I am thinking of purchasing some bred heifers and putting them on a farm that is partially fenced. I have temporary electric fence on the partof the farm that does not have permanent fence. When I have had cattle there before the calves always get out of the electric fence. The fence is about 1/3 of a mile and two strands. I am using a Gallagher 12volt solar charger. What is the most powerful solar charger that some of you are using and what is the cost. Using a plug in charger is an option, but I would have to run alot of wire or extension cord. Any advice is appreciated.