Use a wire nut to secure all together.
How to connect solar panel to fan.
How to power fan directly from solar panel.
Then i cut the 30 foot mc4 cable in half and attached each y adapter to it s mating end of the cable halves.
Just treat the leads of the panel like those of a battery red and black just connect those to the fan if you match color for color no problem.
Connect one wire from the controller to the panel wiring and connect the other wire to the fan wiring image 2.
In order to run a solar fan directly from solar panel without battery you need to select whole system carefully.
If the markings are not present and no wires.
Secure the temperature controller within the electrical box and set a temperature that will activate the fan.
It would be good to put a dc controller in between panel and dc fan.
A fan having 12vdc and 25 watt need a panel of 12vdc and 30watt.
I used the renogy y adapters to connect the two panels in parallel.