# What is 120/240V split phase inverter

01/13/2023

The United States, Britain and Germany were the first three countries in the world to use electricity, and the United States was the first to adopt alternators and establish a 110 V grid.

Some neighboring countries and regions, such as Canada, Mexico, Cuba, Colombia, the Cayman Islands, as well as Japan and Taiwan, also adopted the standard of 110 V-120 V voltage.

Even though 220 V-240 V alternators were built after, these countries did not put to use this standard because of the high cost of replacing the power system.

To meet the electricity needs of citizens in different countries, single-phase inverters, split phase inverters and three phase inverters have also emerged. Below we will explain the differences between the three and recommend you a cost-effective split phase inverter.

Let's start with the concept of split-phase, a distribution system commonly found in North American countries and often mistaken for a two-phase system by the electrically un-attuned.

## What is split phase?

Split phase refers to the single-phase three-wire mid-point neutral power distribution system, which provide 120/240 Vac residential electricity.

In each pole mounted switching cabinet of streers or groups of properties, inside the transformer, there is a primary coil connected to the grid and a smaller coil that will be connected to the property, with the two ends of the secondary coil connected to the PROPERTY by two fire wires and the neutral wire connected to the center of the secondary coil.

The voltage between L1 and N and between L2 and N is 120V when measured with a multimeter, whereas when we connect the two fire wires with the multimeter leads, the voltage is 240V. Measured with respect to the neutral, the phase difference between L1 and L2 is exactly 180 degrees, but despite this, the split phase system is still a single phase system.

From the diagram above, it is clear that this is a series circuit, the currents flowing through them are in opposite directions with respect to the neutral, so the phase difference between them is exactly 180 degrees, but both voltage waveforms are in phase, or in step, with each other.

However, since a multi-phase system must determine a unique direction of phase rotation a split-phase system cannot produce a single pointing rotational magnetic field, so it is a single phase system.

## What is split phase inverter？

In North America, people's home outlets provide power at 110 volts sometimes described as 120 volts, because transmission losses and power drops can cause power stations to provide power at voltages between 120 and 110 volts, so most appliances in North American countries are rated at 120/110V.

And heavy industrial loads such as compressors, refrigerators and pumps use a phase-to-phase (Live to Live) voltage of 220/240Vac.

A split-phase inverter is a device that converts DC power generated by a generator, battery, or solar power system into 110/240V AC power for domestic and industrial power needs in North American countries.

### The best value split phase inverter

The split-phase inverter can meet the demand of 110V/240V, and with the development of technology, the inverter charger is designed to integrate charging, discharging and AC/DC power conversion in one, bringing more convenience to users. For PV power generation, PowMr Sunsmart 10K is such a cost-effective split-phase inverter.

The split-phase inverter equipped with L1, L2, N ports, and a PE port for those with ground protection. Connect the load to L1 and L2 to:

• Converter the DC power from the mains, solar panels and generator

• Get 240V electricity in split phase mode to run heavy industrial loads connected to L1 and L2

• Store excess power in the battery for emergencies

## What is single phase?

In addition to the single-phase three-wire system, the most common type of single phase electricity is a single phase two fire wire system (one fire wire and one netrual wire) used to distribute power in an AC supply, usually at a frequency of 50 or 60 hertz. The voltage of single phase electricity peaks twice in a cycle, and the instantaneous power is not constant.

### What is Single phase inverter?

Single-phase inverter is to convert the output AC voltage to single-phase, such as AC 220V or 230V. Usually, single-phase inverter has three interfaces, respectively labeled "N" "L" "PE ".

In single-phase mode, the output voltage of the split phase inverter provide 110V electricity to run the residential/light commercial applications.

Taking Sunsamrt 10K as an example, they can be considered as one firewire with the L1 and L2 being connected, which makes the split-phase inverter have no difference from the single phase inverter.

## One split phase inverter or paralleled pair of inverters?

Connecting two 220V single phase inverters in parallel do provide 110V AC power, but this is not a wise choice for the following reasons:

• You need to use two inverters, the cost of money and space are higher

• You need the load to the AC Output ports of the two separate units, that could get nasty as the current and voltage of the two branches are difficult to keep balanced.

So, to get 110V/240V electricity, it is more feasible to use a split-phase inverter.