Top 12 Best Solar Batteries of 2021 – Reviews & Buying Guide

1. Universal Power Group
Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery...
2. Mighty Max
Mighty Max Battery ML12-12 - 12V 12AH F2 SLA AGM DEEP-Cycle Rechargeable...
3. Vmaxtanks
Vmaxtanks VMAXSLR125 AGM 12V 125Ah SLA Rechargeable Deep Cycle Battery for...
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1. Universal Power Group
Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery...
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2. Mighty Max
Mighty Max Battery ML12-12 - 12V 12AH F2 SLA AGM DEEP-Cycle Rechargeable...
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3. Vmaxtanks
Vmaxtanks VMAXSLR125 AGM 12V 125Ah SLA Rechargeable Deep Cycle Battery for...
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Solar Batteries are the trend nowadays because of the benefits they promote. It will help you save money on electricity bills, it results in decreased energy consumption, and it lessens the carbon footprint, which makes it great for the environment.

With these benefits from solar energy comes a hefty price tag, which is why it is important to research what the best solar batteries are before you purchase one.


Buying Guide For The Best Solar Batteries

To help you determine the best solar battery, go through this article that will feature a comprehensive buying guide and a Top 12 list of the best solar batteries in the market today.

Knowing each product’s features will help you determine which brand to invest in and how to maximize its use. Before anything else, though, it is crucial to know how to choose your solar battery.

1. Determine The Capacity And Power You Need

The capacity of your battery is the amount of electricity it can store. Most solar batteries are created to be “stackable,” which means that you can use multiple batteries at a time to get extra capacity.

Although the capacity of your battery can determine the total amount of electricity it can sustain, it does not determine the amount of electricity it provides at a given moment. This is why it is equally crucial to know what the power rating is.

This particular feature will help you determine the electricity used each time. While the capacity is measured per kilowatt-hours, the power rating is measured in kilowatts.

A battery that has a high capacity and a low power rating will only run a few appliances for a more extended period. A battery with a low capacity and a high-power rating can run all the appliances in your home, but only for a few hours.

2. Know The Depth Of Discharge (DOD)

The depth of discharge of a battery is the amount of capacity that has been used. Most manufacturers will indicate a maximum capacity for batteries to ensure their optimal performance.

For instance, a 5 kWh (kilowatt-hour) has a depth of discharge at 90%. This means that you shouldn’t exceed 4.5 kWh before it is recharged. The higher your depth of discharge, the more you can maximize your battery.

It is important to note that solar batteries cannot be emptied before charging because of its chemical composition. Using up the entire capacity of your battery before charging it can ultimately lessen or shorten its life.

3. Check The Round-trip Efficiency

The round-trip efficiency of the battery will determine the amount of “energy that can be used as a percentage of the amount of energy that it took to store it.”

This means that if you store 10 kWh of electricity to your battery, but you only get up to 8 kWh of “useful energy back,” then the battery has an 80% round trip efficiency. This means that a higher round-trip efficiency can give you more value for your battery.

4. Identify Battery Life And Warranty

A cycle refers to the life a battery has from the time it is charged to the time it is drained. For most solar batteries used at home, one cycle is likely to last just one day. However, it will ultimately depend on what you use it for, and how much energy the appliances you have will consume.

It is important to note that as you continually use your solar battery, its life, or the ability to hold a charge will decrease. So, as time passes, the original capacity can reduce by up to 30% of its original capability.

This is why it is essential to note the warranty on your solar battery. You need to check the number of cycles or the years it will be useful that the manufacturer guarantees.

Generally, a life span of a solar battery can last between 5 to 15 years. You will need to find a brand that will promise you a good percentage of its capacity throughout its warranty.

5. Choose The Best Batteries For Solar Use

Batteries for solar use are made of one of these chemical compositions: lead-acid, lithium-ion, and saltwater.

  • Lead Acid

This type is a tried and tested technology, and is probably the best solar battery for solar off-grid systems. It is one of the more affordable options and can be used for your home. The downside of this battery.

However, is its relatively short life and lower depth of discharge. This means that you are prone to replacing this more often, and you are likely not able to maximize its full potential because of its low DoD.

  • Lithium-Ion

Lithium-Ion is probably the best batteries for solar power storage. This type is lighter and more compact compared to the lead-acid batteries. Its lifespan is also longer, meaning it can last more years than the affordable lead-acid counterpart.

