Reduce well pump starting current

[Quattrohead]

Your NTC thermistor inrush limiter will keep the motor from getting the current it was trying to draw to start fast, so there is a chance it fails to start. If inverter shuts off the motor is protected, but larger inverter might remain on.

I suggest putting in a magnetic-hydraulic breaker, such as Midnight/CBI.
What that will do is allow surge current for just seconds, then trip if the motor remains stalled.

But as the motor is starting up or indeed stalled the NTC is getting hot and the resistance will dive, hopefully the motor will start then.
I think a properly rated NTC or capacitor is well worth a try.
Properly rated, now that is the tricky part !!!

 

[yabert]

how about this?

Well, it's exactly what I used. It's an inrush current limiter. See post 11.
There is two potentials problems (for the moment it work).
1-This device heat up and reduce in resistance to let the current flow. It will need time to recover his initial resistance, so in case of frequent start and stop the current will be higher and higher up to the moment the inrush current limiter cool down.
2-As Hedges wrote, motor can have problem to start and potentially overheat.

In my case, it work well since few days now, but I don't know exactly the consequences on motor pump.
To me, the pump now work exactly the same on Inverter or on grid.

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