Date: 18th March 2015
Revision: 1st

Introduction

Most manufacturing facilities use battery powered equipment such as fork lifts and maintenance carts

These facilities will use load banks to test these batteries on a regular basis. Bad batteries can impact productivity and damage equipment.

Manufacturers of load bank equipment usually provide a volt meter and a current meter on each load bank. By monitoring current and voltage at specific resistive load will indicate whether a battery or bank of batteries is good.

The voltage is general measured across the load and the current is measured using a current shunt on the low side of the load. Shunts are typically 50mv or 100mv output

 

 

Diagram

application-note-load-bank-1

Example

The Load Bank tests six 12 volt batteries in series. 72 volts total. Under load, a voltage below 70 volts indicates an issue.

The load is sized to draw 300 amps from the batteries. A current below 290 amps indicates an issue. The system uses a 300 amp to 50mv shunt.

 

APM-VOLT

application-note-load-bank-2

 

APM-SHNT

application-note-load-bank-3 application-note-load-bank-4