vinceherman:
Do you need it to run full time to keep above your minimum temp?If the heating pad provides a 40 degree differential over ambient, when you are only a few degrees below your min temp, you could use PWM with a very low duty cycle to save power. Then, when it gets colder, your duty cycle will go up.
Hi,
Many thanks for the suggestion, I'm not really sure how things will behave during the flight so it's difficult to know what to do for the best. I guess this is essentially a test flight so, assuming I get the payload back, I can study what is on the SD card and determine how to tweak things for next time :O)
Best wishes
Phil