What Is The Best Battery For Solar?

Are you searching for an article that explains what the best battery for solar is? This article will give you all the information you need.

Finding the best solar batteries is becoming an essential aspect of home energy system installation because homeowners tend to search for the best solar panels. After all, your solar panels can’t be perfect if you can’t store any of the excess energy for use at night or when the sun isn’t shining.

Thanks to recent advancements, energy storage is no longer a stumbling block to solar power’s large-scale efficiency. Currently, there are various batteries on the market that will permit you to make full use of your solar production.

In this article, I’ll explain the operation of solar batteries and why their solar installation will continue to be vital for decades.

What Is A Solar Battery?

What Is A Solar Battery_ (1)

First and foremost, I’ll begin with a basic explanation of a solar battery.

A solar battery is a device that you can use to save the extra electricity that your solar panels generate. Simply put, a solar battery allows you to keep your appliances running when there’s a blackout.

Also, you can refer to them as “deep cycle batteries” since they can charge and discharge a large amount of energy than regular batteries or car batteries.

On cloudy days or during power outages when your solar panels aren’t taking in enough solar energy, you can use the energy stored in the solar battery to power your home.

In general, a solar battery assists you in making ideal use of the solar energy your solar panels absorb. Plus, excess solar energy returns to the grid if you don’t have a battery to store them.

How Solar Battery Works

How Solar Battery Works

First and foremost, you’ll already have an array of solar panels installed on your roof if you decide to go solar. These solar panels take energy from the sun and transform it into an electric current.

If you didn’t know, the excess energy your solar energy system creates returns to the grid because the solar panel system in our homes connects to the local power grid. You’ll be able to get credits for the energy you do not use if your utility company has a net metering program.

To fully utilize the excess energy your solar energy system creates is where the solar batteries come into place. I will talk more about this in the next section.

Using A Solar Battery Bank

Using A Solar Battery Bank

Now, where do batteries come into the picture? Instead of returning to the grid, the energy your system creates will be stored by a solar battery bank so that you can use it anytime you want to.

Therefore, in your solar battery bank, you can use the energy reserves when your device is not generating any energy (for example, after cloudy or dark days).

Also, the more energy you save, the less energy you’ll need to buy from your utility company since the solar battery’s basics are straightforward.

As a result, people are beginning to see the usefulness of solar batteries as backup power during a long blackout. In addition, backup batteries and solar panels are becoming the norm for individuals in outage-prone areas due to extreme weather, which reveals the system’s weaknesses.

Factors To Consider When Choosing The Best Solar Battery

Factors To Consider When Choosing The Best Solar Battery

You’ll have a few options to select from when choosing solar panels and backup batteries for your solar system. Keep the following points in mind when you are looking for the best solar batteries you can use for your home.

Capacity Of The Battery

The total amount of electricity you can store in your battery is what we call capacity. Generally, we measure capacity in kilowatt-hours (kWh).

You can reserve the collective storage capacity for you to store a higher amount of energy when you combine multiple batteries since most solar batteries are modular (or stackable).

Power Rating

Also, take a look at the rate of power in addition to the solar battery’s capacity.

Typically, the measurement is in kilowatts (kW), and at any given time, this explains the amount of power the battery can supply. Bear in mind the difference between continuous power rating and peak power rating.

Peak Power

The maximum amount of energy that a solar battery provides at any moment is what we call peak power.

Continuous Power

For a duration of time, the energy a solar battery creates is called continuous power. Therefore, it is an important figure when it comes to continuous power rating.

With that being said, you may be wondering about the similarity between power and capacity? Let me explain with an example.

Take a battery with a low power rating but with a high capacity. This battery can create a tiny amount of electrical energy for a long period.

Meanwhile, for big appliances, a low capacity but high-power battery can generate maximum electricity, but it can’t power them for a long period.

Depth Of Discharge

The amount of energy you can draw from a battery before it impacts its lifespan is the depth of discharge (DoD).

Note that a battery’s lifespan will be shortened if you draw a batter’s charge of 100%. 10kWh is the average for home solar batteries.

You will not want to use more than 8kWh from your battery without recharging it if the battery has a depth of discharge of 80%.

Lastly, the more power you can draw from the battery without recharging it at a time, the greater the depth of discharge.

Round-trip Efficiency

Batteries, like some devices in your home, need energy to function. A round-trip efficiency indicates how well a battery can work in a single cycle.

