I have a Zereba Solar electric fence unit... It has been very cold here in New Jersey and we lose sunlight at about 4-4:30 in the afternoon. The fence has not been working because of this... Does anyone know if there is a way to still provide electricity to my fence when this happens? Car Battery? Anything? I want to make sure my birds are ok from the many raccoons, coyotes,un-hibernating bears and the fox... If you have any information that may help me please let me know. I appreciate it! Thanks!!!!