Its depth of discharge is even higher, so you are likely to maximize the full potential of your battery. However, it is crucial to note that lithium-ion batteries will cost more than its lead-acid counterparts because of all these benefits that it presents.

  • Saltwater

Saltwater is the newest type of battery that has been introduced to the home energy storage industry. Unlike its two other counterparts, this type does not contain heavy metals like lead and lithium. Instead, it relies heavily on its main component: saltwater electrolytes.

The good thing about this type is that it does not have to be disposed of once it comes to the end of its lifespan. It could, instead, be recycled. However, the downside of this innovation is it still lacks studies and tests to support its reliability.

  • Budget

Solar Batteries can be expensive, which is why it is vital to determine just how much you are willing to spend on it. Naturally, the higher quality batteries will come out more expensive, while the more affordable ones are likely to be sub-par.

It is, therefore, crucial that you do not rush into buying batteries just because they are cheaper. Do your research, check reviews, and compare the battery of your choice to its other counterparts to see how it fairs.

  • Charging Time

Just like your mobile phone, different types of batteries will vary in how fast they charge. To be able to maximize the amount of energy that you will generate from your solar panel system, it would be best to get a fast-charging solar battery.

Lithium-ion batteries are generally fast, only taking up an average of 3 hours to fully charge. Some lead-acid batteries, like gel batteries in particular, also have fast charging times.

Flooded lead-acid ones, however, may take up to a day just to be fully recharged. This is something to consider, especially since you would not want to wait a whole day only to charge batteries that power your entire home.

Top 12 Best Solar Batteries 2020

1. Universal Power Group

Universal Power Group

Number one on our list is the Universal Power Group’s AGM SLA deep cycle battery. Naturally, we consider it to be the best solar battery in the market today. It is a reliable brand and a durable battery at a very competitive price.

This particular product stands out because it makes use of two different technologies: it is both a gel and AGM lead-acid battery.

This means that it combines the best features of both types – it gives you high energy discharges while protecting the plate. This characteristic makes it an excellent option for your indoor or outdoor systems.

However, the downside of this battery is that it’s designed to be used for 3-5 years only. Despite this, it still gives you the energy that you need, and its cycles can still last long provided that is used properly. Most users also claim that this battery will give you the best value for your money.


  • It uses Gel and AGM technology.
  • It is a very reliable brand and a sturdy battery.
  • It recharges well and fast.
  • It works well even in lower temperatures.
  • Users believe you get the best value for your money with this product.
  • Lasts long when appropriately used. Some have claimed that it can last up to three 6-hour days on one charge.
  • It requires no maintenance.
  • It provides plenty of power.


  • Its lifespan is short at only 3-5 years.
  • Some batteries degrade when charged below 50%. This means that when not handled properly, the cycle of the battery drastically shortens.

What Makes It Different:

This solar battery gives you a long cycle, even if its life span is short. It has been dubbed as the best value for your buck because of the amount of power it can give in just one charge. It is genuinely hassle-free and maintenance-free because of this. You no longer have to continually charge your batteries provided that you use it with care.

Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery...
  • UPG #45978 UB121000 12V 100Ah
  • Dimensions: 12.17 inches x 6.61 inches x 9.16 inches. Weight: 63.93 Lbs

2. Mighty Max Battery ML12-12

Mighty Max Battery ML12-12

Mighty Max is one of the best batteries for solar off-grid systems because it provides you with exceptional performance and a long-life span, whether in its float or cyclic application. Like the other products, it is also easy to install and requires no maintenance.

The Mighty Max battery also makes use of the AGM technology that gives you the energy you need when you need it. At the same time, it has a valve regulated design that makes it possible to use in indoor environments like your RV.

It is a rechargeable battery that boasts of a lifespan of ten years. It can be used in high or low temperatures, making it an excellent option for outdoor use – as in for electric vehicles, power sports, lawn and garden tools, and solar systems.

It is also a deep discharge battery and can last up to several hours as long as it is fully charged. This gives you optimum use of it before it has to be recharged again. It is also a low self-discharging battery, at only 3% per month.


  • It can be used indoors or outdoors.
  • It has a lifespan of 10 years.
  • It is a deep discharge battery.
  • It has a slow discharge rate of 3%.
  • It is a high-quality battery, and you get value for your money.
  • It is a great battery to use for off-grid systems.


