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The 4 Best Deep Cycle Batteries for Solar Energy Storage 

 September 19, 2021

By  Phil Borges

Solar energy is becoming more and more popular for powering homes, but how can you store the energy? The answer is deep-cycle batteries.

These are durable, long-lasting power sources that won't let you down when you need them most. There are many deep-cycle batteries for storing solar energy on the market today.

It can be difficult to know which deep cycle battery is best for you and your home, so we have done all of the work for you!

Here are our top four deep cycle batteries so you can make an informed decision when shopping for your next battery purchase!

Types of Batteries for Your Solar System

Batteries are an important part of any solar system, but they can be confusing. When it comes to solar power, one of the most common questions asked is what type of battery should be used.

There are many types available in the market and they vary greatly in terms of price, specifications, quality, and their own distinct advantages and disadvantages. 

Lithium-Ion Batteries

Lithium-ion batteries are one of the newest battery technologies available and they have taken the market by storm. These types of batteries provide a high amp-hour capacity, relative lightweight build, and long lifespan. They also charge quickly which is important in solar energy use as you want to be able to move your power around at will.

When it comes to durability, efficiency, and cost-effectiveness in solar power systems for large buildings like warehouses or factories, lithium-ion batteries are just about the best thing going.

Lithium-ion batteries are known for their high performance and efficiency. They have a long lifespan, are stable, and are safe to use without needing much maintenance at all.

Another perk is the cost as they tend to be four times more expensive than other solar battery types but when considering how well it performs in many cases, it's worth spending that little bit of extra cash on them!

Sealed Lead-Acid Batteries

These are the most common type of batteries out there and they provide a strong amount of power in solar energy storage options. These batteries are known for being incredibly durable, providing a long runtime with minimal maintenance needed before they need replacing.

They are quite inexpensive to purchase making them affordable for almost any budget! They are also easy to charge and maintain.

These batteries come in a variety of sizes, shapes, and are made for various purposes. They have a strong cycle life and are well-suited for use with solar energy systems but they aren't the best option when it comes to maintaining the power even after it's been stored.

They don't self-discharge if stored away from a power source either so these batteries are great to use at remote locations like hunting lodges or campsites that only get occasional visits.

They’re spill-proof and nonhazardous which means they're perfect for people who won't be around to check up on their devices regularly.

AGM Batteries

These are a type of lead-acid battery. The difference between an AGM and other types is the liquid electrolyte.

Rather than being mixed in with the rest of the components, it's suspended in a nonreactive gel polyethylene which means less maintenance is required to keep them in proper working order, making them great for long-term solar energy storage.

The lifespan of AGM batteries is around 5 to 9 years depending on how they've been used and the type of charging applied.  

The more you discharge them, the shorter their lifespan becomes which means if you use these batteries for a solar battery bank, make sure that they have some power available at all times for charging as it will help to lengthen the lifespan significantly.

Flooded Lead Acid Batteries

These are the oldest type of lead-acid batteries still in use today and they require the most maintenance out of any other battery type.

These batteries have a strong power output that is still very important today but they need to be frequently topped off with distilled water to ensure that corrosion doesn't build up on the bottom.

They also need to be checked on at least once a month to make sure that none of the acids has leaked out and that they're still in working order.

All batteries are going to either slowly lose their power or deteriorate over time and maintenance is key to getting the most life out of your batteries when you use them for solar energy storage purposes.

These batteries are perfect for people who want to have complete control over their solar power systems. They're less expensive than lithium-ion, but you'll need to pay more attention and maintain them regularly.

Gel Batteries

These batteries are similar to AGM batteries but they're not the same by any means. These come in a traditional lead-acid format but the electrolyte is suspended in gelled liquid which gives them a longer shelf life than other types of solar battery storage options.

They also have excellent charge acceptance and discharge rates as well as being resistant to high temperatures which means that they're a great option for long-term storage of solar energy. They also can be left dormant for years without being charged or maintained

Like AGM batteries, you'll need to make sure that they get enough power through charging to keep them going strong over the years but this isn't much of an issue if you make sure to have a solar charge controller that has proper hookup capabilities.

How Much Batteries Do You Need for Your Solar Panel?

Now you know what types of batteries are available, how much power they can hold, and which ones are best for different circumstances.

Next, you need to figure out how many batteries you'll need to have enough storage capacity for your solar panels.

Some people who use solar panels at home have larger battery banks and can run more than just the bare essentials during an emergency power outage. A good rule of thumb is to buy enough solar batteries for at least a week's worth of charging to keep your solar panels going strong without any problems.

The number you need can vary greatly depending on what you want to have powered and how much wattage your solar panels will produce.

A safe estimate for most people in areas that average about 1000 watts per year would be 20-30 batteries, although this may be too many for some.

How does this work?

Solar batteries work by storing up the energy generated during daylight hours, converting it into DC power. This means they need a converter to turn this form of electricity from solar panels back into AC for use in electronic devices and other things that require an outlet.

At home, you generally use either 120V or 230V. You will also need a solar charge controller to ensure the energy that is produced by your panels doesn’t overcharge your batteries and keep them from running out overnight when they are not being charged with daylight.

Battery Life Span

If you take care of your batteries then they can last a long time. A good way to maximize their life span is by charging them regularly so that the power stored stays as strong as possible throughout the years. It's also important to be careful about how deep you discharge them so that they don't get damaged over time through repeated use.

