Best Batteries For Solar Panels – A Simple Guide [2022]


The rapid advancement in the solar energy industry is introducing a lot of better and cheaper battery options to let individuals enjoy an eco-friendly way of energy consumption. But which battery is exactly the best for solar panels?

The overall best battery for solar panels, are lithium batteries.  Solar batteries are usually made of lithium-ion, lead-acid, or saltwater. When it comes to the best batteries for solar panels, products from each category have their own unique features and benefits. For instance, the ZJDU 48V 70Ah Lifepo4 Battery  lithium is overall the best off-grid lithium-ion solar battery for homes. When it comes to lead-acid batteries, both flooded and sealed lead-acid batteries are excellent for your solar panels. 

Batteries are of paramount importance when installing solar power systems in your factory or home. To enjoy the best of this renewable and eco-friendly energy source, especially when you live off-grid, you’ll have to rely on the best batteries available on the market. To determine the best products, you’ll need to understand their types first. So, let’s read till the end to find a concrete solution. 

Types of Solar Panel Batteries

When it comes to choosing solar batteries, there are quite a few options that you would come across. Here, we have presented a table with all the popular types, options, and their respective features. 

Battery TypeProduct ExamplesPower & Capacity Maintenance LifeSafetyPrice
Flood-Lead Acid Batteries6 X TROJAN T-105SmallNeeds Regular Maintenance Short LifespanMay emit harmful gasses if not maintained properly$150-$390
Absorbent Glass Matt BatteriesSEALAKE FM12170 BatteryAverageNeeds Maintenance Once/Twice a WeekModerate LifespanMay emit harmful gasses if not maintained properly$200-$300
Gel BatteriesRenogy 12V Deep Cycle Hybrid Gel BatteryAverageNeeds no Maintenance Moderate LifespanSafer than any other lead-acid solar battery$130-$250
Lithium BatteriesZJDU 48V 70Ah Lifepo4Largest & BestMinimal/No MaintenanceLongest LifespanLittle to no chances of fire$6000-$9000
Saltwater BatteriesFishingJoy Electric Reel Battery Sun PowerLargeMinimal/No MaintenanceLong LifespanCompletely safe and no major concerns$2500-$8000

Flooded Lead-Acid Batteries

Over the last 150 years, humankind has been dependent on the Flooded Lead-Acid (FLA) solar batteries to run the solar panels. One of the most common choices for off-grid solar panels, they are really inexpensive, easily disposable, and 99% recyclable. 

These solar batteries are undoubtedly a budget-friendly option if you’re on a tight budget. Check what you need to know about these batteries:

  • Flooded lead-acid batteries are made to look after your solar panel’s daily charge cycling. They need proper ventilation as they tend to emit gasses as a byproduct. 
  • If you want to be hands-on with your solar panel system, these batteries are ideal for you. They’re highly affordable and require regular maintenance for proper functioning. 

Absorbent Glass Mat (AGM) Batteries

Introduced in the early 1980s, the AGM batteries started to gain popularity when their technology was appreciated and used by military aircraft, vehicles, and UPS. These AGM batteries are a segment of sealed lead-acid batteries. 

These batteries use a fiberglass mat for electrolyte absorption. You’llYou’ll find the plates either coiled into a spiral shape like those in Optima batteries or flat like those in flooded lead acid. 

One significant benefit of using these batteries is that their internal resistance is lower than that of flooded lead-acid batteries. It helps the AGM batteries to handle higher temperatures while discharging energy slowly, more than the other batteries. 

The cells present in the AGM batteries are all leak-proof, and they need little to no ventilation. However, they utilize a charging voltage similar to the one used on flooded batteries. They are highly compatible with most solar panel systems. 

Other benefits of utilizing AGM batteries are that they are non-toxic, lightweight, and impervious to cold temperatures. They tend to be less vulnerable to heating due to their low internal resistance. What’sWhat’s more, they save and conserve a lot of static charge for more extended periods. 

Although a bit expensive, they are an excellent choice for your off-grid solar panels. 

Gel Solar Batteries

This is yet another type of sealed lead-acid battery. When it comes to deep-cycle applications, these batteries stand out as the best ones. They utilize fumed silica to make the battery cells stronger and sturdier. They ensure durability, require no maintenance, and are highly resistant to shock and vibrations. 

With a great lifespan, these batteries work efficiently in both cold and hot temperatures. Moreover, they are less susceptible to leakage during damage due to their viscous electrolyte. However, if you look at the cons, gel batteries have more than other battery types. Maybe that’s why they are not so popular. These ventless batteries tend to self-discharge energy quicker than flooded battery cells. 

Apart from lacking amp-hour capacity and having narrow charging profiles, they are a bit costlier than flooded batteries. 

Lithium-Ion Batteries

When it comes to the best batteries for solar panels, you can easily go with the products made of lithium-ion. Lithium batteries are the most popular and highly preferred solar batteries in the world. Thanks to its prismatic form, you’ll enjoy optimal ventilation and other beneficial use in solar panels. 

These batteries have a two-stage response to charging (unlike the conventional three), and they come with an extraordinary voltage range. A voltage regulator charge controller is all you need to charge them. Despite having a low self-discharge, you won’t get much out of long charging. 

