FlaSky:
I made dew heaters from some nichrome wire and duct tape. You can calculate the size and length of wire with online calculators. Google is your friend for that. I use a 12 volt battery of the type that is sometimes used for gate openers or wheelchairs. I think it's about 20 amp hours. Some cheap PWM dimmers from Chinese Ebay sellers to control the heat and you're on your way. The whole heater rig didn't cost me $30 except for the battery, which I use for powering the mount.
There is a great site for SE owners with lots of good info here:
https://www.nexstarsite.com
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