What is the maximum fee allowed for vehicle storage in Alabama per day?

Whatever you agree too, there is no legal limit or minimum amount charged unless you have the car impounded by the police or towed to police facilities, NOTE if your vehicle was towed due to parking violations or left on the side of the road, you have technically abandoned the vehicle, so if it was towed from a private lot look at the parking signs about towing, by knowingly leaving your vehicle there you automatically agreed to whatever the property owners fees were at the time.