Parmak MAG12-UO 12V Electric Fence Charger — Low-Impedance, 30-Mile Range, Twin Output

The Parmak MAG12-UO is a 12-volt, low-impedance battery-powered electric fence charger built to deliver up to a 30-mile protected fence line with an integrated performance meter and weatherproof housing.

Designed for remote pastures, rotational grazing, and small-acreage perimeter control, this Magnum-series unit combines portability with dependable pulse output. It runs from a 12-volt battery and is optimized for sites without mains power, giving you a robust deterrent for livestock or wildlife while conserving battery life through efficient circuitry.

How long will the MAG12-UO run between battery charges?

Under typical conditions the MAG12-UO can operate up to three months on a single battery charge, depending on fence length, vegetation contact and pulse load. The unit is engineered for low current draw so it maximizes time between maintenance visits.

• Typical run-time: up to three months on one 12V battery
• Actual duration varies with fence load and grounding quality
• Low-impedance design reduces energy loss on heavier fence loads

What does the built-in performance meter show and why does it matter?

The exclusive Parmak performance meter displays the fence’s operating condition so you can quickly spot shorts, heavy vegetation contact or grounding problems. Instead of guessing, you read the meter and prioritize repairs, saving time and keeping the line effective.

• Real-time indication of fence voltage and load
• Helps identify shorts and areas needing vegetation clearance
• Makes troubleshooting faster and more accurate on-site

Can I use the MAG12-UO outdoors year-round?

Yes—the unit’s weatherproof, portable housing is built for outdoor mounting and seasonal exposure. Durable construction and corrosion-resistant terminals help it endure typical farm and pasture conditions, though strategic placement under partial cover will extend service life.

• Weatherproof enclosure for outdoor installation
• Portable design for temporary or permanent fences
• Made in the USA with rugged components for field use

What fence length and performance can I expect from this charger?

The MAG12-UO is rated to energize up to a 30-mile fence under ideal, low-load conditions; practical range depends on fence type, conductor count, and vegetation. Its low-impedance output is specifically suited to maintain strong pulses over longer runs and through partial shorts.

• Rated maximum range: up to 30 miles on very light loads
• Low-impedance output maintains pulse strength on long runs
• Works well on multi-wire pastures and perimeter systems

Who is this for: The Parmak MAG12-UO is aimed at farmers, ranchers, and landowners who need a reliable battery-operated energizer for remote or off-grid fencing. It's especially useful where long runs, frequent vegetation contact, or mobile fencing require a low-impedance charger with on-board diagnostics. If you want a weatherproof, USA-made unit with extended battery life and a performance meter to simplify troubleshooting, this model fits those needs.