Best Batteries for Solar Panels: All You Need to Know

Dean Emerick

January 14, 2023

Are you looking to capture clean and sustainable energy with a solar energy system? If so, it's important to understand the critical role batteries will play in introducing renewable energy into your life. While regular batteries derive their energy from chemical reactions, solar batteries are powered by renewable energy taken from sunlight. High-quality and long-lasting batteries are key components of any successful solar panel setup; they provide an added layer of security by storing up all that sunlight your panels harness until you need it. Keep reading to learn all about the best types of batteries for your solar panels and how they should be used properly!

Which type of batteries are best for solar panels?

Solar panel systems are becoming increasingly popular, often being used as a direct power source for homes. Using the right type of battery to store energy generated by these renewable energy systems can be critical to their success. Lead-acid batteries provide reliable and dependable performance, making them a favourite among many who have solar panels. However, they often require a high level of maintenance. Additionally, lithium-ion batteries can be a great choice due to their high efficiency, low maintenance, and increased life span over lead-acid models. Both types of batteries have benefits that make them good choices for powering solar panel systems.

Lead acid batteries come in two types: flooded and sealed. Flooded lead acid batteries require regular maintenance to keep them functioning properly, while sealed lead acid batteries contain enough electrolytes to last their lifetime. On the other hand, lithium iron phosphate (LiFePO4) is commonly used for its higher level of energy storage compared to other types. LiFePO4, also known as lithium ferro phosphate batteries, have a longer cycle life than both sealed and flooded lead acid batteries, as well as higher power density and cycle life.

Is it worth getting a battery with solar panels?

Investing in a battery with solar panels is beneficial because you can utilize the solar energy you’ve produced when the sun isn’t shining, providing clean energy on cloudy days and at night. Batteries can allow you to gain energy independence by providing backup power in the case of a power outage and a large battery system can even allow you to cut ties with your utility provider completely, saving you connection costs. 

How many years does a solar battery last?

A solar battery typically has a life expectancy of 5-15 years, depending on how well it is maintained and used. Battery maintenance plays a key role in extending the lifespan, so regular inspections and upkeep are essential in increasing its longevity.

How many batteries would it take to power a house?

Powering an entire house with batteries is certainly possible, but it does depend on the size of the house and the amount of energy needed to run it. Typically, homes require a large battery backup system, usually composed of multiple solar batteries, in order to store enough energy for long-term use. The exact number of solar batteries depends on the amount of electricity that is consumed, however most systems require between two and eight solar batteries to effectively power a home.

Can I install a solar battery myself?

Yes, you can install a solar battery yourself; however, it is always best to have a certified electrician/solar installer do it, as this ensures all standards are met for certification and insurance purposes. All solar installers have been certified as electrical contractors prior to being employed by the company. Therefore having a professional on the job may be beneficial to ensure an energy-efficient system and long-lasting savings.

What are 3 drawbacks to storing solar energy in batteries?

The three primary drawbacks to storing solar energy in batteries include cost, inefficiency, and environmental impact. Batteries used for solar storage can be quite expensive, making the initial investment large. They also can require frequent maintenance and incur additional costs over time. Furthermore, they are not always efficient at transferring energy and can also release harmful toxins into the environment.

Does a solar battery pay for itself?

Investing in a solar battery can pay for itself in the long run due to reduced electricity bills. Not only can solar batteries help you save money on monthly utility bills, but they also provide an environmentally-friendly way to power your home, as solar energy eliminates reliance on fossil fuels. Furthermore, depending on where you live, you may be eligible for tax breaks and other incentives which will help offset the initial cost of installation.

How big of a solar system do I need to go off-grid?

Going off-grid requires a significant solar array to power your home. The average size for an off-grid system is 7 kilowatts (7,000 watts) to account for both energy demand and battery storage. This can be provided by around 24-30 solar panels depending on the wattage of the panel you select. With these panels providing enough electricity during sunny days and with the addition of a battery bank, you can produce enough energy to stay off-grid all year round.

Where is the best place to install a solar battery?

Installing a solar battery can be done both outdoors and indoors. For optimal protection and power storage, the ideal place to install a solar battery is in a garage, away from direct sun exposure. Placing it in the garage also helps protect it from inclement weather and other potential hazards, which may reduce its life expectancy. It is important to note that any area you choose should be well-ventilated to keep the temperature within a safe range. With proper placement, an efficient solar battery can efficiently provide power storage to any home.

What happens if your solar panels produce too much electricity?

If your solar panels produce more electricity than you need, the excess power can be fed back into the electrical grid. This process is known as net metering, and it allows homeowners who generate their own power to be credited on their utility bills for the extra energy they produce. In most cases, customers are paid market rates for any extra electricity they provide to the grid. This benefit helps make residential solar energy even more attractive and cost-effective in the long run.

Can you overcharge a battery using solar panels?

Without a battery management system in place, solar panels can overcharge batteries, leading to permanent damage or even explosions. To avoid such problems, reduce the power or disconnect the battery from its charging source if its voltage and current output are too high.

Which solar batteries last the longest?

Lithium-ion batteries are some of the most reliable and long-lasting solar power batteries on the market, with an industry-leading average lifespan of over 10 years. They outlast many other battery replacements multiple times over and provide sophisticated energy management systems.

Which is better: AGM or gel battery?

AGM and gel batteries are both types of lead acid batteries that don’t require maintenance. They can be discharged more fully than flooded-lead acid batteries. However, gel batteries can be damaged permanently if overcharged, while AGM do not suffer this drawback. Ultimately, the best choice depends on specific application requirements and needs.

What are deep-cycle batteries?

Deep cycle batteries, also known as deep cycle solar batteries, are a type of rechargeable battery designed to provide a steady amount of power over an extended period of time. A deep-cycle battery can be used in a variety of applications, including renewable energy storage and backup power.

What is the difference between a deep-cycle solar battery and a regular one?

Deep-cycle solar batteries are designed to be regularly discharged and recharged, making them ideal for applications such as off-grid power systems. Regular car batteries are not designed for regular deep discharge and recharging, so their performance suffers over time if used in a solar system. Lithium batteries are increasingly popular due to their high energy density, long life, and minimal maintenance, along with their potential for regular deep discharges.


Solar panels are an excellent option for those looking to reduce their environmental impact and save money on energy costs. By choosing the right solar battery, you will be able to make sure you get the most out of your solar panel investment. Deep-cycle solar batteries offer long-term use between charge cycles, while lithium batteries provide rapid charge times and long shelf life. For larger projects, a battery bank may be your best choice since it will provide an uninterrupted source of power when needed. No matter which type of battery you choose, the important thing is to do your research so that you can make an informed decision when buying batteries for your solar panel system.


What is the main disadvantage of an AGM battery?

AGM (absorbed glass mat) batteries are among the most popular battery types due to their long lifespan and low maintenance compared to flooded-lead acid. However, they come with a significant cost disadvantage of higher cost compared to other lead acid batteries. 

What are the disadvantages of a gel battery?

Gel batteries are known for their robustness compared to traditional lead-acid equivalents; however, they can suffer from many drawbacks. These include lower ampere-hour capacity, higher initial and long-term costs, and a limited charging current which might not be suitable for certain applications.

How many years does a gel battery last?

Gel batteries usually last 5-10 years, depending on the quality and usage. This can vary significantly due to the charge rate and other variables.

Can solar panels power a house during a power outage?

While grid-tied systems allow you to use electricity from the grid in case of bad weather and sell excess electricity back to the grid to save on your energy bills, adding batteries to your solar installation will help you power your house during a power outage. It's important to check your battery capacity to be able to run your house entirely on a power bank when needed.