Do u think this is about right?
Part of our fence is electrified with a solar panel, so if we get a run of overcast days its not charged up fully. But horses have good memories, so once they've been shocked with a wet nose to the fence they always remember and they don't "try" the fences. But I would always prefer the secure feeling of knowing the fence was on, especially if I had to be away for part of the day.
Check with your local feed or tack store for the cost of electric braid fence and posts in your area because it really varies.