I'm planning an addition to my liquid cooling system for my computer. I would like to use two TEC-12715 peltiers, which pull up to 15a @ 16v, and two CPU fans, probably pulling around 5W total power. However, for pricing and other reasons I was considering this power supply, which supplies 30a @ 12v.
I know that the peltiers will work at 12v, though I suspect at a lower efficiency and higher amperage(?). What my novice electronics understanding is struggling with, though, is understanding what will happen given that my devices can pull more amps than the power supply can provide.
I suspect all four devices (2x peltiers, 2x fans) will just get less power than they can handle, and the peltiers will dissappate less heat than their capacity and the fans will run at a slightly lower RPM. Is this correct? If so, will the power loss be a constant percentage of total power across all devices (everything runs at 90% power), or will the fans still get all the power they need (since their load is so small) and the peltiers will just run at lower power? Or is this all a really bad idea that will cause the PSU and devices to fail in bad ways?