I have been in a debate with our EOR about when we will need to have a neutral on our solar PV sites. I understand that there are inverters that may need a neutral for sensing purposes
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A 3-phase load, like a 3-phase electric motor, uses electricity from all 3 phases. The neutral does not have a function because the 3 electrical circuits will keep each other balanced.
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ral, Safety, and Grid Connections”: “Basis of the Neutral Connection in the SG125HV: The neutral connection on grid tied PV inverters is not necessary as PV inverters are balanced 3-phase current
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Eliminating the Neutral: Some three-phase string inverters do not require a neutral conductor to operate. This is due to the fact that PV inverters typically output balanced three-phase power, many allow the
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If there is a break in the neutral, the Phase-to-Phase voltages will be unaffected, but Phase to Neutral will vary, because the neutral has lost its reference to the star point. This is what is called a ''Floating
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I intend to connect the phase of the inverter AC output at the knife switch in place of one of the grid three phases (the same used to supply AC input to the inverter).
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If the inverter is exporting balanced three phase power to the grid without a neutral, the grid can still supply line to neutral power because it does have a neutral.
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Original post follows a residential/commercial solar installer told
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Original post follows a residential/commercial solar installer told me that they install 3 phase solar inverters, that connect to the end user building (residential, commercial) with 3 wires, i.e.
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If the AC line is connected incorrectly, the power inverter will probably be unable to be started, some protection functions will miss, but the inverter will not be damaged.
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