I am in need of a 15 HP pump but I only have 120/240V 1-Phase service. The VFD size that I need is 30hp 3-phase, which will provide enough current for a 15hp 208vac 3 phase motor using single phase input. My cost for a Yaskawa brand VFD in a NEMA 1 enclosure is $2153. Another option is to go with a 15 HP single-phase pump, which I have only one price so far at $4,190, which is almost twice the price of a much-more-common 15 HP 3-phase pump. I'm still pursuing pump prices from other vendors. Notice that NEC 1-Phase motor charts only goes up to 10HP! Maybe I should go with the VFD. If the motor needs to be replaced down the road, a 15HP 3-PH motor would be a lot easier to find, and will cost much less. I have two identical systems involved, so this is a big decision for me.