  • Some users claim it drains faster as compared to some of its other counterparts.
  • The casing has to be handled with care. Although it can withstand some shocks, it is not as sturdy as other batteries.
  • It has to be charged before use to ensure that it works well.

What Makes It Different:

These are great batteries to use for off-grid systems. A cycle can last long, its life span is ten years, and its discharge rate is slow. All of these are great, especially when you’re in your RV and needing to power a few appliances at a time.

Mighty Max Battery ML12-12 - 12V 12AH F2 SLA AGM DEEP-Cycle Rechargeable...
  • ML12-12F2 SLA is a 12V 12AH Sealed Lead Acid (SLA) rechargeable maintenance free battery, Pack of 2...
  • Dimensions: 5.94 inches x 3.86 inches x 3.98 inches. Terminal: F2. Listing is for the Battery only....

3. Vmaxtanks Vmaxslr125

Vmaxtanks Vmaxslr125

Third on our list is one of the best solar batteries in the market today. It is a deep cycle AGM heavy-duty battery that gives you the high bursts of energy that you need, whether for your home or your RV. It is great to use, especially for those who want to go off the grid.

Despite it being a lead-acid battery, it does not emit fumes like other brands because it is designed with 99% recombinant capabilities. So instead of emitting excess hydrogen and oxygen, it reuses these to power the battery further.

Like other Vmaxtanks batteries, it also uses military-grade plates that ensure its durability and safety. It will be close to impossible to tamper with it, thus ensuring it will remain spill-proof. The downside of this is the weight of the battery itself. It will be harder to lug around outdoors as compared to its more compact counterparts.

This particular model also has a fast recharge rate, a long cycle, and a ten-year life span. It also comes with a one-year warranty to ensure that you will be getting the best possible product you can afford.


  • It is easy to install and does not need any monitoring or maintenance.
  • It has a low self-discharge rate, which means it takes a while before it has to be charged again.
  • It works well, and the battery’s cycle lasts long.
  • It can run for about 8 hours on a full charge, and this can even extend when minimal appliances are used.
  • It is designed for fast charging.


  • The batteries are quite heavy, making it a hassle to bring around.
  • It cannot be discharged entirely as it will lessen the longevity of the battery.

What Makes It Different:

Its 99% recombinant technology is an excellent feature because not only does it keep the battery safe, it also keeps you safe by preventing the emission of hydrogen gas. It also becomes renewable in the sense because it can recycle its by-product, and use it to its advantage.

Vmaxtanks VMAXSLR125 AGM 12V 125Ah SLA Rechargeable Deep Cycle Battery for...
  • 12 Volt 125Ah Group 31 AGM Deep Cycle Heavy Duty Battery
  • Military grade custom made plates

4. ExpertPower 12v

ExpertPower 12v

The ExpertPower 12v 33ah Rechargeable battery is one of the best deep cycle batteries for solar systems. Several people love this product because of the many benefits it presents. It is also guaranteed to be of high quality, safe, and environment-friendly.

This battery is regarded as one of the “most trusted and highest reviewed sealed lead acid batteries” in the market today. It utilizes the AGM technology that ensures it produces high energy on demand.

It also functions well in a wide temperature range, making it perfect to use indoors, outdoors, in different weather conditions, and most especially during emergencies. You no longer have to worry about having back up power during thunderstorms or heat waves.

It is a very affordable battery because its lifespan is estimated at only 3 to 5 years. It charges pretty slow; its average is recorded at 11 hours. Despite this, it can still give you 100AH at a 10-hour rating.


  • It can function at low and high temperatures.
  • It comes in a compact, spill-proof case.
  • It is very affordable.
  • It has AGM technology.
  • Despite having a short lifespan, it does not compromise on its quality as it can give you 100AH at a 10-hour rating, much like other long-lasting brands.
  • It can give about 10 hours of continuous power provided that it is fully charged.


  • It lasts only 3-5 years.
  • It takes 11 hours to be fully charged.
  • It’s extremely small, and can only charge a limited number of electronics.

What Makes It Different:

Out of all the products on our list, this is the only one that has a short-term life span. Its compact design and affordable cost will only give you about 3-5 years with the battery. Despite that, it can do the job as long as it is used with minimally (i.e., not for big electronics that require too much energy).

