Solar Batteries Explained

Solar Batteries Explained
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Solar batteries can improve the efficiency and adaptability of your solar system, regardless of whether you are new to the world of solar electricity or not.

It’s possible that you currently have a solar photovoltaic (PV) system and are considering adding battery storage.

Or you are preparing to construct a new solar panel system and are debating whether it will be worthwhile to add solar battery storage.

This powerversity guide is intended to assist you in determining if you require battery storage and, if so, which type of storage is best for your installation.

The extra electricity produced by your solar panels may be stored in solar batteries and utilized to power your home on cloudy, rainy days or after sunset.

This powerversity guide to solar batteries can help you choose the best solution to suit the demands of your facilities—homes, offices, or factories.

Besides, it will provide answers to your concerns regarding solar batteries under the frequently asked questions section.

Meanwhile, you should note that not all marketers of solar batteries have installation knowledge.

Therefore, get the advice of an expert battery installer before you install if you can’t do it yourself.

Solar Batteries Explained: How Does A Solar Battery Work?

Understanding how energy storage systems function is important, given the growing interest in energy storage technology.

Moreover, it might be easier for you to decide whether energy storage is the best option for you if you are aware of how energy storage systems work with solar panel systems.

I will show you how energy storage systems work alongside solar panels in the sections below. Solar batteries, at their most advanced, store energy for later use.

There are a few general procedures to comprehend if you have a home solar panel installation.

  • Solar panels use the power of the sun to produce electricity.
  • This direct current (DC) power is converted into alternating current (AC) electricity via an inverter.
  • Your household appliances are powered by alternating current (AC).
  • The extra power that is not consumed by your appliances is used to charge your batteries.
  • When the sun sets, the stored energy in your battery powers your appliances.

How lithium-ion batteries work?

The most common type of solar battery is a lithium-ion one, which works by storing energy through a chemical process and then releasing it as electrical energy for use in your house.

A lithium-ion battery is now the most prevalent form of battery available for residential energy storage.

It’s a fairly well-known, secure technology that powers a wide variety of everyday items, including cell phones and automobiles.

The process by which lithium ions are transported via an electrolyte inside a lithium-ion battery gives this type of battery its name.

Moving the lithium ions from the anode to the cathode results in free electrons, which are electrons that have been freed from lithium atoms, since ions are particles that have received or lost an electron.

Batteries eventually charge and store electricity through the accumulation of these free electrons.

You may charge and discharge lithium-ion batteries hundreds or even thousands of times because, when you discharge the power stored in the battery, the flow of lithium ions is reversed. will earn a tiny commission if you purchase a product from one of the links in this article. This enables us to keep the lights on, but it does not impact the price you pay. Visit our Affiliate Disclosure page for more details.

Benefits of Solar System plus Solar battery storage system

You will be able to draw power from the grid or your battery when it is charged if you install a battery along with your solar panel installation.

Two significant implications emerge from this

Backup power comes from batteries.

The combination of solar and storage will create a small energy island at your home, allowing you to function “off-grid” even though you will still be linked to the grid.

So even if there is a power outage brought on by severe weather or a utility cutoff, you may continue to use your lights.

Regarding backup power, there are two things to consider.

First of all, even on a sunny day, if you only have a solar panel system without a battery, you won’t have electricity in the case of an outage.

This is so that it won’t transfer energy onto transmission lines while utility employees are working to restore them, which might be dangerous.

Your solar panel system will turn off in the event of a power outage.

On the other hand, the majority of batteries only supply backup power for a portion of your home.

Most battery setups call for you to choose which areas of your house you want to back up with the battery and pull those loads onto a critical load panel (which is an excellent method to get the most out of a storage system).

Although several batteries may be “stacked,” this simply means that you can keep adding batteries until you reach the desired storage capacity.

The expense of buying enough batteries to offer whole-home backup may be prohibitive, despite the fact that it may be possible to do so.

Batteries can assist you in avoiding costly electricity charges.

