24 replies to this topic

[Juls]

You can restrict flow on the exit tap, if you go too far you will notice the motor groan a bit.

However it will use more power not less in this case as the motor has to work harder, the motor doesn't know your trying to slow it down so it will keep trying to pump at the same speed, as more load is applied it will compensate by using more energy.

Juls

[Neakit]

no, not necessarily juls, The pump can only do one speed so it cant compensate by drawing more power, closing the tap will act a little like head height, there is documented cases where a pump uses less power when its pumping less.

[meedee1209]

had mine for a week now set up on my current tank to save time conditioning my tank thats coming in 2 weeks ... quiet as anything, running so good. . and i do like the 2 minutes of air purge it does every 24hrs .. safety controlled to keep air out of the canister increasing its life expectancy and performance

took me alot of research and confusion but did decide to get one and im glad i did

good to hear yours is doing well

[ruffaz]

no, not necessarily juls, The pump can only do one speed so it cant compensate by drawing more power, closing the tap will act a little like head height, there is documented cases where a pump uses less power when its pumping less.

I disagree less restriction means the pump any pump (fish tank automotoive water supply) works with less pressure, more restriction means the pump works harder however to push water through the power usage is basicly set unless it has a potentiomiter(spelling) adjusting the speed or amount of power it uses by incressing the available head height will decress the flow etc longer pipes before the tank will achieve this

[werdna]

You can disagree with my power meter if you like. Neakit is still correct.

My 5000lph pump draws 110w when nothing is connected to it at all and it is just sitting in a water tank.
By increasing pressure or head height (I slowly blocked off the water outlet) the impeller spins slower and less current is drawn.
The principles for power draw are different for these motors as they are for every other one.
Power draw is directly related to impeller speed.

Same goes for magnetic drive air pumps, more restriction, less power draw.
My Resun LP-100 draws 110w when it is on with nothing connected to the output
When connected to all my tanks the power draw drops to 85w.

I would have agreed with you right up until I tested the theory myself.