We have had pretty fair luck with a Parmak solar fence charger. Got it from Attwoods in Sapulpa. About $20.00 cheaper than Tractor Supply in Edmond,OK, and when the first one went bad they didn't question me, just told me to go back there and get another one. Here in Creek County we have lots of rock just under the dirt so finding a place to drive the ground rod into the ground was tricky too.