ExpertPower 12v 33ah Rechargeable Deep Cycle Battery [EXP1233 ]
  • Genuine ExpertPower Battery - The Most Trusted And Highest Reviewed Sealed Lead Acid Batteries On...
  • Battery Type - 12 Volt 33Amp/10 Hour Sealed Lead Acid Battery

5. Mighty Max Battery 12V

Mighty Max Battery 12V

This is another deep cycle lead-acid rechargeable battery that promises a maintenance-free experience for its user. It features a computer designed lead, calcium tin alloy grid to ensure high power density.

To ensure that it can withstand the high power it surges it gives off, and possible external variables like shocks, temperature changes, and harsh weather conditions, the battery is encased in a robust and heavy-duty material.

Just like the other Mighty Max battery on our list, this product has a high discharge rate when being used, which gives you high performance. It can also be used in high and low temperatures, thus making it an excellent battery, especially during emergencies.

It has a long service life of 10 years; it also has a deep discharge recover, which means that you can use it longer before it needs to be recharged.

It also has a safety feature wherein if the battery is overcharged and produces too much oxygen and hydrogen. Special one-way valves will allow the gases to escape, thus ensuring that there is no excessive build-up, and the battery and its users are kept safe.


  • It is a heavy-duty battery that provides high energy surges that are needed to power electronics.
  • It has a long-life span.
  • It has a slow discharge rate, thus allowing you to maximize its use before needing to charge again.
  • It can be used in low or high temperatures.
  • It has a one-way safety valve that prevents pressure build-up.


  • If used in frigid temperatures, the battery’s cycle is shorter than usual.
  • When used on its own, the battery discharges fast if used with bigger appliances.
  • The casing may not be as sturdy as other batteries, which means it has to be handled carefully.

What Makes It Different:

This battery can be effective in low and high temperatures, which makes it a very versatile product. It’s great to use any time of the year, and it is especially useful during emergencies. Its one-way valve serves as a safety feature because it releases pressure build-up that could otherwise be harmful both to the battery and its owner.

Mighty Max Battery 12V 100AH Battery for Solar Wind DEEP Cycle VRLA 12V 24V...
  • ML100-12 SLA is a 12V 100AH group 30H Sealed Lead Acid (SLA) rechargeable maintenance free battery -...
  • Dimensions: 12.09 inches x 6.65 inches x 8.48 inches. Listing is for the Battery and Screws only. No...

6. Renogy 12V

Renogy 12V

Much like the other Renogy battery on our list, this 12V 200Ah battery is also heavy-duty, corrosion-resistant battery. It comes with a patented design structure that ensures the gel electrolytes are distributed equally throughout all the cells. This ensures evenness in all parts and gives you excellent internal resistance.

Gel batteries, which is another kind of lead-acid battery, is designed specifically for very deep discharges because it gives better protection to its structure, especially when high current surges are needed.

This particular product assures you of the long service life of about ten years as long as it is used under the optimal and recommended conditions. It also has a low self-discharge rate of about 3% per month.

Since lead-acid batteries are primarily composed of chemicals, it is a huge advantage if the battery is equipped with safety measures like Renogy’s explosion-proof valves. This feature prevents the production of redundant gas that may inadvertently interact with the lead of the battery.


  • It has a low self-discharge rate.
  • It is perfect for very deep discharges.
  • It has a long lifespan of ten years.
  • It performs well in hot environments.
  • It has essential safety precautions, given that it is a chemical-based battery.
  • It works well and can power a few electronics at a time. Works best, even when multiple batteries are used.


  • The 200aH rating is applicable for the 10-hour discharge, and not the standard 20 hours.
  • It will have to go through a series of charge and discharge cycles upon purchase to ensure that the batteries can perform well.

What Makes It Different:

Its explosion-proof feature is the bomb (pun intended)! The manufacturer took into account the possibility of redundant gases being produced from the environment or the by-products of the battery’s components. Taking the extra step to ensure that this will not interact with the lead is a big plus.

Renogy Deep Cycle Pure 2 Gel Battery 12V 200Ah
  • Long service life: Heavy duty lead-calcium grids ensure mild corrosion and enable a long designed...
  • Patent designed construction: Renogy batteries are equipped with PE compound separator construction,...

7. Renogy


Renogy is a deep cycle AGM battery that is perfect to use for solar energy applications. It is a high-quality product that is great to use as a daily power supply doe certain appliance or a source of backup power.

Although designed for off-grid systems, it can also be used for a variety of things like golf carts, consumer electronics, emergency lighting, and security systems.

