The SQF series pumps had a VFD drive and MPPT built into the pump motor -- no welltop controller was actually needed, except to integrate float switches into it, switch between different sources, or show what the pump was doing. But it would run with 30 to 300 volts DC applied directly to the power wires, or 90 to 240volts AC, no controller. Because of this, you can't measure the windings of the motor directly on the output leads like a pump that has just a motor on it.
I did not realize that they were out of production now. I know there are a lot of cheaper chinese variants out there now at half or a third the price of a SQF, but I have not tried any of them yet. Most of the ones I've looked at specs for are a bit more limited voltage input range compared to the SQF's though. Zeke -- Zeke Yewdall PV Engineer NABCEP #031508-89 [email protected] 303-523-3592
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