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Electric fence school

• Alternative uses
• Shock principles
• Fence planning
• Fence layout
• Wire configurations
• Wire types
• Post types
• Insulator types
• Uninsulated fences
• Electric fence accessories
• Grounding tips
• Shock requirements
• Low vs. hi-impedance
• About AC chargers
• About DC/solar chargers
• Radio freq. interference
• Electric fence safety
• Storage and cold weather
• Troubleshooting tips

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Electric fence school

Low-impedance versus high-impedance fence chargers

Older fence chargers were high-impedance output. The output from a high-impedance fence charger is high voltage, but low current. Because of this, poor insulators or grass and weeds touching the fence drain much of the shock.

Newer fence chargers are mostly low-impedance output. The output from a low-and impedance fence charger is, medium to high voltage, but at much greater currents. Low-impedence fence chargers have a large reserve of current and are able to power (in other words, charge) very long fences or fences that are overgrown by green growth.

The following diagram shows the difference in voltage outputs between high and low-impedence fence chargers.