The one we use is listed at 15,400 with no load. Running at least 3 wires over 4 different pastures, some with cross fencing, at the longest distance from the charger we usually have 7,000+ volts. Vegetation and dampness of the ground have some effect but as long as it stays above 7,000 in the worst case I consider it good. We've not had any goats escape with this charger unless the fence has been grounded. At shorter distances, when we've turned off some of the extra pastures, and/or have a clean fence, the readings are above 10,000.