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Originally Posted by Cathar
More interesting is the pump's performance at higher voltages. The pump is rated at up to 24V operation due to it meant to be powered by solar cells from my understanding of why the pump exists.
At 16V (actually tested) the pump is an "almost" match in terms of performance with my 50Hz Iwaki MD30-RZ, but draws just 24W (rather than ~60W).
At 20V I estimate that it would be a dead-on match for a 50Hz MD40-RZ or a 60Hz MD30-RZ and draw around 32W, if it follows the same performance increase pattern that I'm seeing from 5V->16V.
Edit: I should add that this performance does come at a cost - and that is noise. At 12V the pump is about the same pitch/volume as a ~4000RPM 60mm fan. At 16V, more like a ~5000RPM 60mm fan, and at 20V I reckon you'd be remembering the bad old days of screaming delta 60mm fans.
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hmm - how much quieter (and at what performance cost) would you get by dropping below 12V? ... the power draw seems within the specs of a sunbeam rheobus....
have you tried different orientations of the pump to see if that affects the noise? (seem to recall the mcp600 is quieter with the intake vertical...)