The Renogy battery can last up to 10 hours when fully charged, provided it is supplying power for a few small appliances. Its operating temperature is reasonably flexible, thus giving you more leeway on when and where to use it. At 50% depth of discharge, it can still provide 600 cycles.

The cycle of the battery, although initially lasts for hours, can be severely affected by a lot of factors. To ensure that it is maximized to its highest potential, make sure that it is kept within the recommended temperature, it is never completely discharged, and the battery is appropriately recharged.


  • Very easy to install and requires no maintenance.
  • The cycle lasts long and is reasonably fast to recharge.
  • It is a high-quality battery at a very affordable price.
  • Works as advertised.
  • It has a relatively high depth of discharge, thus allowing you to achieve optimum performance.
  • It can be used indoors.
  • Material for the case is heavy-duty and is spill-proof.


  • It is quite bulky and takes up a lot of space.
  • Has to be charged at least 5 hours before use.
  • If drained, it has to be charged right away because it loses its capability to charge fully.
  • It is very heavy.

What Makes It Different:

This is a heavy-duty battery. Heavy because it weighs a whopping 66 pounds. Also, its case is composed of a sturdy lead-calcium alloy that makes it corrosion resistant. It can withstand temperature changes, strong shocks, and even different positions. This ensures your safety, and as well as the environment.

Renogy Deep Cycle AGM Battery 12 Volt 100Ah for RV, Solar Marine and...
  • Maintenance Free: Manufactured with thick absorbent glass mat (AGM) separators and advanced valve...
  • Excellent Discharge Performance: Proprietary quinary alloy plates and specially treated plate grids...

8. Battle Born LiFePO4

Battle Born LiFePO4

Battle Born is a lithium-ion phosphate battery used primarily for RVs, boats, and other off-grid power systems. It only weighs about 29 lbs but is comparable to a 140 lead-acid battery. It can be used in 12, 24, 36, and 48 Volt systems, which makes it a pretty powerful battery.

This particular brand comes with a built-in BMS or a battery management system. It is responsible for protecting your battery from the common causes of damage like drastic temperature changes and strong shocks. If the BMS detects any of these, it shuts off the battery to protect it.

Although it seems expensive, this lithium-ion battery has a longer lifespan than most lead-acid batteries. The Battle Born battery comes with a ten-year warranty to guarantee its longevity. It is possibly the longest warranty one could get for solar batteries.


  • Very lightweight, perfect to use for boats and RVs.
  • It charges very fast.
  • Made of 100% renewable energy
  • Has a ten-year warranty
  • It has a built-in BMS that protects the battery, thus ensuring its long lifespan.
  • It can last for up to 3000 cycles.
  • It can last for hours and are very reliable.
  • It is easy to use and requires no maintenance.
  • It does not need temperature compensation when being charged.
  • The output voltage is high.


  • It is quite expensive
  • Some have reported that it only works best at 10V.
  • Some users claim that its internal cells are not of the best quality.

What Makes It Different:

The BMS is a groundbreaking technology that ensures the performance and longevity of your battery. Although it is quite pricey, this feature gives you great value for your money because you are assured that you will be able to use your hatter for at least ten years.

Battle Born LiFePO4 Deep Cycle Battery - 100Ah 12v with Built-In BMS -...
  • BUILT-IN BMS: BMS stands for "Battery Management System" - the brain of our deep cycle lithium...
  • LITHIUM ION TECHNOLOGY: Unlike Lead Acid batteries, Battle Born's deep cycle lithium ion batteries...

9. WindyNation


WindyNation’s battery is another AGM rechargeable battery that is specifically designed for off-grid systems. It can be used for RVs, offshore Marine power, portable power tools, and remote telecoms. It comes in a non-spillable case, making it perfect even for indoor use.

This BattaMax battery also has deep cycle performance allowing you to maximize its use even when the demand requires high bursts of energy. It does not discharge quickly and can last hundreds or even thousands of cycles before it has to be replaced.

It is composed of 99% virgin lead, which translates to a very low discharge rate. This gives you maximum power storage as compared to brands that use recycled lead. It promises 100 Amp-Hours at the 10-hour rating, and 110 Amp-Hours even at the 20-hour rating.

Because it only uses the best quality materials, this battery can last about 10 to 12 years when used correctly.


