HYB INV
Hybrid inverter
A single inverter with PV, battery and AC ports, combining MPPT charging, battery inversion and backup output.
SLD
Symbols · 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.
In plain English
What does Bidirectional inverter-charger mean?
An inverter-charger contains one bidirectional power stage between a battery and an AC output, together with an internal transfer relay connecting the AC input to the output when a valid source is present. With the source available it passes power through and charges the battery; without it, it opens the relay and inverts from the battery.
A simple example
Drawings show a converter box with DC and AC marks, a bidirectional arrow, an AC input from the grid or generator and an AC output to the load. The transfer relay may be drawn inside the boundary as a changeover contact, and some units have a second output that drops during battery operation.
What the drawings help you do
The symbol does not show the internal neutral-earth relay many units use when inverting, which matters for earthing and residual current device operation. Power assist settings, which let the inverter add battery power to a limited generator supply, are also invisible on the drawing.
This particular reference
A battery converter that charges from an AC source and inverts back to AC, with an internal transfer relay for the load. An inverter-charger has an internal transfer relay and charger; a plain DC-to-AC inverter only converts battery power to AC.
- DC
- Direct current: electricity flowing in one direction.
- AC
- Alternating current: electricity whose direction changes periodically.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
Read the source: MultiPlus-II official product and documents · Quattro official product and documents
SLD / Schematic · INV/CHG
What it represents
An inverter-charger contains one bidirectional power stage between a battery and an AC output, together with an internal transfer relay connecting the AC input to the output when a valid source is present. With the source available it passes power through and charges the battery; without it, it opens the relay and inverts from the battery.
Drawings show a converter box with DC and AC marks, a bidirectional arrow, an AC input from the grid or generator and an AC output to the load. The transfer relay may be drawn inside the boundary as a changeover contact, and some units have a second output that drops during battery operation.
The symbol does not show the internal neutral-earth relay many units use when inverting, which matters for earthing and residual current device operation. Power assist settings, which let the inverter add battery power to a limited generator supply, are also invisible on the drawing.
How to read it
- Look for the internal transfer relay and any neutral-earth relay.
- Check whether a second output is shed on battery operation.
Information to show or reference
- State inverter VA, charger current and battery voltage.
- Show AC input, outputs and earthing arrangement.
- Reference input current limit settings.
A distinction that matters
An inverter-charger has an internal transfer relay and charger; a plain DC-to-AC inverter only converts battery power to AC.
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 official product and documents
Public inverter-charger product and document page.
Quattro official product and documents
Public dual-input inverter-charger documentation.
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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