Combining a storage system with your solar panels can help you avoid paying excessive utility rates.

Since it enables you to draw power from your battery rather than the electrical grid,. Batteries can accomplish this in one of two ways.

First, you can draw power from your battery during peak hours when your utility is charging extra for energy if you are on a time-of-use or other time-varying rate.

Second, a battery can significantly reduce your monthly demand fee if you are on a rate with a demand charge, which is more common for commercial and industrial businesses than for homes.

Solar Batteries Explained: Types Of Solar Battery

In the realm of solar energy, lead-acid, lithium-ion, nickel-cadmium, and flow batteries are the four primary battery types.

Solar Batteries Explained: Lead-Acid Batteries

Since they have been available for so long, lead-acid batteries are among the most popular battery types utilized in commercial and industrial settings.

They have a low energy density, which means they can’t retain a lot of energy per kilogram of weight, but they are still affordable and dependable, hence they are frequently used in household solar systems.

Depending on the intended use and safe depth of discharge (DOD), lead-acid batteries can be either shallow-cycle or deep-cycle and come in both flooded and sealed variants.

Because of recent technical developments, these batteries now last longer, and many homeowners still find lead-acid batteries to be an excellent choice.

Solar Batteries Explained: Nickel-Cadmium Batteries

Due to their exceptional endurance and unique capacity to operate in harsh temperatures, nickel-cadmium batteries are mostly employed in industrial and aircraft applications rather than in homes.

Comparing nickel-cadmium batteries to other battery types, they also need less maintenance.

Unfortunately, cadmium is a highly hazardous metal that may harm our environment severely if it is not properly disposed of.

Solar Batteries Explained: Flow Batteries

Chemical reactions are what power flow batteries do. The battery’s two chambers exchange energy by means of electrolyte-containing liquid flowing between them.

The tanks housing the electrolyte liquid in flow batteries must be relatively large.

This will help to store a considerable quantity of energy, despite the fact that they have high efficiency and a discharge depth of 100%.

This is due to the poor energy density of flow batteries. They are a pricey and unusable solution for the majority of domestic uses due to their size.

For use in larger environments and applications, flow batteries are a much superior choice.

Solar Batteries Explained: Lithium-Ion Batteries

Lithium-ion batteries use significantly more recent technology than previous battery kinds.

High energy-density lithium-ion batteries provide a more compact, lightweight, and effective alternative.

They are excellent for use in computers, phones, and your house since they let the user access more of the battery’s stored energy before needing to be recharged.

The huge increase in price for consumers that comes with lithium-ion batteries is its main disadvantage.

Due to a phenomenon known as thermal runaway, lithium-ion batteries can potentially catch fire if fitted incorrectly.

What to Consider When Choosing a Solar Battery

The performance of your solar battery depends on a number of variables. Think about the following when selecting your battery system:

The Battery capacity

Amp-hours, or simply amps, are used to grade batteries. The battery’s totally developed capacity is usually represented by the specified power rating.

This means that the battery may need to be charged tens to hundreds of times before it can reach the advertised maximum capacity.

To put it another way, testing your battery after only a few charges might be deceiving.

To calculate your power requirements or choose the right size for your batteries, you do not need to be an expert in electrical physics.

This article might assist you in estimating your power use based on your electricity bills if you currently utilize grid power.

Always estimate your peak power needs in amp-hours as a general guideline. For example, a battery rated at 100 amp-hours has a theoretical output of 1 amp for 100 hours or 10 amps for 10 hours.

Understanding your power requirements can help you choose a solar battery with adequate energy storage.

Be aware that batteries with prolonged warm-up times before reaching full capacity have a higher likelihood of outlasting those with proclaimed high beginning capacities.

Types And Materials Used

Each of the several kinds of batteries available has a distinctive key benefit. You may select the fashion that is best for you by weighing these advantages and disadvantages.

Lithium-ion batteries can be what you need if you want something small and long-lasting. For people with more severe financial restrictions right away, lead-acid batteries could be preferable.

