Or just throw the tecs away and get a giagantic 3phase hvac compressor and build a phase change 5stage cascade that runs on nitrogen
Permenant ln2 temps for the same price electricity wise as your hooge tec array
And yes ripple is a killer on tecs cooling wise aswell, i was experimenting with some 10000uF caps on my homebuilt psu and with 0uF smoothing the temps were like 15degrees higher than with 50000uF worth
]JR[