DC pumps:huge power savings, really?

[gridley]

Originally Posted by intarsiabox

Not really, you can get VFD's (variable frequency drives) to control AC pumps. A lot of commercial/industrial buildings use this method for their pumps and fans to cut down on energy costs.

Ahaa - I get to learn something new everyday! LOL

Originally Posted by mark

Not to forget by restricting outlet of AC pump like the Barracuda, flow and power draw will decrease.

Sphelps, 4m and 4000l/h @ 85w still sounds to good to be true as that 3-4X the efficiency of the Reeflo

I'm not sure about this - unless the Barracuda operates differently from other pumps, the ability to restrict the outlet does reduce flow, but that isn't linked to power draw - reducing the output/flow typically increases the back pressure on a pump but I'm not sure that it reduces power useage.

[lastlight]

That effect has been measured for sure with the reeflo pumps.

[sphelps]

Originally Posted by gridley

Ahaa - I get to learn something new everyday! LOL



I'm not sure about this - unless the Barracuda operates differently from other pumps, the ability to restrict the outlet does reduce flow, but that isn't linked to power draw - reducing the output/flow typically increases the back pressure on a pump but I'm not sure that it reduces power useage.

Power draw will reduce slightly as head pressure increases, this is typical for most centrifugal style pumps.

You can see in the spec sheet how the power drops.