How long do solar batteries last?

The solar battery is a consumable item, just like any other battery. It has a limited lifespan, which is determined by its capacity or Ah rating. 

The Ah rating tells you the battery’s capacity in terms of current. The higher the Ah, the larger the capacity of the battery. 

So, if you are using a battery with a lower Ah rating than the existing one, you may charge it in a shorter time.

What is the life expectancy of a solar battery

Most solar batteries have a lifespan of around 5-15 years. However, this can vary depending on the type of battery and how it is used.

However, even the best solar batteries will eventually need to be replaced. How often this happens will depend on how much electricity your system produces and how much you use. A good rule of thumb is that you can expect to replace your batteries every 5-10 years.

Factors that affect the range of solar battery

Solar battery is a consumable item that needs to be replaced from time to time. You might feel that this doesn’t require any special considerations, but it actually does. It has a limited lifespan depending on the quality and performance of the solar battery. 

Normally our solar battery loses its 55% capability after 25 years of usage. Apart from this, several other factors can also affect its life expectancy. 

Whether you are buying or replacing your solar batteries, it is important to understand these points to get the best services. Here are some of the critical factors that affect the lifespan of solar battery.

1. Temperature

The optimal temperature of a battery is 68ºF or 20ºC. However, a drop in temperature in 15°F or 8.3º can reduce life expectancy of lead acid battery by 50%. On the other hand, extreme cold temperature ranging from -4ºF or -20ºC may also reduce battery life.

Actually, the chemical reaction that is involved in charging the battery is sensitive to temperature. 

The reaction process will increase when the temperature goes up, causing the battery to charge faster. But when the temperature falls below the recommended threshold, the chemical reaction will slow down, causing the solar battery to charge slowly. 

This happens because the chemical reaction that takes place in the battery for charging is an exothermic reaction.

2. Battery Type

When it comes to solar batteries, there are three main types: lead acid, salt water and lithium ion. Each has its own benefits and drawbacks, so it’s important to understand the difference before choosing one for your home or business.

Lead acid batteries are the most common type of solar battery. They’re also the least expensive, making them a good choice for those on a budget. However, lead acid batteries require more maintenance than other types and can be less efficient in hot weather.

Salt water batteries are a newer technology that is becoming increasingly popular. They’re more expensive than lead acid batteries, but they require less maintenance and are more efficient in hot weather. Salt water batteries also have a longer lifespan than lead acid batteries, making them a good choice for those who want to invest in long-term solar power.

If you are looking for a solar battery with a longer lifespan then lithium ion battery will be a good option.

3. Usage

The lifespan of a solar battery depends on its usage. When you use a solar battery, it undergoes a process called ‘sulfation’. This chemical reaction happens inside the battery to produce sulfate crystals. In simple terms, sulfation is the build-up of lead sulfate crystals inside the battery.

And this will reduce the lifespan of the battery. When you charge the battery, it extracts energy from the crystals and converts it into electrical energy. But, when the battery is fully charged, these crystals are not converted back into energy, but remain as crystals. And these crystals are harmful to the battery, reducing its lifespan. However, there are ways to prevent or reduce sulfation in the solar battery. One way is to use a solar battery that has low self-discharge rate. This means that the battery does not discharge its charge quickly.

To prevent sulfation in battery, you should should charge your battery with a minimum vols of 24V and kept in a temperature of 24º

So, even if you are not using the solar battery, it does not discharge the charge. This helps you to prevent sulfation, as the battery does not remain fully charged for a long time.

4. Maintenance

Some simple maintenance tips can help you to extend the lifespan of your solar battery. The first thing that you can do is to prevent overcharging of the battery. Overcharging can damage your battery, causing it to lose its capacity to store electricity. So, you need to check the time when the battery gets charged and unplug it.

Another thing that you can do is to use a battery voltage regulator. This device will automatically cut off the charging current when the solar battery gets fully charged. 

A solar charge controller is another device that can help you to prevent overcharging of the battery. All these maintenance tips will help you extend your solar battery’s lifespan.

5. Weather & humidity

The weather and humidity around your solar battery can also affect its lifespan. High humidity can cause moisture inside the battery, which can lead to corrosion of the battery and can reduce its lifespan. Similarly, high temperatures can also reduce the solar battery’s lifespan.

So, when the temperature goes up, you need to take necessary precautions to prevent the battery from getting overheated. You can avoid these problems by placing the battery in a cool and dry place, out of direct sunlight. And if you don’t have a suitable place for the battery, you can also cover it with an insulating material, like a blanket.

Final Thought

The lifespan of a solar battery depends on several factors, including temperature, battery type, usage, maintenance, weather, humidity, etc.

So, when buying a solar battery, make sure you choose a high-quality product that lasts longer. You can also extend the lifespan of your existing solar battery by following these tips. Overall, taking care of your solar battery is important to last longer.


A standard battery can hold a charge for 1-5 days

The number of batteries you need for a whole house solar system will vary depending on the size of your system and how much power you are trying to generate. Generally speaking, for 3kw solar system you need 12 batteries connected in parallel & it will last for 1 hour

Solar batteries typically take around four hours to charge from a full battery. For example solar panels of 100w will charge a 12V battery capacity with in 8 hours

Some solar batteries may have a lifespan of 10,000 cycles while others may last up to 100,000 cycles. Lithium ion phosphate batteries last around 7000 cycles