Number of Phases

Specification
Updated 2026-08-24 · Read this page as Markdown

Whether the inverter delivers single-phase or three-phase alternating current on its output. It must match the building's supply, and above a certain power level the network operator normally requires three-phase connection.

Single-phase is the norm for smaller domestic systems; three-phase is standard for larger installations, for most commercial connections, and for many European homes that already have a three-phase supply. Two practical points follow. First, a large single-phase inverter unbalances the network and many distribution operators cap single-phase generation at a defined limit. Second, in a house with three-phase supply and single-phase generation, whether self-consumption is netted across all three phases depends on the meter and on local rules — get that confirmed before sizing, because it changes the economics.

This spec across the catalog

Recorded on 70 models in this database. Most common values:

  • 3 ×40
  • 1 ×30
Advertisement

Related terms

Hybrid Inverter A grid-tied inverter that also has a battery port and the control logic to charge and discharge storage, deciding moment by moment whether solar energy goes to the loads, to the battery or to the grid. Many hybrids can additionally supply a protected circuit during an outage. Inverter Type The architectural class of the unit: string inverter, microinverter, hybrid or off-grid. The type determines where it sits in the system, what it can be connected to, and whether it can work without a grid present. Microinverter A small inverter mounted behind an individual solar module that converts that module's DC output directly to grid-frequency AC. Modules are then connected in parallel on an AC trunk cable instead of being wired into a DC string. Off-Grid Inverter An inverter that creates its own AC network from a battery bank rather than following an existing grid, supplying loads in an installation with no utility connection. It is also called a standalone or battery-based inverter. Transformerless Inverter An inverter that converts DC to AC without a galvanic isolation transformer between the array and the grid. Removing the transformer raises efficiency and cuts weight and size, and it is the dominant design in modern residential equipment.

See also

All glossary terms Guides Compare models
Advertisement