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 is the better electric fence energizer overall, rated 2.7 to 2.6. The Zareba 10 Mile Solar ESP10M-Z wins on lightning cover. The Zareba 10 Mile Solar ESP10M-Z costs $140.24 less ($149.75 vs $289.99).
Zareba 10 Mile Solar ESP10M-Z
#13 in Battery and solarFull review
A good value self contained solar charger for a remote pasture or rotational grazing paddock with clean fence lines.
Amazon $149.75$149.75
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.
Which should you buy?
- Choose the Zareba 10 Mile Solar ESP10M-Z for lightning cover (warranty covers lightning damage vs lightning damage not covered).
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 | Gallagher S20 Lithium Solar | Zareba 10 Mile Solar ESP10M-Z |
|---|---|---|
| Overall rating | 2.7/5 | 2.6/5 |
| Value 35% | 10 $1,933.27 per joule ($289.99, 0.1 J output) | 25 $998.33 per joule ($149.75, 0.1 J output) |
| Output 25% | 25 0.1 J output | 25 0.1 J output |
| Warranty 25% | 100 3-year warranty | 0 warranty not published, scored as none |
| Lightning cover 15% | 0 lightning damage not covered | 100 warranty covers lightning damage |
Specifications
| Gallagher S20 Lithium Solar | Zareba 10 Mile Solar ESP10M-Z | |
|---|---|---|
| Output | ||
| Power | Solar | Solar |
| Output energy | 0.1 J | 0.1 J |
| Stored energy | 0.2 J | 0.3 J |
| Rated fence length | 12 miles | 10 miles |
| Rated area | 40 acres | - |
| Peak voltage | 9.3 kV | 9.5 kV |
| Low impedance | - | Yes |
| Build | ||
| Battery | - | 6 V |
| Solar panel | 3 W | - |
| Lightning cover | No | Yes |
| Warranty | 3 years | - |