I just got a big buddy to use in my xth lodge. How long can I expect the fan to run on the D batteries?
This is so timely because I just finished a comprehensive video last night on how to modify for a variety of power options including 12V. I hope to get it uploaded tonight.
But to answer the OP, it seems that under good circumstances, the math would suggest about 24 hours of run time on 4 d cell. I tend to think this is a bit steep though. The main thing to know here is the fan consumes approx. 400mA of power.