I converted a Temp/Hum station to DFARS and also run the fan on my snow rangefinder temp sensor using a dual solar panel Davis (part of the DFARS kit). To wire the solar panels to these fans, I used these pre-made harnesses:
Xking The pins match the ISS/SIM solar panel connections. (mind the polarity, but I think that I was able to directly connect them
if I remember correctly.
I bought the empty back shell (from Scaled Inst.) to mount a spare solar panel that I happened to have. I used shrink tubing to protect the connections from the weather where I had to join them.
Greg H.