The first fence decision most homesteaders face: solar energizer or mains-powered? Both work. The right choice depends on where you're fencing, how far from the house, and how much maintenance you tolerate. Here's how to pick without overspending.
Quick answer
If the fence is within 150 m of an outlet and you have reliable AC power, go mains. You'll get more power per dollar, no battery maintenance, and the unit will outlast a solar setup by 3-5 years. If the fence is remote (back pasture, rotational grazing, hobby orchard), go solar.
Mains: pros and cons
Pros:
- More joules per dollar. A 10J mains energizer costs $250-400. A 4J solar costs about the same.
- Zero battery maintenance — plug in and forget.
- Reliable through Canadian winters (solar output drops 60%+ in December-January).
- Longer lifespan — 8-12 years typical vs. 4-6 for solar battery units.
Cons:
- Power outages = no fence. A $40 UPS solves this for short outages.
- Needs 110V near the fence. Running a long drop cable is expensive and a weak-point for water infiltration.
- If your mains grounding is weird (older farmhouse, ungrounded outlets), the fence can behave strangely.
Solar: pros and cons
Pros:
- Install anywhere — remote pasture, rotational grazing, back forty.
- Zero wiring.
- Modern units have integrated battery + controller + solar panel, simple to service.
Cons:
- Less power per dollar. Canadian-climate solar typically tops out at ~2-4J for hobby budgets.
- Winter output drops sharply. December-January at 49° latitude can be 70% reduced.
- Battery wear — most sealed lead-acid units need replacement every 3-5 years. LiFePO4 upgrades last longer but cost more.
- Theft risk. Solar units have resale value.
Decision matrix
- Paddock next to the barn: mains.
- Back pasture 500 m away: solar.
- Horses year-round (need guaranteed shock): mains, always.
- Summer-only rotational grazing: solar is fine.
- Predator exclusion around chickens (needs 8kV+): mains, especially in winter.
- Garden deer fence in season: solar, pull it out for winter.
Sizing the energizer
Regardless of source, match the energizer to your load and grounding:
- Low load (poultry, garden, under 500 m): 1-2 J output.
- Medium load (sheep, goats, horses, 500 m - 2 km): 3-6 J.
- Heavy load (cattle, predator exclusion, 2 km+): 6-15 J.
Whatever you pick, match it with proper grounding (1 m rod per joule). See our Electric Fence Grounding guide.
FAQ
Can I run a fence off a car battery?
Yes — many low-power DC energizers are designed for it. Swap and charge the battery weekly. Overkill for most setups, though.
What about battery-backup mains?
Best of both worlds if you can afford it. Some mid-range Gallagher and Stafix energizers have 12V battery-backup inputs. Power failure automatically switches to battery.
