Kilowatt Power Posted July 9 Share Posted July 9 Greetings, A site has 123/ABC (CW) phase rotation coming from utility. Wiring at the main incomer MCCB changes the phase sequence to 321/CBA (CCW) for the entire building. A 25kW grid-tie inverter with 25kWp solar synchronises to the 321 phase rotation after the main MCCB. It has been working for a little over a year off-setting between 40-60% of the total 12-20 kW daytime load. Is it worth swapping phases A & C at the bottom input of the main MCCB to match the grid phase rotation? This will definitely disturb the phase sequence already established for the two three-phase motors and passenger elevator. Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted July 9 Share Posted July 9 56 minutes ago, Kilowatt Power said: Greetings, A site has 123/ABC (CW) phase rotation coming from utility. Wiring at the main incomer MCCB changes the phase sequence to 321/CBA (CCW) for the entire building. A 25kW grid-tie inverter with 25kWp solar synchronises to the 321 phase rotation after the main MCCB. It has been working for a little over a year off-setting between 40-60% of the total 12-20 kW daytime load. Is it worth swapping phases A & C at the bottom input of the main MCCB to match the grid phase rotation? This will definitely disturb the phase sequence already established for the two three-phase motors and passenger elevator. If it ain't broken don't fix it. By changing now means other changes as well. Quote Link to comment Share on other sites More sharing options...
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