July 9, 20242 yr 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.
July 9, 20242 yr 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.
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