# Battery rack

Canonical URL: https://eloragrid.ai/symbols/battery-rack
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: BR
Drawing use: SLD
Reference families: IEC, IEEE / ANSI, Manufacturer

A rack of series-connected battery modules with its own switchgear and battery management unit, forming one DC source.

## In plain English

### What does Battery rack mean?

In stationary lithium-ion systems a battery rack holds modules connected in series to form one string, together with a rack-level switchgear box containing contactors, fuses, precharge circuit and the rack battery management unit. Racks are then paralleled onto a DC bus feeding the power conversion system.

### A simple example

Single-line diagrams draw each rack as a battery symbol within a boundary box that also contains the rack contactors and fuse, with the management unit shown as a small block linked by a communication line. Large systems may show one typical rack and note the number of racks in parallel.

### What the drawings help you do

The rack boundary on an electrical drawing does not describe mechanical arrangement, fire separation or cooling. It also does not state whether racks of different capacities can be mixed, which the battery manufacturer must confirm.

### This particular reference

A rack of series-connected battery modules with its own switchgear and battery management unit, forming one DC source. A rack is the packaged string with switchgear and management; a plain battery string symbol shows only the series cells.

### Terms

- DC: Direct current: electricity flowing in one direction.
- Normally open / normally closed: The contact state in the normal condition defined for the drawing.
- 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.

- [xStorage battery energy storage system](https://www.eaton.com/us/en-us/catalog/energy-storage/xstorage-battery-energy-storage-system.html)
- [Lynx Smart BMS NG official product and documents](https://www.victronenergy.com/battery-management-systems/lynx-smart-bms-ng)


## What it represents

In stationary lithium-ion systems a battery rack holds modules connected in series to form one string, together with a rack-level switchgear box containing contactors, fuses, precharge circuit and the rack battery management unit. Racks are then paralleled onto a DC bus feeding the power conversion system.
Single-line diagrams draw each rack as a battery symbol within a boundary box that also contains the rack contactors and fuse, with the management unit shown as a small block linked by a communication line. Large systems may show one typical rack and note the number of racks in parallel.
The rack boundary on an electrical drawing does not describe mechanical arrangement, fire separation or cooling. It also does not state whether racks of different capacities can be mixed, which the battery manufacturer must confirm.

## How to read it

- One typical rack is often drawn with a multiplier note for the rest.
- Rack contactors are opened by the management system, not by the inverter.

## Information to show or reference

- State modules per rack and rack voltage.
- Show rack contactors, fuses and precharge.
- Reference number of racks in parallel.

## Important distinction

A rack is the packaged string with switchgear and management; a plain battery string symbol shows only the series cells.

## Facts

- Contents: Modules, switchgear, management unit
- Electrical role: One parallelable DC string
- Preview: Independent educational illustration; not a product outline

## Public references

- [xStorage battery energy storage system](https://www.eaton.com/us/en-us/catalog/energy-storage/xstorage-battery-energy-storage-system.html) — Eaton. Public battery energy storage cabinet context.
- [Lynx Smart BMS NG official product and documents](https://www.victronenergy.com/battery-management-systems/lynx-smart-bms-ng) — Victron Energy. Public battery management and contactor control documentation context.

## 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.