often last between five to fifteen years. Solar systems often last for about twenty to thirty years. So, if you choose to add a battery to it, then you’d need to replace the battery at least once or twice to meet the system’s lifespan.

Things That Affect Solar Batteries Lifespan

While the battery typically lasts between five to fifteen years, some factors may help to prolong its lifespan. The following are some of these factors:

1. Usage

The battery’s usage cycles typically influence its life expectancy. Fortunately, the majority of these batteries are deep-cycle ones. So, they can discharge about 80 percent of the energy stored before recharging.

While some have to be discharged manually before recharging, you can look out for one that charges automatically; this will prevent overcharging. Not overcharging the battery will make it stay efficient and healthy for a long time.

2. Warranty

Every manufacturer gives a warranty for their products and these warranties are of a very wide range. Most of the time, you can trust the warranty that the product comes with. So, look out for the product’s warranty before you buy.

3. Maintenance

One important lesson you need to take from this battery guide is that your battery needs maintenance. Properly maintaining it will significantly improve the battery’s longevity. Annual maintenance may cost you somewhere between 150 dollars to 300 dollars, whereas repairs often cost between 100 dollars to 3,200 dollars.

When choosing a solar company for the job, look for one that offers you a guarantee. They may also reduce or even eliminate the maintenance cost by monitoring your system (including the battery) remotely.

4. The Battery’s Temperature

Where the battery is stored can make a significant impact on its longevity. These batteries are meant to be stored in an environment with optimal temperature. This maximizes not just their lifespan but their efficiency too.

If the temperature in your area is mild/temperate, then the battery could be kept outdoors. But if the area has harsh temperatures, then your battery has to be installed either in your basement or garage to ensure it works optimally.

5. Type

There are 3 types of solar batteries based on the chemical compounds used to make them: saltwater, lithium-ion, and lead-acid.


Lead acid has been used to make solar batteries for several decades now. They are relatively cheaper; however, their lifespan is also relatively shorter. Their DoD (depth of discharge) is also lower than those made with lithium-ion.


These are the most common solar batteries on the market and this is because they are light, compact, and their lifespan is relatively longer. You can visit to learn more about lithium-ion batteries.


Unlike lithium-ion and lead-acid batteries, saltwater ones do not have heavy metals. Instead, they make use of saltwater electrolytes. So, they can be recycled easily. Due to this, this option is the most eco-friendly option in the market.

But this technology is new and it’s still somewhat untested. Therefore, lithium-ion may still be your best bet when it comes to maximizing your system’s efficiency and the battery’s lifespan.


Including a battery in your solar system can be beneficial in some ways. But because these batteries are built to last between five to fifteen years, you’d have to replace yours at least once to match your system’s lifespan. However, some factors can influence your battery’s life expectancy, and we’ve discussed these factors to help you make a great choice.

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