The level of electricity you’ll get from the battery when it uses the energy it requires is round-trip efficiency. In essence, it will use up all the energy it stores.

Therefore, a battery has an efficiency of 80% round-trip if a normal 10kWh battery allows you to draw down 8kWh.

Battery Duration

Basically, this metric determines how long a solar battery can function without recharging. It is important to note that a battery’s time could determine its lifespan.

For instance, a utility-scale lithium-ion battery can last for 4 hours. With battery banks or a collection of batteries, the life of a battery will increase.

Note that if you want your solar battery to last longer, you should reduce your energy consumption.

Warranty Options and Battery Lifespan

The ability of a battery to keep a charge will decrease over a continuous cycle. This is because one charge and one discharge make up a battery’s cycle.

A battery can endure a specific number of cycles or years, running at a particular capacity. Most times, all of this information is provided by a warranty.

For instance, a solar battery distributor can sell a battery with a 10 year or 5,000 cycle warranty to you and a guarantee of 80 percent battery capacity over that time or cycle.

Types Of Batteries For Solar Panels

Types Of Batteries For Solar Panels

Lead-Acid Batteries

For over 100 years, lead-acid batteries have been available commercially and used for off-grid solar systems for decades. They are usually of two types which include flooded lead-acid or wet-cell types.

For decades, off-grid systems have depended on wet-cell deep cycle batteries since they give reliable storage at a low cost. On the other hand, the flooded batteries need to be fed with water regularly to keep their electrolytes from evaporating while charging.

Generally, the usefulness of lead-acid batteries comes from the watt-hour capacity to cost ratio. Also, they have a shorter lifespan and a low DoD than lithium-ion batteries because they are cheap.

As a result, you may need to replace them every few years because of their short battery lifespan. In addition, if you don’t care for and use your battery correctly, their lifespan can be cut in half.

Additionally, lead-acid batteries release harmful fumes when they are overcharged since they are heavy and bulky. Another thing to consider is that if you use this battery regularly, you’ll need to maintain and ventilate it.

Since lead-acid batteries mostly have low DoD and frequent maintenance requirements make, they are unsuitable for a backup system.

Lithium-ion Batteries

As electric vehicle firms like Tesla continue their development and improvement, lithium-ion batteries have increased to be the most popular method of solar storage.

In essence, lithium-ion batteries are an ideal choice because they are sleeker, smaller, and last long. In addition, you can use the battery’s charge to power your loads since lithium-ion batteries have a high DoD in comparison to lead-acid batteries.

Also, they will last longer than a lead-acid battery, thereby reducing cost.

Furthermore, lithium-ion batteries are ideal over less powerful lead-acid batteries for powering your equipment. This is because they do not release harmful gasses or fumes that lead-acid batteries do.

Lastly, the solar battery is easy to install and needs little maintenance due to its lighter form.

Saltwater Batteries

Sodium batteries or saltwater batteries create energy by using salt. It is a safer choice due to its ability to produce long-lasting and harmless power.

You can drain saltwater batteries, unlike lithium-ion batteries. However, you can damage the batteries if you try this with lithium-ion or lead-acid batteries.

Also, their chemical nature removes the risk of fire, and they work over a wider temperature range. Hence, they are 100% recyclable.

However, saltwater batteries are more pricey than lead-acid batteries, although not as much as lithium-ion batteries.

In comparison to lithium-ion batteries, saltwater batteries offer less capacity and power.

Finally, the perfect battery for your solar system depends on your specific needs, whether you are interested in overall efficiency, initial investment, or safety.

Flow Batteries

An exciting emerging technology that will compete with lithium-ion batteries is flow batteries.

It creates a flow of energy between two separate chambers within the battery since an electrolyte liquid undergoes a chemical reaction when supplied with power from solar panels.

Although they don’t need many rare metals, flow batteries are captivating because of their 100% depth of discharge and relative simplicity.

Unfortunately, flow batteries are large for applications in residences.

Solar Gel Battery

Solar gel batteries are better for solar owners who move from place to place.

They are an ideal battery for owners of RVs or people who intend to travel with a solar battery because these battery does not stay upright, which means they can move around perfectly.

Lithium-ion Polymer Battery

The lithium-ion polymer battery is more pricey and has a short duration, but they are similar to lithium-ion batteries.

Plus, it is protected against overcharging or leakage.

