I put in a bore a couple of years ago with a chinese bore pump (nominally 72V, 750W, 5m3/h)
It worked well for two years and then the controller failed.
The pump is 3ph which is generated from the (DC only) controller which has a few user configurable parameters, but is mostly locked down.
The supplied controller is rated 150V max input. My PV setup is 3s2p providing 106V on a cold morning dropping to 100V in full sun (cold is a relative term - say 10°C)
About a month ago, the controller started throwing errors (low power mostly). I contacted the salesman who had supplied it and he put me onto a series of diagnostic youtube vids.
First approach was to lift the pump and separate the pump from the motor. There was no resistance turning the pump. The motor is firm to turn by hand - I not sure what "normal" feels like, but it just feels like strong magnetic pole resistance.
The three pump windings all measure 1.2 Ohms (so no problem there)
Following the test procedure, it was confirmed four of the six power FETs had failed (taking out two phases).
I ordered a dozen new FETS, but as they were coming from the UK (to Oz), I ordered a replacement controller too. The new controller arrived first, so was put into service. It worked perfectly for ten days before also failing (different error this time, but same effect) - this time three FETs failed - one on each phase.
Anyone else had similar fun with these pumps?

Many chinese manufacturers are using the same controller box. Not sure if they are the same inside of not.
For anyone with an electronics interest, the FETs are: IRFB4127
It worked well for two years and then the controller failed.
The pump is 3ph which is generated from the (DC only) controller which has a few user configurable parameters, but is mostly locked down.
The supplied controller is rated 150V max input. My PV setup is 3s2p providing 106V on a cold morning dropping to 100V in full sun (cold is a relative term - say 10°C)
About a month ago, the controller started throwing errors (low power mostly). I contacted the salesman who had supplied it and he put me onto a series of diagnostic youtube vids.
First approach was to lift the pump and separate the pump from the motor. There was no resistance turning the pump. The motor is firm to turn by hand - I not sure what "normal" feels like, but it just feels like strong magnetic pole resistance.
The three pump windings all measure 1.2 Ohms (so no problem there)
Following the test procedure, it was confirmed four of the six power FETs had failed (taking out two phases).
I ordered a dozen new FETS, but as they were coming from the UK (to Oz), I ordered a replacement controller too. The new controller arrived first, so was put into service. It worked perfectly for ten days before also failing (different error this time, but same effect) - this time three FETs failed - one on each phase.
Anyone else had similar fun with these pumps?

Many chinese manufacturers are using the same controller box. Not sure if they are the same inside of not.
For anyone with an electronics interest, the FETs are: IRFB4127
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