My girls are in a tractor with an attached electric fence that we leave on all the time unless we are tending to them. We have at least one fox in the area and they do hunt during the day so we think that it is prudent to run it 24x7.
The charger that you have there should be more than enough for the area that you're covering. Just make sure that you have it well grounded. I try to get a few ground rods put in at the extreme edges when I put a charger in place. When an animal touches the wire it completes a circuit from the charger through the wire through the animal through the ground through the ground rod and hookup wire and back to the charger. The highest resistance in the circuit is the ground itself so using extra ground rods shortens this distance.
The charger that you have there should be more than enough for the area that you're covering. Just make sure that you have it well grounded. I try to get a few ground rods put in at the extreme edges when I put a charger in place. When an animal touches the wire it completes a circuit from the charger through the wire through the animal through the ground through the ground rod and hookup wire and back to the charger. The highest resistance in the circuit is the ground itself so using extra ground rods shortens this distance.