Battery Life Span Of A Battery

Every battery’s “lifespan” is dependent on a number of factors, including age, type, quality, and depth of depletion.

You may find out how long a battery will survive by looking at the manufacturer’s specs.

According to how they are used, lead-acid batteries typically have a lifespan of one to ten years.

Battery life for lithium-ion devices ranges between seven and fifteen years.

Depth Of Discharge

The amount of stored energy that is used up before a battery is recharged is referred to as the depth of discharge.

Generally speaking, a battery’s lifespan will decrease the deeper it is depleted.

Batteries sometimes include a suggested maximum depth of discharge as well as an estimate of cycle life, which shows how many cycles the battery will endure for a specific depth of discharge.

Both lead-acid and lithium-ion batteries will degrade more rapidly when deeply depleted.

Although lead-acid batteries have a tendency to have a lower tolerance for deep discharges than lithium-ion batteries, this drastically shortens life expectancy if deeply discharged often.


The process of moving solar energy from panels to batteries using solar systems and batteries is not entirely efficient since some energy is wasted.

Therefore, it can be worthwhile to spend extra money on a more costly, more efficient battery, depending on how much energy you can produce from your panels and how your system is set up.

Meanwhile, long-term savings from this are possible. Any qualified sales and installation staff will assess the efficiency of your solar panels, estimate the capacity of your batteries, and explain your system to you.

However, our solar resources can also assist you in fully comprehending how your system functions.

Solar Batteries Explained: Frequently Asked Questions

1. Which type of battery is best for solar system?

As earlier said in this article, lithium-ion batteries are the best for the solar system.
Lead acid, lithium-ion, and saltwater are the three chemical compositions most commonly utilized to make batteries for home energy storage.
Despite the fact that alternative battery types could be more cost-effective, lithium-ion batteries are often the best choice for a solar panel system.

2. What happens when solar batteries are empty?

Your surplus energy is then transmitted back to the grid after your solar batteries are completely charged. Only when your battery is entirely depleted will you ever need power from the national grid.
The more solar energy can be stored in your battery the bigger its capacity. Hence, increasing savings.

3. Which solar battery last long?

Fortunately, the lithium-ion batteries used in the majority of contemporary home solar energy systems have a lifespan far greater than that of a typical lead-acid battery.
Depending on how well you take care of it and how often you use it, a high-quality lithium-ion solar battery should last anywhere from five to fifteen years.

4. How many solar panels does it take to charge a 100Ah battery?

A 100 amp-hour battery will take five hours to fully charge at 12 volts and 20 amps. We advise utilizing a 300-watt solar panel or three 100-watt solar panels since 20 amps multiplied by 12 volts equals 240 watts

5. How can I extend my solar battery life?

If you can, keep your battery bank to 16 batteries or less.
Replace the batteries. If your battery bank is large, rotate the batteries in it from time to time.
Connect your batteries using broad cables.
Charge your battery as directed.
Don’t stop boiling or gassing.
Equalization of batteries.

Solar Batteries Explained: My Final Thoughts

Solar batteries are an expensive upfront investment, but they can potentially help you save money by reducing your energy expenses after sunset or in an emergency.

They could be crucial elements of your energy system if you live off the grid.

Instead of requiring energy from outside sources, solar batteries may supply your home with clean, comparatively environmentally friendly, renewable energy.

If you meet the requirements for the federal solar tax credit, you may be able to earn up to 30% off the cost of your battery installation.

Some regions may provide incentives or rebates to help offset the expenses of adding a solar battery to your system.

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Akin-Ojo Victor
Victor Akin-Ojo is the founder and the Lead Editor of Before starting, Victor worked in the IT industry for nearly 15 years as Field Support Engineer for VSAT, Networking, and Wimax Technologies. He also work in the power sector for close to 10 years. He currently run a blog -, where he share his knowledge on Alternative Energy Solutions.