Solar power systems require batteries to store the electricity and these are rechargeable. The lifespan of a battery depends on how often it is being recharged: if you’re planning on using your system only when there's ample sun, then expect each charge to last between 5-15 years; but more typically they'll need charging at least once during its lifetime which will be 20-30 years

Factors that affect the longevity of batteries for solar panels:

  • After a long day in the sun, solar batteries can be drained and need to recharge before they will work again.
  • The type of battery you get determines how often it needs to charge up after use as well as what kind of overcharging protection it has from getting too hot or cold.
  • Solar batteries are not at all self-sustaining. They require regular maintenance to remain operational, and the type of work that needs to be done on them varies depending on how long they have been in use.

Choosing the Right Solar Battery for Your Needs

Choosing the right solar battery for your needs is not a decision that should be taken lightly. There are many factors to consider, and you want to make sure you get it right the first time so you don't have to spend more money in the future.

You may want to consider the battery capacity, installation, charging time, budget, and battery lifespan.

4 Best Solar Batteries - Reviews

We all want to know what solar battery is best for us. It can be hard to find a good one, but we have done the research and found 4 of the best!

These are all high-quality batteries that will do a great job of powering your home or business when you need them most.

We'll go over each one below so you can decide which is right for you.

1. Renogy Smart Lithium Iron Phosphate Battery

Top Feature/s:

Type of battery: Lithium-ion

Life span: 2000+ cycles

Voltage: 12V

Amp hours: 100Ah

Advantage/s:

  • Renogy is one of the leading brands in solar power, and this battery is a great choice for anyone looking to store up some extra energy.
  • The lithium iron phosphate used in these batteries means that they are lightweight, have an incredible lifespan, and charge quickly.
  • It's also extremely safe and will not catch fire like many other batteries.
  • This battery is built for the long haul. Not only does it have a protection system against over-charging, but also high temps and short-circuiting too.

Disadvantage/s:

  • The big catch with this battery pack is that it's expensive. It will outlast the competition, but not everyone can afford to find that out for themselves first-hand.

Our recommendation/s:

This battery is the ultimate choice for deep-pocketed solar energy enthusiasts. In terms of safety, customer satisfaction, and lifespan this model reigns supreme in its class.

However, it comes with a hefty price tag which means you'll need to be careful about how much value you get per dollar spent on your purchase decision here.

As an investment, we feel that's worth every penny but if cost tops out as being the deciding factor then perhaps another product may better suit your needs--just make sure they're certified safe too!

2. WindyNation AGM Sealed Lead Acid Battery

Top Feature/s:

Type of battery: Lead-Acid AGM (Sealed)

Life span: 10-12 years

Voltage: 12V

Amp hours: 100Ah

Advantage/s:

  • This durable battery is perfect for long-lasting power and high capacity. It lasts up to 10 years in most applications, making it a great option year-round.
  • The heavy-duty plates have been designed for deep, repetitive charges and will last up to 12 years with low energy use. They’re perfect for RVing off the grid or living long-term offshore marine life.

Disadvantage/s:

  • This battery, though very dependable and long-lasting for low-level usage only, is not the best option if you need a power source that will last throughout hours of high energy use.

Our recommendation/s:

This is the battery for you if you need a low-power, affordable option. If your energy needs are short-term or minimalistic then this is perfect because it requires little maintenance and will keep on powering through as long as needed.

It comes from an extremely reliable manufacturer that's sure to offer their customers great service with any problems arising so they can get back up and running in no time.

3. Vmax Tanks VMAXSLR125 AGM Deep Cycle Battery

Top Feature/s:

Type of battery: AGM

Life span: 8-10 years

Voltage: 12V

Amp hours: 125Ah

Advantage/s:

  • VMAXSLR125 AGM batteries are the perfect choice for any situation where an awkward angle or a side-mounted battery is required.
  • Along with being great performers, these high-quality AGMs offer 8 to 10 years of lifespan and have been specifically designed for use in solar and wind energy applications.
  • It is a military-grade battery. The plates are custom-made and the quality of this item will not disappoint you at all.
  • The technology is a great fit with solar-powered panels and wind turbines, for backup power or running small buildings like hotels.

Disadvantage/s:

Our recommendation/s:

Do you need a deep-cycle battery that can withstand an awkward position? This one is the best option for solar backup, as it will have fully submerged plates and last longer. It’s made from high-quality materials and has great longevity.

4. Universal Power Group AGM SLA Deep Cycle VRLA Battery

Top Feature/s:

Type of battery: Lead-Acid AGM (Sealed)

Life span: 6 years or 500 cycles

Voltage: 12V, 24V, or 48V

Amp hours: 100Ah

Advantage/s:

  • You’ll love this battery! It comes from a trusted brand and is super low maintenance. You might not even have to do any upkeep with it – depending on what you use it for.
  • This solar panel is specifically designed to work well with both wind and solar energy systems. It's also cheaper than much of the competition, but still worth every penny!

Disadvantage/s:

  • There were complaints about the battery life, though this is not necessarily alarming. Some have reported it as arriving only half-charged or even fully discharged which isn't great news.

Our recommendation/s:

If you're tired of the hassle and expense that comes with most batteries, this is a great option.

The battery is so versatile, you can install it at any angle and in any position without fear of the plates running into trouble. For people who don’t want to worry about their batteries getting dirty or requiring maintenance, this would be an excellent option.

Conclusion

As you can see, there are a lot of things to consider when choosing the best deep cycle batteries for solar energy.

We hope that our guide and the reviews above have helped you make an informed decision about which battery is right for your needs. 

About the author

Hi, I'm Phil Borges.. thanks for reading.. My wife says I can't shut up about batteries so to save my marriage I've started this blog .. where I'd be ranting about batteries! Please leave a comment if you have any questions, I'm happy to help!

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