INV/CHG
Bidirectional inverter-charger
A battery converter that charges from an AC source and inverts back to AC, with an internal transfer relay for the load.
SLD / Schematic
Symbols · INV 2x120
Split-phase inverter
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.
- 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.
Read the source: MultiPlus-II 2x 120V official product and documents · Inverters product listing
SLD / Schematic · INV 2x120
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.
A distinction that matters
A split-phase inverter produces two antiphase legs; a three-phase inverter produces three legs 120 degrees apart.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
MultiPlus-II 2x 120V official product and documents
Public split-phase inverter-charger documentation.
Inverters product listing
Public inverter product listing.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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