Soft start vs. full voltage start of pump motors S117
- It is generally believed that a full-voltage start on pump motors will significantly increase an electrical bill compared to soft starts, or Star Delta, Wye Delta, etc., because of the power spike.
- Most of the time this is not true. The normal demand change is based on a high average kW reading taken over a 15- to 30 minute time frame. The power spike at full voltage start up is only 1 to 2 seconds .
- The soft starts generally experience 50 to 70 percent of the power spike of Full Voltage, for a duration of 3 to 7 seconds.