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What Is an AGM Battery for Solar

While commonly used for automobiles, AGM batteries for solar are slowly gaining popularity as a viable option for solar power setups. But what are AGM batteries, how do they function, and are AGM batteries good for solar power alternatives? We’ll answer all that and more in this article, so sit back and take notes as we discuss AGM batteries.

How Do AGM Batteries Work?

Let’s start by addressing the most crucial question: what does AGM battery mean, and what are AGM batteries made of? AGM battery stands for Absorbent Glass Mat battery and uses pieces of fiberglass mesh to separate the positive and negative plates within the battery. The mats allow the electrolyte solution to spread better on the lead plates and protect the internal setup from damage caused by knocks, shocks, and vibrations.

A garden/home solar cell panel installation

As for functionality, the AGM solar battery works similarly to most valve-regulated lead-acid batteries but with a unique twist. The ultra-thin fiberglass mesh mats absorb the electrolyte solution within the battery, keeping it in a motionless form. This maximizes the contact between the lead plates and electrolytes, resulting in better energy discharge and output.

AGM Battery Advantages

After understanding how it works, let’s talk about one of the important points before buying one for any power alternative setup: the pros and cons of AGM batteries. This section will focus on AGM battery advantages and answer the question, ‘Are AGM batteries worth it?’

Higher Voltage Output

Looking for a battery that offers more electrical energy? AGM batteries are the best option in the market. In addition, it can generate short bursts of power to start up cars and other machines.

Low Self-Discharge Rate

AGM batteries have a low self-discharge rate, allowing the battery to be stored for extended periods before needing a recharge.

No Spills

With the electrolyte solutions absorbed within the fiberglass mats, there’s minimal chance of the solution spilling from the battery. Plus, they’re safe to transport, including no hazardous materials or chemicals.

High Durability

AGM batteries are designed to withstand constant vibration and motion, making them great additions to mobile vehicles like RVs and boats.

Easy to Install and Maintain

Setting up AGM batteries is relatively easy; they can be installed in any orientation without issues. They can also be installed in less ventilated areas as they produce minimal gas emissions.

Cold Temperature Tolerance

Another advantage of AGM batteries is their better tolerance to colder temperatures than wet-cell batteries. The battery won’t be damaged even if the solution is frozen due to low temperatures.

Longer Service Life

With proper maintenance, AGM batteries can last two to three times longer than traditional flooded variants, making them a cost-effective power storage solution.

Disadvantages of AGM Batteries

After looking at the advantages of AGM battery for solar, it’s time to look at the other end of the spectrum: what is the main disadvantage of an AGM battery? A solar AGM battery has its set of disadvantages that suppliers and end-users need to consider before buying.

Higher Cost

AGM battery cost for sourcing raw materials and manufacturing are higher compared to other lead-acid batteries. As such, they tend to be more expensive.

Sensitive Charging Requirements

While some batteries can work on an 80% charge, one of the disadvantages of AGM batteries is that they require a full charge to perform efficiently. Plus, it’s susceptible to overcharging and high voltages, so end-users need to monitor the battery while charging.

Needs Its Own Charger

Due to its unique setup, you can’t charge AGM battery with a normal charger and will need a dedicated charger.

Inaccurate Testing Results

Another one of AGM battery disadvantages is that results may not be accurate when tested with older battery testers.

Solar AGM Battery Applications

Man wearing gloves installing a solar panel

With its unique features and exceptional dependability, AGM technology batteries can be used in various applications.

The first of these applications is for activating vehicle engines in cars, RVs, and trucks. AGM batteries can double as SLI or Starting, Lighting, and Ignition batteries, producing short bursts of energy for this purpose.

AGM batteries can also work for deep-cycle applications, producing minimal electricity in stable intervals. They are seen powering up golf carts, floor scrubbers, and other machines that require low and consistent energy to function.

Additionally, they complement alternative power setups in traditional homes. AGM batteries can provide power for home appliances like lighting, refrigerators, and air conditioning. And with their relative stability, you’ll see them as reliable power sources in boats and mobile homes.

How to Charge an AGM Battery

Charging an AGM battery is handled the same way as charging a typical acid-lead battery, with a few additional steps. Remember to follow the steps provided on your AGM battery charger to ensure the charging process goes smoothly and safely. Moreover, end-users need to monitor the charging and pull the charger out once the AGM is 100% to avoid overcharging, which can negatively affect its performance.

For anyone asking if charging an AGM battery with a standard charger is possible, the simple answer is no. A solar AGM battery needs a slower, more stable charge than other lead-acid battery types, hence the need for a specific charger to properly restore it to full capacity.

AGM Battery VS Standard Battery

Shopping for a battery for an alternative power setup can be a challenge, with multiple varieties available from reputable manufacturers. But why should you choose AGM batteries over standard battery options or a gel battery? Besides the distinct advantages solar AGM battery offers, as stated in a previous section, there are several differences between AGM and regular battery.

The absorbent fiberglass mesh on the AGM battery makes it stand out from regular batteries. Why, you ask? It’s because these thin sheets optimize the battery in several ways, namely:

Better Spreading of Electrolytes

Instead of the electrolyte solution flowing loosely on the battery, the fiberglass mats soak them up like sponges. This reduces the risk of the electrolytes spilling and makes the battery more durable.

Low Internal Resistance

The electrolytes trapped within the mats shorten the electrical current’s travel time, resulting in better and more reliable power output.

Protects the Lead Plates

In addition to facilitating electrolyte distribution, the fiberglass mats act as protective barriers for the positive and negative lead plates, keeping them safe from shocks and vibrations.

Along with these outstanding features, AGM also beats standard batteries, specifically:

  • More cycle times
  • Faster recharge times
  • Longer service lifespan
  • Better durability


Now you’re equipped with all the important information regarding AGM battery solar. Knowing what are AGM batteries used for gives you everything needed to make the right call for choosing them as your solar battery solution. Absorbent Glass Mat batteries lead the pack in terms of power, safety, and dependability.

For reliable and affordable AGM batteries for your solar power setups, look no further than BLJ Solar. With over a decade of manufacturing expertise and robust R&D capabilities, we develop world-class AGM batteries that exceed global quality standards. Contact us today to request a free quote.

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