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
The Gallagher S20 Lithium Solar rates 2.7 among battery and solar electric fence energizers; the Patriot PE2 rates 1.9 among plug-in ones. The Patriot PE2 costs $253.50 less ($36.49 vs $289.99).
Patriot PE2
#15 in Plug-inFull review
A budget plug-in charger for gardens, pets and small poultry runs, not for livestock pastures.
Amazon $36.49$36.49
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
These two sit in different power source classes (battery and solar and plug-in), and each is scored against the reference points for its own class, so a rating says how well each does among its own power source peers. How we rank explains each factor.
| Factor weight | Gallagher S20 Lithium Solar | Patriot PE2 |
|---|---|---|
| Overall rating | 2.7/5 | 1.9/5 |
| Value 35% | 10 $1,933.27 per joule ($289.99, 0.1 J output) | 9 $364.90 per joule ($36.49, 0.1 J output) |
| Output 25% | 25 0.1 J output | 0 0.1 J output |
| Warranty 25% | 100 3-year warranty | 0 1-year warranty |
| Lightning cover 15% | 0 lightning damage not covered | 50 lightning cover not stated (neutral score used) |
Specifications
| Gallagher S20 Lithium Solar | Patriot PE2 | |
|---|---|---|
| Output | ||
| Power | Solar | Plug-in (110 V) |
| Output energy | 0.1 J | 0.1 J |
| Stored energy | 0.2 J | 0.2 J |
| Rated fence length | 12 miles | 2 miles |
| Rated area | 40 acres | 8 acres |
| Peak voltage | 9.3 kV | 5 kV |
| Low impedance | - | Yes |
| Build | ||
| Solar panel | 3 W | - |
| Lightning cover | No | - |
| Warranty | 3 years | 1 year |