  • It is composed of virgin lead material, giving you a guaranteed long lifespan.
  • One cycle lasts long. It has a low discharge rate, thus eliminating the need to regularly charge.
  • It can last for hundreds of cycles.
  • It is excellent to use for off-grid systems.
  • It can power some pretty high energy-consuming appliances.


  • Some have reported the battery lasting for less than a year. It could be a manufacturing issue, or possibly a problem encountered during shipping.
  • The short hub terminals aren’t so great, but it’s not entirely useless.

What Makes It Different:

This is one of the best solar batteries to use for off-grid systems because of its 99% virgin lead component. Using new lead means lower discharge rates and longer life spans. This also gives you great value for your money because you can maximize your battery’s full potential.

WindyNation 100 amp-Hour 100AH 12V 12 Volt AGM Deep Cycle Sealed Lead Acid...
  • WindyNation 100 amp-hour, 12 Volt heavy duty deep cycle AGM sealed lead acid batteries with heavy...
  • Ideal for all types of off-grid power: Solar Systems, RV's, UPS, Off shore Marine power,...

10. Mighty Max Battery

Mighty Max Battery

The Mighty Max Battery is an AGM Battery replacement for solar systems. It requires no installation and maintenance. The chemicals are in a spill-proof battery case, which is strong enough to withstand any position it is placed in and can resist strong shocks and vibrations.

This is also a 12-voltage rechargeable battery that has a long service life of ten years. It also has a wide range of operating temperatures, which makes it very versatile to use for a variety of things like security systems, emergency lighting, motorcycles and power sports, lawn and garden tools, etc.

This battery also has a deep discharge, which makes it perfect to use for appliances that require long high current charges. It can also last up to several hours fully charged when using for one device at a time.

It also has a low self-discharge rate of only 3% per month. When not in use, the battery can be stored at 20°C for up to six months.


  • These are heavy batteries that come in spill-proof, shock-resistant cases.
  • The cycle lasts long as long as it only powers a few appliances at a time.
  • It has a slow discharge rate.
  • It has a long lifespan, averaging about ten years.
  • It can be used for a variety of systems.


  • When the temperature is too cold, it drains the battery very quickly.
  • For some appliances, it discharges the battery relatively fast.
  • The casing may not be as sturdy as other batteries, so it needs to be handled with care. If there is no damage, the casing is still spill-proof.

What Makes It Different:

This is a slow discharge battery. It will allow you to maximize its potential, whether it’s being used daily or sitting on the shelf for a while. Its 3% discharge rate per month guarantees that you will be able to use this product for a long time before it will have to be recharged or eventually replaced.

Mighty Max Battery 12V 200Ah 4D SLA AGM Battery Replacement for Solar...
  • ML4D SLA is a 12V 200AH Sealed Lead Acid (SLA) rechargeable maintenance free battery - UL Certified
  • Dimensions: 20.75 inches x 8.11 inches x 8.43 inches. Listing is for the Battery and Screws only. No...

11. QTY 2 Vmaxtanks Vmaxslr155

QTY 2 Vmaxtanks Vmaxslr155

Vmaxtanks battery is a high-quality AGM deep cycle battery. AGM or Absorbed Glass Mat is a lead-acid battery that delivers high currents on demand. It also has a relatively long life, even if it has a high depth of discharge. This battery is also typically maintenance-free and is very reliable.

The Vmaxslr155 is a 12 volt deep cycle rechargeable battery. It is made of military-grade custom-made plates, which guarantees that it will be able to resist harsh conditions and strong shocks.

It has an expected lifespan of about 10 to 12 years, depending on how it is used. The manufacturer also assures that it is designed for 99% recombination capabilities, which means that it recombines 99% of the oxygen and hydrogen and therefore does not emit fumes or gases.

This battery should not be discharged to maximize its full potential. It has to be charged regularly, especially when used by several appliances at a time.


  • It is easy to use and requires very little maintenance.
  • It has a low self-discharge rate.
  • It works well, and the battery’s cycle lasts long.
  • The batteries are heavy, which means the materials used are heavy duty as well.
  • It can run for about 8 hours on a full charge, and this can even extend when minimal appliances are used.


  • It cannot be allowed to discharge as it will directly affect the quality and lifespan of the battery.
  • Since it is a lead-acid battery, it could be very harmful to the environment if not handled properly.

What Makes It Different:

The battery’s case is made of military-grade custom-made plates. It is so heavy that it assures you that it will not be easily damaged. It keeps the chemicals safe inside and is resistant to tampering, harsh weather conditions, and shocks. This makes the battery extremely safe to use.

