You could poss run the same as i use and that's a 12v 10w car bulb, i think its a 10w, might even be a 5w one, it sits in a bulb holder, wired to a temp switch. that can be run off a 12v battery. You need to insulate the lining of the inside of the cone, i did this by sandwiching small bubbled bubble wrap between 2 sheets of foil, sealed together with just tape along the edges, when you create the cut for the 2 ends to join up, its needs to be on a slant, so it joins in a cone shape. Because its such a small bulb, its not fast thawing but it deffo works for what little snow I've had over the last 6 years'ish