What Does Low Impedance Fence Charger Mean?

In simple terms, low impedance refers to the level of resistance or impedance within the charger itself. The lower the impedance, the easier it’s for power to flow through the wire, ensuring a stronger and more reliable electric fence. This enhanced power transmission is especially crucial in areas that are prone to weed growth, as dense vegetation can often impede the electricity's flow. By utilizing a low impedance fence charger, farmers and property owners can rest assured knowing that their electric fences will remain operational even in weed-infested environments.

What Is the Difference Between Low Impedance and High Impedance Electric Fence?

Low impedance chargers are designed to deliver a powerful and effective shock to any potential intruders, such as animals or humans, that come into contact with the electric fence. They’ve the ability to energize several miles of single or multiple-wire fences, making them highly suitable for large-scale agricultural or livestock applications. These chargers utilize a short-duration, high voltage DC current to ensure quick and efficient transmission of the electric pulse along the fence line.

Their high-voltage, short-duration pulses ensure that the potential intruders receive a powerful shock, effectively deterring them from attempting to breach the fence.

In contrast, high impedance systems, commonly referred to as 25V, 70V, or 100V, are typically used in larger installations such as stadiums, airport terminals, and shopping malls. These systems allow for longer cable runs and can power multiple speakers without significant loss of audio quality. However, it’s important to note that high impedance systems may require additional equipment, such as transformers, to match the impedance of the speakers.

Is Low Impedance Good or Bad?

Low impedance is generally considered to be good in most applications. It refers to a system that’s a lower resistance, allowing for more efficient and higher quality performance. In the context of sound systems, low impedance is ideal for high-performance applications where a powerful and clear sound output is desired.

For example, high-powered speakers often require low impedance for optimal performance. This is because low impedance systems can handle more power and deliver a more accurate reproduction of sound. Similarly, in short cable runs, low impedance is preferred as it minimizes signal loss and ensures better signal integrity.

These environments require high-quality sound reproduction to create an enjoyable and immersive experience for the patrons. Furthermore, houses of worship often have low impedance sound systems to amplify prayers, sermons, and performances.

On the other hand, high impedance refers to systems that operate at 25V, 70V, or 100V. These systems are often referred to as 70V systems. High impedance systems are typically used in situations where long cable runs are necessary, such as large-scale commercial installations or public address systems in stadiums.

It allows for efficient power distribution, clear sound reproduction, and minimizes signal loss.

When it comes to determining the strength of an electric fence charger, there’s a general rule that can help guide your selection. For multi-wire fences, you should divide the charger’s distance rating by the number of strands and choose a charger with a mileage rating that meets those needs. It’s important to note that as you add additional wires, you should also increase power needs.

How Strong of an Electric Fence Charger Do I Need?

When it comes to selecting an electric fence charger, one of the factors to consider is the strength of the charger. A general rule of thumb for multi-wire fences is to divide the chargers distance rating by the number of strands on the fence. This will give you a rough estimate of the mileage rating you should be looking for in a charger.

For example, if your fence has four strands, and the charger has a distance rating of 20 miles, you’d divide 20 by 4 to get a required mileage rating of 5 miles.

Low impedance fence chargers are often preferred for their ability to deliver a powerful and consistent electric charge along the fence. This means that the charger will have a lower internal resistance, resulting in a stronger shock to deter animals from touching or crossing the fence. This is especially important if you’ve larger or more determined animals that may require a stronger shock to stay away from the fence.

By selecting the right charger for your fence, you can ensure that it’s adequately powered to effectively contain your livestock.

Types of Electric Fence Chargers

There are different types of electric fence chargers available in the market, and one of them is a low impedance fence charger. A low impedance fence charger refers to the type of charger that delivers a strong and consistent electric current to the fence. This type of charger is designed to maintain a high voltage output even when the fence is in contact with vegetation or other objects.

Low impedance chargers are typically used for larger fence systems, such as those found in farms or agricultural settings. They’re known for their ability to provide a powerful shock, making them highly effective in deterring animals from coming near or trying to breach the fence.

In addition to a high voltage output, low impedance fence chargers also offer features like surge protection and energy-saving modes. Surge protection helps protect the charger from damage caused by voltage spikes, while energy-saving modes allow the charger to operate more efficiently, reducing power consumption.

When choosing a low impedance fence charger, it’s important to consider factors such as the size of the fence, the type of animals being contained, and the power source available. This will help ensure that you select the appropriate charger to meet your specific needs and effectively secure your property.

Source: Find the Best Electric Fence Charger – Zareba Systems


This advancement is particularly beneficial for land with dense vegetation, as it ensures a consistent and effective electric fence performance. By embracing low-impedance chargers, landowners can confidently protect their property from potential breaches, confidently navigate through dense foliage, and maintain the utmost security and safety for their livestock.

Scroll to Top