Fencing · 7 min read
Sizing a solar fence energizer without guessing
Joules, miles and grounding explained for goats, horses and poultry netting - so your fence actually holds.
By WORKING ACRE Field Desk · Updated
Key takeaways
- Size by joules and fence length, not by the box's best-case miles.
- Grounding causes most weak fences.
- Goats need higher voltage than cattle or horses.
/ Joules, not miles
Box claims assume one clean wire and no weeds. Real fences leak. A good rule is about 1 joule per 6 miles of single wire, less with poultry netting.
| Animal | Target voltage | Notes |
|---|---|---|
| Horses | 2,000+ V | Visible tape helps |
| Cattle | 3,000+ V | One or two strands |
| Goats & sheep | 4,000+ V | Wool and hair insulate |
| Poultry netting | 3,000+ V | Keep grass trimmed |
/ Grounding is half the circuit
- Use at least three ground rods, 10 ft apart.
- Drive rods into moist soil.
- Use galvanised clamps and wire.
/ Fence maintenance checklist
| Frequency | Tasks |
|---|---|
| Weekly | Walk or drive the line, check voltage at the far end |
| Monthly | Clear vegetation, tighten wires, check insulators |
| Seasonally | Test ground rods, inspect gates and corners |
/ Frequently asked
Will a solar unit work in winter?+
Yes, if the panel faces south and the battery is sized for short days.
Is an electric fence safe for pets?+
A properly built fence gives a sharp but safe pulse. Always add warning signs.