What's the best way to make a warm metal plate?

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To create a warmable metal plate measuring 70x45 cm using electrical heating, induction heating is suggested, although battery limitations may restrict heating capability. The required temperature is to be sufficient to melt snow, indicating moderate power needs. Adhesive warming pads or resistors can be used as heating elements, with options available that provide similar heat output to light bulbs. Tank or block heaters are recommended for effective heating, and smaller versions compatible with car batteries are also viable. Overall, the discussion emphasizes the importance of balancing power requirements with the desired heating efficiency.
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As the title says (and yes, I know it sounds a bit weird), what's the best way to make a warmable metal plate (70*45 cm big), using electrical warming? I've been thinking about using induction heating to make the plate warm, but I don't know the best way to do it. It should be battery driven and also have a switch, but that's basically the only components that I want the plate to have. So what's the best way to make it? And also, I would appreciate a simple circuit diagram.
 
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A bunch of resistors bolted to the back of the plate, or you can buy adhesive warming pads that have a resistor spread through them.

Depends on how much power and who hot you need it to get - if you are running from a battery you aren't going to be able to heat it very much.
 
Ok, thanks for the tip.
 
How hot do you need and how much power - ie is the plate insulated or does it have cold water pouring over it?
 
I'll need power enough to melt snow on it, ie not that much power I guess. The warmer the better though.
 
Best way probably tank/block heaters.
Adhesive pads about 6x6 or 12x12 inches that put out about as much heat as a lightbulb. You use them to stop fuel tanks freezing or frost in greenhouses.

Something like this (http://www.kennedydiesel.com/detail.cfm?ID=372) you can also get smaller ones that run off a car battery.
 
Alright, I'll try that, thanks again for the help. :)
 
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