Capacity range: 33Ah – 200Ah
Number of cycles (25°C) :
30%DOD – 1300 cycles
50%DOD – 700 cycles
100%DOD – 300 cycles
In AGM batteries, there is a thin ultra-fine fiberglass mat sandwiched between the plates that is saturated with battery acid to about 95% of what they can hold. This mat is then packed in between the plates and slightly compressed, then welded/soldered in place. Because the plates and mats are packed fairly tight, they are almost immune to vibration.
AGM technology became popular in the early 1980s as a sealed lead acid battery for military aircraft, vehicles and UPS to reduce weight and improve reliability. The sulfuric acid is absorbed by a very fine fiberglass mat, making the battery spill-proof. This enables shipment without hazardous material restrictions. It stands up well to low temperatures and has a low self-discharge. As to the safety, there is no need to worry about acid leaking or evaporating, and when excessive gas production by inappropriate charging occurs, safety valves will automatically emit the gas to prevent battery cracked, making this type of battery extremely safe.
AGM batteries have very low internal resistance, is capable to deliver high currents on demand and offers a relatively long service life, even when deep cycled.
The leading advantages of AGM are a charge that is up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified at 50 percent DoD to attain the same cycle life.
Due to the characteristics of “Maintenance Free”, “Deep Cycle”, “Low Self DIscharging” and “Great Price-Quality Ratio”, AGM VRLA Batteries have become the most popular way to store the energy in solar power applications.
In order to maximize the life of an AGM battery, it is important to follow the manufacturers charging specifications and the use of a voltage regulated charger is recommended. There is a direct correlation between the depth of discharge (DOD) and the cycle life of the battery. A good charger will automatically monitor and control these parameters to ensure a maximum battery life.
AGM batteries are maintenance free, provides good electrical reliability and is lighter than the flooded lead acid type. While regular lead acid batteries need a topping charge every six months to prevent the buildup of sulfation, AGM batteries are less prone to sulfation and can sit in storage for longer before a charge becomes necessary. The battery stands up well to low temperatures and has a low self-discharge. AGM and other sealed batteries do not like heat and should be installed away from the engine compartment.