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.