I am building a solar swamp cooler for burning man (hot dry desert environment).
Purchased a 15w solar panel that outputs 0.9a at 20V in full sun (verified as true with my voltmeter). The solar panel apparently provides 0.8a at 17V under load.
I applied the output to power a 12V fan rated at 0.4a, and it seemed to work fine, although a little slow.
THEN, I applied my PC power supply output to the fan, and it hummed along superfast, providing an awesome air current.
What's the story here? If the fan draws 0.4a, what is the solar panel lacking?!
Thanks for any insights!