1. Normal equipment can have minus -20. And I don’t think it has impact on your remotes.
A good room temperature is always best because the devices get a little warm and this consumes
moisture from the air which can shorten the life so.
2. Per the generator specifications:
Operating temperature is from -10 to 50 degrees Celsius, and storage temperature is from -20 to 70 degrees Celsius.
Converted to Fahrenheit: Operating temperature is from 14 to 122 degrees Fahrenheit, and storage temperature is from -4 to 158 degrees Fahrenheit.
For more details, please check the link from: