I have a leftover solar panel that I want to use to ventilate my attic. The panel is a Evergreensolar es-a-210-fa3 about three by five feet. Can someone suggest a fan and other components to use this panel and where can I purchase them? Thanks, first time on your site.

 

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Finding a large DC powered fan could be difficult.
You could use a DC-AC inverter to generate 120Vac and use that to power a standard attic fan.

Alternately you could use a 12V fan, such as this, but you would need some type of regulator to limit the voltage from the panel.

 

When, and for how long do you want the fan to run? Are you expecting it just to run just when there's enough sunshine? If not, you're maybe looking at batteries and a charging system too.

 

The simplest idea would be to use multiple 24v DC fans, connected in parallel.

They will run a bit slow, but it's dead simple.
Trying to find one big DC fan will be far more difficult and expensive than just using a bank of small cheap ones.

 

For large DC fans, look at automotive radiator fans.

Ken