Most homes typically use single-phase power. Three-phase power is often used in industrial locations because three phases can transmit more power and is used to power large equipment.
If three-phase power is used at the installation site, it is best to choose a three-phase inverter; if single-phase power is used, it is best to choose a single-phase inverter.
Most homes typically use single-phase power. Three-phase power is often used in industrial locations because three phases can transmit more power, generate more electrical energy for direct use, and are used to power large equipment. Compared with manufacturing single-phase transformers of the same capacity, manufacturing three-phase transformers saves materials, has simple structure and excellent performance.
So what are single-phase and three-phase? What are the voltages of various types of electricity used daily?
- Single-phase inverter
The inverter converts DC power into AC output. Single-phase inverter converts the output AC voltage into a single phase, such as AC 220V or 230V.
There are three jacks at the interface of the single-phase inverter, marked “N”, “L” and “PE” respectively:
L means Live Wire (the logo letter is ‘L’ Live Wire) with red or brown wire;
N represents the neutral wire (the logo letter is ‘N’ Neutral wire) with blue or white wire;
PE represents the ground wire (the logo letter is ‘E’Earth) with yellow and green lines.
- Three-phase inverter
Three-phase inverter converts the output AC voltage into three phases, such as AC 380V or 400V. Three-phase electricity is composed of three AC potentials with the same frequency, equal amplitude, and phase differences of 120° from each other.
The interface of the three-phase inverter has five holes, namely A, B, C, N, and PE. Phase A is yellow, phase B is green, phase C is red, N represents the neutral line, use a blue or white line; PE represents the ground wire, use a yellow and green line. A, B, C may also be L1, L2, L3; U, V, W.
A simple summary is: 5-hole interface, 400V voltage level.
When installing a three-phase inverter, we often hear three-phase four-wire and three-phase five-wire. After talking about “phase”, let’s talk about “line”. The common types are as follows:
Single-phase two-wire: one live wire + one neutral wire.
Single-phase three-wire: one live wire + one neutral wire + one ground wire.
Three-phase three-wire: three live wires, mostly lines above 10KV.
Three-phase four-wire: three live wires + one neutral wire, mainly 380V/220V (400V/230V) low-voltage lines. The working neutral wire N doubles as the grounding protection wire PE, which can be called the protective neutral wire, represented by NPE, applicable It is suitable for power consumption places where the three-phase load is basically balanced.
Three-phase five-wire: three live wires + one neutral wire + one ground wire, a power supply system that strictly separates the working neutral wire N and the dedicated protective wire PE. It is used in places with high safety requirements and electrical equipment required to be grounded.
Generally, single-phase grid-connected inverters are connected to single-phase two-wire or single-phase three-wire grid lines.
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