# Split-phase inverter

Canonical URL: https://eloragrid.ai/symbols/split-phase-inverter
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: INV 2x120
Drawing use: SLD, Schematic
Reference families: IEC, IEEE / ANSI, Manufacturer

An inverter with two 180-degree displaced outputs and a neutral, supplying 120/240 V split-phase installations.

## In plain English

### What does Split-phase inverter mean?

A split-phase inverter produces two AC outputs 180 degrees apart with a shared neutral, giving 120 V from each line to neutral and 240 V between lines. This matches North American residential and small commercial supplies, so the inverter can feed a standard load centre in off-grid or backup systems.

### A simple example

Drawings show the inverter block with three AC output conductors, L1, L2 and N, often with an internal or external autotransformer that balances unequal loads on the two halves. Neutral-earth bonding relays and the generator or grid input are drawn as for other inverter-chargers.

### What the drawings help you do

Unequal loading on L1 and L2 must be handled by the inverter or an autotransformer; otherwise one half can overload while the total rating appears adequate. The symbol does not show the per-leg current rating or the bonding arrangement.

### This particular reference

An inverter with two 180-degree displaced outputs and a neutral, supplying 120/240 V split-phase installations. A split-phase inverter produces two antiphase legs; a three-phase inverter produces three legs 120 degrees apart.

### Terms

- AC: Alternating current: electricity whose direction changes periodically.
- Winding: A coil of conductor inside an electrical machine or transformer.
- Coil: A wound conductor that can produce a magnetic field when energised.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [MultiPlus-II 2x 120V official product and documents](https://www.victronenergy.com/inverters-chargers/multiplus-ii-2x-120v)
- [Inverters product listing](https://www.victronenergy.com/inverters)


## What it represents

A split-phase inverter produces two AC outputs 180 degrees apart with a shared neutral, giving 120 V from each line to neutral and 240 V between lines. This matches North American residential and small commercial supplies, so the inverter can feed a standard load centre in off-grid or backup systems.
Drawings show the inverter block with three AC output conductors, L1, L2 and N, often with an internal or external autotransformer that balances unequal loads on the two halves. Neutral-earth bonding relays and the generator or grid input are drawn as for other inverter-chargers.
Unequal loading on L1 and L2 must be handled by the inverter or an autotransformer; otherwise one half can overload while the total rating appears adequate. The symbol does not show the per-leg current rating or the bonding arrangement.

## How to read it

- Read the per-leg rating as well as the total rating.
- Check for an autotransformer used for load balancing.

## Information to show or reference

- State total and per-leg ratings.
- Show L1, L2, N and bonding.
- Reference load balance between legs.

## Important distinction

A split-phase inverter produces two antiphase legs; a three-phase inverter produces three legs 120 degrees apart.

## Facts

- Outputs: L1, L2 at 180 degrees, neutral
- Voltages: 120 V line to neutral, 240 V line to line
- Balancing: Internal or external autotransformer
- Preview: Independent educational illustration; consult the applicable standard and project legend for the exact graphic

## Public references

- [MultiPlus-II 2x 120V official product and documents](https://www.victronenergy.com/inverters-chargers/multiplus-ii-2x-120v) — Victron Energy. Public split-phase inverter-charger documentation.
- [Inverters product listing](https://www.victronenergy.com/inverters) — Victron Energy. Public inverter product listing.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.