Patriot SolarGuard 150
A small acreage solar charger with a long warranty, for goats, horses or a rotational grazing paddock.
Amazon $209$209
The Patriot SolarGuard 150 is the better electric fence energizer overall, rated 3.1 to 2.7. The Patriot SolarGuard 150 costs $80.99 less ($209 vs $289.99).
Gallagher S20 Lithium Solar
#10 in Battery and solarFull review
A portable lithium solar charger for rotational grazing and small pastures, if you value Gallagher’s battery and warranty over raw output.
Amazon $289.99$289.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every battery and solar electric fence energizer; a clear win is highlighted. How we rank explains each one.
| Factor weight | Patriot SolarGuard 150 | Gallagher S20 Lithium Solar |
|---|---|---|
| Overall rating | 3.1/5 | 2.7/5 |
| Value 35% | 18 $1,393.33 per joule ($209, 0.1 J output) | 10 $1,933.27 per joule ($289.99, 0.1 J output) |
| Output 25% | 25 0.1 J output | 25 0.1 J output |
| Warranty 25% | 100 3-year warranty | 100 3-year warranty |
| Lightning cover 15% | 50 lightning cover not stated (neutral score used) | 0 lightning damage not covered |
Specifications
| Patriot SolarGuard 150 | Gallagher S20 Lithium Solar | |
|---|---|---|
| Output | ||
| Power | Solar | Solar |
| Output energy | 0.1 J | 0.1 J |
| Stored energy | 0.2 J | 0.2 J |
| Rated fence length | 10 miles | 12 miles |
| Rated area | 40 acres | 40 acres |
| Peak voltage | 9.3 kV | 9.3 kV |
| Low impedance | Yes | - |
| Build | ||
| Battery | 6 V | - |
| Solar panel | - | 3 W |
| Lightning cover | - | No |
| Warranty | 3 years | 3 years |