This solar battery type doesn’t need much maintenance and has a long lifespan. They are more expensive than lead-acid batteries. Also, to regulate the voltage and current, you may need a protection circuit. 

Typically, you can enjoy more cycles with lithium-ion batteries than the lead-acid ones. These lithium batteries are excellent for delivering ancillary services to your solar panel grid. Also, the high charge and discharge efficiencies make them a popular energy-saving option for solar panels.

Saltwater Batteries

Saltwater batteries for solar panels are expensive yet highly beneficial. These batteries produce power by utilizing salt. They produce non-hazardous, long-term power and stand out as a completely safe option available in the market. Unlike lithium batteries, you can drain these saltwater batteries. 

When it comes to safety, you should undoubtedly choose saltwater batteries. Apart from excluding harmful chemicals that can be found in lead-acid batteries, they can be used at a more comprehensive temperature range. Also, they impose no risk of fire due to their safe chemical composition. 

Although these 100% recyclable batteries are not as costly as lithium-ion batteries, they are more expensive than lead-acid batteries. Also, compared to lithium batteries, they offer less power and capacity. Conclusively, they are an ideal choice in terms of safety, overall efficiency, and durability. 

Solar Panel Battery Types and Their Special Features

ZJDU 48V 70Ah Lifepo4 – Best Lithium-Ion Solar Battery

ZJDU 48V 70Ah Lifepo4 Battery,10+ Years Lifetime,Deep Cycle Lithium Iron Phosphate Rechargeable Battery,for Golf Cart EV RV Solar Energy Storage Battery
  • Longer Lifetime & Longer Warranty:Built with LiFePO4 battery cells that are engineered to deliver superior performance, Excellent Drop in replacement for AGM Sealed Lead Acid Battery. Last 8 to 10 times longer than standard lead acid batteries. Our products have a 10 years service life.
  • LiFePO4 Battery Advantages: Lithium iron phosphate battery has a series of unique advantages such as high working voltage, high energy density, long cycle life, low self-discharge rate, no memory effect, and green environmental protection. It also has a stable charging and discharging platform, and will not burn and explode, even in short circuits. It is still very safe under special conditions such as overcharging, squeezing and acupuncture.
  • Built-In Smart :Our LiFePO4 battery has built-in (Battery Management System) to protect it from overcharge, over-discharge, over-current, and short circuit with excellent self-discharge rate. Built-in temperature protection function, cuts off charging below -4℉(-20°C),high temp cut off prevents charging over 158℉(70℃).
  • How To Charge:The positive and negative poles on the battery can discharge and charge the battery. LiFePO4 battery's flat discharge curve holds above 48V for up to 90% of its capacity usage providing astronomical boosts in run-time compared to only 50% in Lead Acid.
  • Widely Applications:50% lighter than lead acid battery of the same capacity, And there is no memory effect, no matter what state the battery is in, it can be used as soon as it is charged. Ideal for 48V deep cycle applications in Caravans, Camper Trailers, Medical Devices, Motorhomes & Electric Mobility Scooter.

Do you have off-grid solar panels at home? If so, you’ll need a battery that can continually supply power on a regular basis. Here, lithium-ion solar batteries will be the best solution. And one of the best lithium batteries for solar panels is the ZJDU 48V 70Ah Lifepo4 lithium battery. The average price of this lithium battery is $3661, which is subject to change depending on the demand and supply. 

Whether it’s affordability, energy efficiency, or long lifespan, this battery takes care of all. Factors that make this battery so special include the following: 

  • This lithium battery from Discover is a premium option for your solar panels. 
  • It charges faster than any other battery type and ensures a long lifespan. 
  • Also, you’ll require less overall capacity with this battery as they can operate deep discharges. 
  • This battery also makes things easier while expanding your solar panel system over time. 
  • Every battery has its separate internal Battery Management System (BMS), enabling you to add more batteries over time. 
  • It ensures energy efficiency by running for an extended period without getting recharged. 

6 X TROJAN T-105 – Best Flooded Lead-Acid Battery For Homes

6 X TROJAN T-105 PLUS 6V 225 Ah. DEEP CYCLE FLOODED
  • Special Delivery Note: These golf cart / industrial batteries will arrive on a pallet via truck freight (semi-trucks) not common carrier like UPS. ALL deliveries require an appointment, especially residential. Someone must be present to sign for delivery.
  • Please make sure your contact email and phone number registered with your Amazon account is current. The carrier will try scheduling the appointment for 2-3 days. If they are unable to connect with you the pallet will be returned and considered REFUSED by the recipient. In this scenario, ALL freight and re-consignment charges will be deducted from the return. Depending on location that is $265-$400. The shipper/seller cannot be responsible for these charges.

Are you looking for a budget-friendly option while buying a solar battery? Take no worries as the 6 X Trojan T-105 – the best flooded lead-acid battery is affordable and beneficial. You can go with this battery if: 

  • You have off-grid solar panels at home or some other place. 
  • This battery is an ideal choice if you’re not reluctant to do occasional maintenance, tune-up, and hands-on DIY projects. 
  • You want reliability and power capacity at a budget-friendly price. 
  • It’s next to impossible to find a solar battery with 220 amp-hour capacity like this at a reasonable price. 