Deep-Cycle Battery

If you need a battery that can keep a continuous stream of energy over a long duration, the deep cycle battery is perfect.

Benefits Of Solar Battery Storage

Benefits Of Solar Battery Storage

For you to get the most out of your solar system, you’ll need a battery backup for your solar panel.

These are the following benefits of a home solar battery storage system:

Stores Excess Electricity Generation

On days when there is no one at home, and there is sufficient sunlight, your solar panel can generate more power than you’ll require.

This additional energy goes to the grid if you don’t have solar energy battery storage.

You can get credit for that additional generation if you engage in a net metering program, but it is usually not a 1:1 ratio for the electricity you generate.

You can store the excess solar energy to generate electricity for later use with a solar battery.

Provides Relief from Blackouts

You’ll have electricity in your home during power outages or when the grid goes down because your batteries stores the excess energy your solar panels create.

Cuts Down Your Carbon Output

You can go green by storing the clean energy your solar panels generates with solar panel battery storage.

If you don’t have solar batteries to store excess energy, you will depend on the grid. You’ll be utilizing dirty energy if you use the electricity from the grid since most of it is gotten from fossil fuels.

Power Backup In A Quiet Environment

A complete silent backup power storage is what a solar battery offers you. As a result, you’ll enjoy the benefits of maintenance-free clean energy without dealing with the noise a generator produces.



ExpertPower 12v 33ah Rechargeable Deep Cycle Battery 

Due to its great benefits, you’ll like this product because it is an ideal option for solar power storage.

ExpertPower has a wide temperature range. Also, the technology it uses is AGM (Absorbed Glass Mat).

The installation of this product is smooth.

Lastly, it comes with a recharge temperature of 20°C to 50°C and a temperature discharge of 40°C to 60°C.

Best Components

  • User-Friendly
  • Battery type of 12V 33Ah deep-cycle
  • Operational temperature
  • It is an AGM battery

Best Budget – Vmaxtanks VMAXSLR125 AGM 12V Rechargeable Deep Cycle Battery

This battery ranks high amongst many other top-notch batteries because of its deep-cycle absorbed glass mat (AGM).

Also, it has tailor-made plates of military-grade and Hex Screw in terminals of 8mm.

Furthermore, it doesn’t release any harmful gas or fume since it has an inbuilt 99% recombination capabilities.

Even at minimal sunlight, it provides you with power because the battery is perfect for cold weather.

Renogy Deep Cycle AGM Battery 12 Volt 100Ah

The Renogy Deep Cycle AGM 12 Volt is an excellent solar battery choice for home use. This product can take up a huge space because it is bulky, but it is ideal for solar energy storage.

Also, you don’t need much knowledge for it to work since installing the Renogy Deep Cycle is easy.

In addition, you don’t need to monitor it because this solar battery requires no maintenance.

Best Components

  • Compatibility
  • 1280 Wh of battery life in a compact bank
  • Popular brand


  • Quite expensive
  • 5-year warranty
  • 2,000 lifecycles

Best Overall – Battle Born Batteries LiFePO4 Deep Cycle Battery

One of the best solar batteries you can find in the market is the LiFePO4 12V. It is a lithium-ion battery that is strong safe and it is a dependable deep cycle battery.

Also, it comes with a battery management system that protects your battery from battery failures such as temperature volatility or ground faults.

Best Components

  • 200Ah surge protection for 30 seconds
  • It has a durable build
  • Popular brand
  • 10-year warranty
  • Charging temperatures of 25°F


  • Higher upfront cost
  • Heavier and larger than other batteries.



Overall, if you think of adding solar panel energy storage to your solar power system, you should know how they work.

From this article, we have learned that with a solar battery, you can use the excess solar energy your solar panels generate. It also provides you with more flexibility in how you use solar energy.

Currently, the lithium-ion battery is the most recommended for most industrial and residential installations.

I hope you found this PowerVersity pick helpful?

If you found it helpful, kindly share your thoughts with the “Leave a Reply” form found towards the end of this page.

Finally, you may want to read other articles like this. Visit our below pages.

What Is A Solar Battery

5 Best 200 Watt Solar Panel

What Is Solar Street Light

What Is A Solar Power Bank

Akpan Iniobong
Akpan Iniobong is a Technical Writer for PowerVersity.com. She has a B.A in Religious Studies. She loves hiking, reading, and socializing. In PowerVersity.com, she writes buying guides and product best picks.
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