I am starting a new run that is too far from any electrical outlet, so I am looking into a solar charger. I had a Par-mak solar charger about 10 years ago when I had horses, but the price tag on those are in the upper $200s. I really don't want to pay that much as I've already spent too much money on the new coop and run as it is. I found one at the farm store at a decent price (its a Zareba, and I like that brand) but the joule on it was 0.06. I know that is not the same as voltage, but will it have enough juice to deter a fox or coyote? I am looking to surround a 50' x 60' area. I have good soil for grounding.