CHG
Battery charger controller
A battery charger controller manages the charging process for the selected battery system.
Schematic
Symbols · BC
Float and boost battery charger
A rectifier charger that holds a stationary battery at float voltage and can apply a higher boost or equalise voltage.
In plain English
What does Float and boost battery charger mean?
A float and boost charger is the rectifier that maintains a stationary battery, typically for switchgear tripping supplies, telecom or a microgrid DC bus. In float mode it supplies the standing DC load and a small trickle current, while boost or equalise mode raises the voltage to recharge the battery quickly after a discharge or to equalise lead-acid cells.
A simple example
Drawings show a rectifier block with an AC input breaker, DC output to the battery and the DC distribution board, and often a blocking diode or dropping diode chain to keep load voltage within limits during boost. Alarm contacts for charger failure, earth fault and low voltage are drawn on the control schematic.
What the drawings help you do
The symbol does not state the current limit, whether the charger alone can carry the full load without the battery, or temperature compensation of float voltage. These matter for sizing and for battery life, so they must be in the specification.
This particular reference
A rectifier charger that holds a stationary battery at float voltage and can apply a higher boost or equalise voltage. A station charger is a power rectifier supplying load and battery; a battery charger controller is an integrated circuit inside smaller equipment.
- 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: Skylla-IP65 official product and documents · DC UPS, AC UPS and capacitor buffer modules
SLD / Schematic · BC
What it represents
A float and boost charger is the rectifier that maintains a stationary battery, typically for switchgear tripping supplies, telecom or a microgrid DC bus. In float mode it supplies the standing DC load and a small trickle current, while boost or equalise mode raises the voltage to recharge the battery quickly after a discharge or to equalise lead-acid cells.
Drawings show a rectifier block with an AC input breaker, DC output to the battery and the DC distribution board, and often a blocking diode or dropping diode chain to keep load voltage within limits during boost. Alarm contacts for charger failure, earth fault and low voltage are drawn on the control schematic.
The symbol does not state the current limit, whether the charger alone can carry the full load without the battery, or temperature compensation of float voltage. These matter for sizing and for battery life, so they must be in the specification.
How to read it
- Look for voltage-dropping diodes that protect loads during boost charging.
- Check whether two chargers share one battery for redundancy.
Information to show or reference
- State float and boost voltages and current rating.
- Show AC supply, battery and load connections.
- Reference alarms and temperature compensation.
A distinction that matters
A station charger is a power rectifier supplying load and battery; a battery charger controller is an integrated circuit inside smaller equipment.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Skylla-IP65 official product and documents
Public battery charger documentation context.
DC UPS, AC UPS and capacitor buffer modules
Public DC supply and UPS function context.
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.
Explore related references
BT
ANSI/IEEE battery symbol
IEEE-style multi-cell battery drawn as alternating long and short plates, with polarity marked, for American drawing sets.
IEEE / ANSI
DC
Battery charger
A battery charger maintains a specified battery supply or starting battery system.
GA objects
UPS DC
DC uninterruptible power supply
A DC UPS maintains a documented DC load supply during a specified input interruption using an associated energy store.
SLD / Schematic
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.