thekman
Electrical
- Sep 3, 2009
- 90
2HP hyd pump motor 230v 1phase. FLA 10A, reported inrush 53-63A. Customer wants a UPS on it - I found a 4kVA inverter rated for 12kVA surge for 20s. The ~14kVA inrush lasts only a second or so. I've been going back and forth with the mfr about it, he thinks it will burn out 'prematurely' and (obviously) wants me to get next larger UPS but it's 2X cost. I don't know exactly what 'prematurely' means here, a month or 14 years instead of 15. Am I wrong in thinking that the 12kVA/20s surge rated can handle 14kVA for 1s? 5%? My feeling is that its life may be reduced but insignificantly. I do not have the option of adding a VFD or a softstarter. I haven't looked at a SS contactor, but wouldn't that reduce the inrush a little?