Qty 2 VMAX SLR155 Vmaxtanks AGM Deep Cycle Batteries 12V 155Ah Each SLA...
  • (2) 12V 155Ah AGM Deep Cycle Sealed High Performance Maintenance-Free Batteries for 12V, 24V, 36V,...
  • Military Grade custom made plates

12. NPPower NPD12 120Ah

NPPower NPD12 120Ah

NPP Power NPD 12 is a lead-acid battery made of high-quality materials. Not typical of a lead-acid battery, this brand has a deep cycle that can be used for several systems in the house.

Examples of which are emergency lighting, alarm system, telecommunication system, computer, standby power supply, solar panel system, fire prevention equipment, etc.

This NPP product is a 120Ah rechargeable deep cycle battery. This means that before it gets discharged, the battery allows you to use up most of its capacity, thus giving you optimum performance.

At 100% DoD, this battery can have up to 350 cycles. At 30% DoD, it can last to up to 1500 cycles. It has an average lifespan of about ten years, provided that it does not discharge regularly.

This battery is recommended to be operated at 25°C. It also comes with a two-year warranty, which is a pretty generous offer considering that most brands only offer a one-year warranty.


  • It is a deep cycle battery, which allows you to maximize its capacity.
  • At a high DoD, it can still give you up to 350 cycles.
  • Its warranty is two years, which is longer than the standard warranty given by other manufacturers.
  • It lasts long before getting discharged.
  • The life span is average at ten years.
  • The battery case is made of a non-conductive ABS plastic. It is resistant to shock, vibrations, chemicals, and harsh weather conditions. This makes it a safe product to use even inside the house.


  • It needs to be used with an adapter.
  • If the temperature goes above 25°C, the longevity of the battery is gravely affected.
  • It contains lead, which is harmful to the environment, especially if it is not disposed of properly.
  • It has very little reviews from users, so this may mean that not a lot of people are purchasing this product.

What Makes It Different:

This battery has a two-year warranty, which is a year longer than the standard warranty given by other manufacturers. This provision gives you a little bit more confidence in purchasing this item because you know that you can easily have it replaced should you encounter any problems with it.

NPPower NPD12-120Ah Rechargeable AGM Deep Cycle 12V 120Ah Battery with...
  • CERTIFICATION - ISO9001, ISO14001, CE, and UL Certified
  • BATTERY TYPE - 12V 120 Amp NPD12 120Ah Rechargeable AGM Deep Cycle Battery With Button Style...

Frequently Asked Questions

1. Which type of battery is best to use for solar systems?

There are three types of batteries you can choose from: lead-acid, lithium-ion, and saltwater. Lead-acid is the cheapest option of the three, but it is quite a handful due to its weight. They also have relatively shorter life spans and cycles. Lithium-ion batteries are more expensive compared to lead-acid, but they come in more lightweight and compact cases. They also have longer life spans and cycles. Saltwater is the newest innovation, but still lacks research to back up its effectivity. When you consider all of these factors, lithium-ion might be the best to use for solar systems, especially when used in the home.

2. Can I use deep cycle batteries for solar?

Yes! Because without deep cycle batteries, you will only be able to use power when the sun is up. Deep cycle batteries will help you save energy for your storage system.

3. Can you overcharge your batteries?

You mustn’t overcharge your batteries. Doing so will drastically shorten its lifespan. Overcharging will cause lead-acid to boil, which will eventually lead to external damage. It can even lead to an unnecessary explosion that will damage your property and hurt you.

4. How fast will a solar panel charge a battery?

A 12-volt solar panel system can charge a 12-volt battery in 5 to 8 hours, provided that it is a sunny day.

Best Solar Battery – Your pick?

A solar battery has become a great alternative to several individuals because of the benefits it presents. Although it may seem overwhelming at first because of the technicalities one needs to consider, the benefits usually outweigh all of these. So, like in any other investment, make sure to do your research, find the best product that will meet your needs, and handle your batteries with utmost care to ensure that you will get the most use out of it that’s possible.

Written by Carlos Huerta

Electrical Engineer with background in solar PV designs for residential and commercial projects as well as power systems development. Fan of renewable energy topics and projects. Technical writer for papers, articles and research in related topics to sustainability and especially solar power. Follow Carlos on LinkedIn.