SEALAKE FM12170 Battery – Best For small projects or Temporary Needs

Sale
SEALAKE FM12170 Battery - Replacement UB12180 Universal Sealed Lead Acid Battery (12V, 18Ah, 18000mAh, T4 Terminal, AGM, SLA) - Also Replaces APC Smart UPS 1500, Smart-UPS 3000, RBC7, RBC43, SUA1500
  • Replacement SEALAKE FM12170 Battery
  • Replacement for UB12180 Universal Sealed Lead Acid Batteries
  • One Year Warranty
  • Capacity: 18Ah, 18000mAh, T4 Terminal, Upstart Battery Brand
  • Note: Not compatible with the APC Smart-UPS 1500VA LCD RM 2U 120V system

Are you looking for a battery that won’t require regular maintenance? Do you need it for your cabin with off-grid solar panels? If so, take a look at the SEALAKE FM12170 battery

WhetherWhether you visit the place once or twice a year, this sealed lead-acid AGM battery will take care of the maintenance and durability. At an affordable price between $40 and $100, this is the ultimate choice for you. 

  • It comes with a low power capacity, which is good as you won’t require year-round storage. 
  • This battery is comparatively inexpensive than other battery types. 
  • It’sIt’s ideal to invest in properties where you won’t spend much time in a year. 

Best Batteries For RV, Remote Industrial, Marine & Small Off-Grid Solar Panels

There can be situations where you’ll need batteries for solar panels on small applications like a small outbuilding or a boat, or an RV. So, the best batteries for such small off-grid solar panels include: 

  • Crown 6C 220: if you want to use solar batteries for light-use purposes, then Crown 6C 220 AGM battery is an ideal choice. This battery was initially made to power golf carts. Although it has a shallow profile, it managed to withstand deep cycles for a long lifespan. It’sIt’s advisable for boats, tiny homes, and RVs. 
  • FishingJoy Electric Reel Battery Sun Power: When it comes to best saltwater applications, you can rely on this battery. They are the ideal solar battery option in terms of safety, durability, recyclability, free maintenance charges, and environmental friendliness. This new solar battery provides exceptional energy storage opportunities.

Battery For Solar Panels: Which Is The Ideal One?

It’sIt’s really difficult to answer. The best battery for solar panels depends on numerous factors like what you expect from the battery, the characteristics of the solar installation, and the size of your home. 

For instance, if your home is large with multiple appliances, you’ll need a battery with a high power capacity that can supply electricity for hours. 

However, if you want to optimize your solar panel system with a budget-friendly option, you can choose a small battery with excellent integration. If you have to pick anyone, all-in-all, go with the lithium batteries like the ZJDU 48V 70Ah Lifepo4 Battery. 

Conclusion: Best Battery For Solar Panels

From this comprehensive guide, you must have got an insight into everything about the best batteries for solar panels to help you choose the best one. 

So, look out for these categories and products, determine what suits your needs, and pick one for yourself. Let the power of renewable sources of energy brighten up your home and save mother Earth!

Frequently Asked Questions –

How Can I Choose the Best Batteries for Solar Panels?

Although there are plenty of benefits of having a battery system for your solar panels, there are various challenges in determining the right one too. As they tend to be costly and difficult to replace after the solar panel installation, it becomes more vital to pick the right one. 

With so many types of solar batteries available in the market, you may find it a daunting task to differentiate between them all. However, you can do it. You’llYou’ll have to choose the best one by considering factors like ease of installation, cost, battery lifespan, storage capacity, and so on. 

How Do Batteries For Solar Panels Function?

The batteries for solar panels function by generating energy from the solar panels and storing it for later use. They conserve the stored energy in the form of DC energy. Thus, you may need a power inverter for the conversion of this DC energy into AC energy. 

Typically, you will need either 230V or 120V for use at home. Also, you’ll need a solar charge controller, which is another essential part of solar batteries. This controller helps to protect the batteries from getting overcharged by the energy generated during the day. Moreover, it helps you prevent the stored energy from going back to the panels. 

Can I Charge My Lithium Battery with Solar Panels?

Yes, you can charge your lithium battery with solar panels. However, you must know that regular charging of the lithium batteries would result in damage due to the charge response. Most solar batteries get charged in three stages – float, acceptance, and bulk. 

Meanwhile, lithium batteries get charged only in two stages. If you perform store charging on lithium batteries, it will boost discharge, threaten the battery life, and destroy the battery. 

Which is the Best Battery Type for Occasional Maintenance?

If you cannot maintain and check your battery regularly, then the best batteries for your solar panels would be the sealed lead-acid battery type. Among the two types of sealed batteries, the AGM batteries are the most popular and preferred one. They need no maintenance and are non-hazardous and leak-proof. 

David Binion

Hi, I am David Binion, I am a technical assistant of a solar panel manufacturing company. I also have a solar panel selling and service providing shops beside my job. Because of my job & business, I have to face so many clients of the power tool users.

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