|
Ah! I should have read your post with more care. My sensor dew heater regularly operates dew free down to -5C. It's a slightly different design. Resistance ~7ohms and 5v seems to do the job, providing the edge of the wire is line of sight to the sensor. However, I think a certain amount of conduction is at play through the plastic as well. It's quite aggressive and diminishes the total cooling effect by 4C or so. Still adequate to get down to -5 most nights.
|