diy solar

diy solar

water pump sizing

kranyan

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Joined
Oct 18, 2022
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Can a 4KW 380V triphase solar pump inverter adjust itself to run a 2HP tiphase 380V water pump with 8 solar panel of 450W (vmp 40.96, Voc 49.28) giving that this inverter input dc is 250-780VDC and recommended Voc is 620-750.or I will need more solar panels.



Thank you.
 
I've experimented a bit with these, though they were single phase. Three phase is suposed to work better. I think they need more input than an ordinary "solar pump". I was using about twice the pump capacity in PV panels, so you should have enough capacity there. If you put all PV panels in series, you'd have 8x41 = app 328Vdc input, Voc max is about 394V. Not ideal but I expect it will work OK, though it will probably run at less than max capacity quite a bit of the time, which translates in loss of pressure/head. So if you have the pump working close to it's maximum pressure/head then it might disappoint.
 
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