Veise (Guangzhou) Electronics Co., Ltd.

Model Number：EF-A1A030
Load Storage Energy Output: 3 Joules @ 500 Ω
Peak Storage Pulse Voltage Output: 11KV
Load Pulse Voltage Output: 4.8 KV @ 500 Ω
Power Source: AC 110V(220V Optional)
Powers Multi-Wire Distance Rating:
No Vegetation: Up to 65 miles
Average Vegetation: Up to 30 miles
High Vegetation: Up to 20 miles
Shell Material: Polyac-Black
Dimensions: 5" x 8-1/2" x 11"
Weight: 3 lb
Package Quantity: 1
Package Type: Box
Suitable to Control: Poultry, Fowl, Cattle, Horses, Pigs, Sheep, Goats, Rabbits 

AC Electric Fence Energizer

Low Impedance versus Ultra Low Impedance 
Some fence chargers include a low impedance technology while fence chargers are also available with Ultra low impedance technology. Low impedance is the ability of the electric fence   energizer to continually deliver effective shock sensations even through a small amount of vegetation or weeds that are in contact with the fence wire. The electric fence chargers are designed to use Ultra low impedance technology, which means the fence energizers automatically adjust the electric signal, keeping it strong enough to contain your cows, cattle and other livestock even in difficult fence conditions. Our models perform under “real life” conditions; weather soaked ground and over grown weeds won’t impede their performance. 
Most farmers and ranchers don’t want the added responsibility of monitoring the expanse of their fenced pasture areas every day and trimming back weeds to ensure their electric fence continues working. Ultra low impedance technology means that your fence charger will continue providing an effective level of electrical shock when your cows or cattle come in contact with the fence, regardless of the weather or ground conditions.   

Miles versus Acres 
Another common area of confusion when comparing fence chargers is the question of miles of fence versus acres of property. 1 square mile = 640 acres. 
An electric fence will most likely have multiple rows of wire. This means the number of miles of wire will increase by the number of wires on the fence. Unless you are just creating a single wire of electric fence on top of an existing PVC railing fence or wooden fence, your electric fence will contain multiple rows of fencing. 
Additional Questions to Ask to Effectively Contain your Cows and other Farm Animals 
There are a number of ways you can determine the right electric fence charger for your dairy farm, cattle ranch or hobby farm. Ask yourself:

• How many acres of my ranch will be enclosed by the electric fence? You will need to consider the size and shape of your farm. A square acre requires less miles of wire than a rectangular area of fencing.
• How many miles of wire were used to enclose the cattle or dairy cows? Most dairy farmers purchase their wire on spools 1/4 mile in length. How many spools were needed to enclose your cattle ranch?
• What output joules are required for the specific livestock; sheep, cows, cattle, etc.? The larger the animal and the larger the area enclosed, the more output joules are necessary.
• Predators are another consideration when building your electric fence. Energizing the top wire helps deter your dairy cows, beef cattle and other livestock from breaking through the fence and the powered lower wires will keep trespassers and predators like the feral hog from gaining access to your dairy farm, cattle ranch or hobby farm.

WHY IS IT IMPORTANT TO HAVE THE RIGHT ELECTRIC FENCE CHARGER?
Farmers and ranchers have selected the electric fence solution when it comes to containing their cows, horses and other livestock because it is an affordable and safe alternative to barbed wire. Fence chargers are also used to keep animals, like rabbits, deer and raccoons, out of fenced areas such as a vegetable or flower garden. The short pulse of electric current that is delivered when the cow or cattle contacts the electric wire is just enough to keep them from trying to break through the fence.
Farmers need to select a fence charger that will deliver enough power to consistently provide the electric pulse  necessary regardless of the size of the fenced area, the type of cow or cattle or the ground conditions surrounding the fence. Installing the wrong type of fence charger can lead to:
▪▪ Inconsistent delivery of electric shock.
▪▪ Inadequate strength of the electric shock that is delivered.
▪▪ Injury of livestock.
▪▪ Cows, cattle and other livestock damaging the fence.
▪▪ Lack of electrical current in an area with heavy weeds or consistent power outages.  

Select the Right Fence Charger to Effectively Contain Your Cows, Cattle, Horses and Other Livestock

Of all the methods available for safely keeping cows, cattle and other livestock contained, farmers agree that an electric fence is an affordable and effective solution. An electric fence charger provides a single pulse of electrical current per second when your dairy cows, beef cattle or other livestock encounter the fence wire. The electrical shock provided by the charger is harmless yet effective and serves as a psychological message to your cows that reminds them to stay clear of the fence.  

Possibility of Expansion?
Another fact to consider when selecting a fence charger is whether or not your fenced area will expand or change in size and/or location over time. In particular, if you have a remote, fenced pasture that is moved from season-to-season or may be expanded at a later date to accommodate a growing herd, that should be taken into consideration when selecting a fence charger. It is unsafe to have more than one fence charger on an electrical fence; therefore, if there is a possibility of your pasture size changing, you may want to opt for a larger model.  

CLEARING UP THE MYSTERY
Comparing fence chargers from one brand to another can be a challenge. Packaging labels focus on different elements of the fence charger and can be confusing to decipher. One brand may focus on  miles of wire while another will emphasize the acreage. Some brands talk about joules and others refer to volts, amps or watts.

Following are a few definitions that will help in the understanding of:
▪▪ Volts, Amps, Watts
▪▪ Joules: Output or Stored
▪▪ Miles vs. Acres
▪▪ Low Impedance vs. Ultra low impedance  

Volts, Amps and Watts
Volts are a unit of measure that determines the amount of electric pressure; the higher the number of volts, the more electric pressure. High volts are needed when containing larger animals with tougher hide or fur. An amp measures the amount of electricity as opposed to the force of the electricity as in a volt. A larger number of amps will cause a greater sensation for the cow or cattle when they come in contact with the fence.
A watt is the unit of electrical power. In other words, it is the combination of the amount of electricity and the electrical pressure: Amp x Volts = Watt. Typically this term is not used on the packaging of fence chargers.  

Joules: Output or Stored
Joules is a term frequently used in fence charger descriptions and on the packaging of fence chargers, however, there are two measurements of joules:  

Output and Stored.
A joule is a unit of energy. Watt x seconds = Joules. It refers to the energy level of the fence charger and the amount of electricity felt in the single pulse per second generated when the cow or cattle encounters the fence. The higher the volt and amp, the higher the watt. The higher the watt, the more joules delivered per second on the fence line.

The important thing to compare when it comes to joules is whether it is output of joules or stored joules. Stored joule energy is approximately 35% less effective than the same number of output joules. When comparing fence charger brands by number of joules, make sure to compare fence chargers by the number of output joules.