Dew heater controller?

[synfinatic]

Using some N-channel P-MOSFET's like this:
http://www.digikey.com/product-search/en?vendor=0&keywords=irlb8721

We can create a dew heater controller. Each FET can handle a ton of power without requiring a heat sink and is PWM controllable. Would use RCA jacks for connections and need some kind of simple control? What about temp/humidity sensors to automatically adjust? Word is that is mostly useful for Schmidt/Cass's.

Would require a very heavy duty power supply/wiring option. A std barrel jack won't do it. We should use separate power supplies for the arduino/FET's to prevent noise.

Things to consider:

• 4 channel, 10Amp fused
• Adjustable low battery cut off & warning
• Simple 1-wire temp sensors for auto-adjusting 1-2 channels
• All channels should have manual adjustment in 10% increments
• LED or some other indicator for showing which channels are on/off
• Ambient temp/humidity measurement?
• Dew point alarm Dewpoint alarm #13