SQ pumps on mod sine wave [RE-wrenches]

jay peltz jay at asis.com
Mon Apr 29 13:37:58 PDT 2002


Hi Windy,

I've got two SQ 1/3 hp running on a SW4024.  They work great.  I have them
at 240v running through a T240 Tformer.

ITs fun to see the pump start and the amps just rise up, no spike.

jay
peltz power

"Windy Dankoff, Dankoff Solar" wrote:

> Grundfos SQ pumps are extremely electronic. The power is rectified to
> DC then inverted to variable frequency 3-phase AC in order to control
> the motor speed and to get very high speed.
>
> Anything that uses this much electronics cannot be depended on to
> always work right on a modified wave inverter. I'm not saying it
> won't work, but I would suspect interference. Even if it works OK
> initially, remember the waveform varies with battery voltage and
> total load so it may goof up tomorrow, and under any conditions, the
> load tends to run hotter and be less efficient and less reliable.
>
> I've heard the SQ pumps work fine on sine wave inverters.
>
> Windy
>
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