Easy way to switch from Solar Panel to Battery as power source for exhaust fan

Heisenberg

I have a 12v exhaust fan that is powered by a solar panel, and the fan only runs when the sun is shining as it is intended to.

I am wondering if there is a way to have the fan set up so that if I want it to run during the evening, I can disconnect the power source coming from the solar panel and have it switch to my battery bank as it's power source. I will note that the solar panel that powers the fan is completely separate from the panels that charge my battery bank.

I was thinking it would be nice if there would be some type of switch or component that I could isolate both power sources coming to it, connect the "switch" to the fan, and then flip the switch to whichever power source I want the fan to run from.

Not sure if I am getting my point across but wondered if anyone has any ideas?

Thanks :cool:

Cariboocoot

Re: Easy way to switch from Solar Panel to Battery as power source for exhaust fan

SPDT switch.

Center connects to the fan, one pole to the panel, the other to the battery. All negatives in common.

Now, how are you going to keep that battery charged?