I have a product idea. It needs to generate enough heat to melt 1/2" of ice off of an area approximately 18sqft in ambient temperatures down to -10 F; be battery powered(12V rechargeable); flexible yet durable. I am electrical knowledge challenged, and have no idea where to start. I have seen various heating elements, ie. Kapton, carbon fiber, etc., but have no idea how to determine heat/resistance calcs on various heating elements, or which type of battery will have the capacity to generate enough heat to do the job! Can anybody point this sorry "marketing" type in the right direction?