June 13, 20233 yr What are the consequences of using a single-phase inverter in a three-phase supply. How do you then figure out and counter for the power imbalance between phases? Is such a system legal? Question background: Installing an 8kVA Sunsynk Inverter (1-Ph) to a 3-Ph Supply. With a PV supply of 6.6kWp (12x 550W JA Solar) and a battery storage of 10kWh. Edited June 13, 20233 yr by Mzamo
June 13, 20233 yr Hi @Mzamo I have a three phase supply from City Power but only use one of the phases for my house and have a single phase inverter. It is not an issue. Prior to getting my inverter my house was running on all three phases but it was very easy for my installer to convert to a single phase supply.
June 14, 20233 yr If you are running 3 phase equipment then a problem can occur, but most don't run that sort of equipment and really only need a single phase. Most Grid suppliers will tell a installer which phase they would prefer the inverter to be installed on so they can balance the phases. With 3 phase and some equipment a difference of a small number of volts between the phases can cause havoc hence the reason why they choose where it goes. Some companies are allowed to test the phases and then add to the lowest phase but this will depend on your area. Most simply convert there whole house to run on a single phase (the same phase as given above) as it's a lot easier and never have to worry about balance issues and makes things simpler for all parties envoled.
June 14, 20233 yr Author 8 hours ago, Webbie said: If you are running 3 phase equipment then a problem can occur, but most don't run that sort of equipment and really only need a single phase. Most Grid suppliers will tell a installer which phase they would prefer the inverter to be installed on so they can balance the phases. With 3 phase and some equipment a difference of a small number of volts between the phases can cause havoc hence the reason why they choose where it goes. Some companies are allowed to test the phases and then add to the lowest phase but this will depend on your area. Most simply convert there whole house to run on a single phase (the same phase as given above) as it's a lot easier and never have to worry about balance issues and makes things simpler for all parties envoled. I had a look at the NRS 097-2-3:2023 regulation regarding such an install but did not understand how one could check that "the power unbalance between phases does not exceed 4.6kVA". Thanks for the enlightment
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