SLB-Series Constant Current DC Load Banks with Wireless Cell Monitoring

Model # SLB-Series

Eagle Eye’s SLB-Series SMART Constant Current DC Load Banks are designed for acceptance testing, discharge testing, battery capacity testing, battery maintenance, engineering examination and other battery cell testing for DC power with load. The SMART technology allows a constant current discharge without the need for manual adjustment of current during the discharge test. Our SLB-Series battery load testers are portable, durable, economical, safe, easy-to-use and come complete with our DataView software, providing the user with a complete data management and analysis program.

The SLB-Series has over 35 standard DC load bank models allowing it to meet your system's requirements in a variety of industries. Standard DC Voltages (nominal) include: 12, 24, 36, 48, 80, 125, 240, 380, 480 VDC. Current ranges are 0-600 Amp. Two DC load banks can connect in parallel for a larger discharge range. Custom solutions are also available. Supported industries include utilities, telecommunications, UPS, motive power, transportation, CATV, and many more.

  • Specifications
  • FAQs
  • Benefits
  • More Info

Technical Specs

Cell Voltage:Standard DAC: 1.2V, 2V, 6V, 12V / Optional 3.6V, 4V, and other custom DAC configurations available upon request
Discharge Current Range:Single Load: 12 – 600A / Parallel Load: Up to 1200A
Discharge Voltage Range:Range: 10 – 576V (Max) / Voltage Steps: 12V, 24V, 36V, 48V, 80V, 125V, 240V, 380V, 480V
Accuracy:Discharge Current: 1% / Voltage: 0.5% – 0.8%
Resolution:Discharge Current: 0.1 A or 0.5% / Voltage: 0.001 V
Sampling Interval:5 seconds – 1 minute
Data Transfer:USB, Wireless (466 MHz)
Display:Backlit LCD
Operating Environment:0 – 40 °C (32 – 104 °F)
Power Requirements:110/220 VAC 50/60 Hz / DC (from connected batteries)
Dimensions:Small: 400 x 177 x 288 mm (15.7 x 7 x 11.3 in)
Medium: 520 x 202 x 355 mm (20.5 x 8 x 14 in)
Large: 555 x 225 x 435 mm (22.5 x 8.9 x 17.2 in)
X-Large: 603 x 400 x 740 mm (23.7 x 15.7 x 29 in)
XX-Large: 762 x 406 x 737 mm (30 x 16 x 29 in)
Weight:Small: 11 kg (24 lbs) Medium: 16 kg (36 lbs) Large: 21 kg (47 lbs) X-Large: 42 kg (93 lbs) XX-Large: 55 kg (122 lbs)


What are some common applications areas for this product?
Common applications include but are not limited to:

  • Power Utilities
  • Telecom/Communications
  • UPS Systems
  • Green Energy
  • Electronics
  • Battery Suppliers and Manufacturers
  • Government/Defense
  • Oil, Gas & Fuel
  • Motive Power
  • Medical/Biotechnology
  • Universities & Colleges

What is the importance of load testing?
Load testing is the only verifiable method to determine the actual capacity of your battery strings

What is the benefit of DAC monitoring?
As important as string load testing is, without individual cell monitoring you can’t identify why your string failed. DAC are vital to load testing because they capture each cell’s performance from beginning to end. This enables us to target weak cells for replacement. By replacing only weak cells we ensure a healthy string that remains in service longer. DACs also save money by allowing technicians to perform other duties instead of taking cell measurements every 15 minutes. This prevents user error, increases productivity, and gives us quality measurement data to make decisions.

How do the DACs function?
DACs are connected to the positive terminals of each cell by robust alligator clips. The clips connect to wiring harnesses which power the DACs. The DAC then wirelessly transfer the data to the SLB unit

What is the power requirement of the DAC and how much current do they draw?
DAC get their power from the batteries they are connected to. They require a minimum of 8V and use 30mA for operation

Does the SLB-Series come with software?
Each SLB comes standard with dataview software. This software allows us to live monitor, view test data, and export reports to Microsoft Excel

What if I do not have access to a PC while testing?
No problem! All cells and information can be viewed on the LCD screen of any SLB. Test data can be exported via USB flash drive then to PC for report creation

Are DAC compatible with any SLB?
Yes! DACs work with every SLB model

What is the life expectancy of the DAC?
Similar to all electronics life expectancy varies based on use and abuse. Our average lifespan for DAC is 5+ years!

Can DAC packages be purchased separately from my SLB?
Absolutely. Standard 48V/125V DAC kits can be bought anytime for pairing with an SLB. In addition, you can purchase extra DACs for testing on 1.2V systems

Is there a delay in communication from the DAC to software?
DAC data is captured in real-time and depending on distance from the tester, data is transmitted every 5-10 seconds

How is a discharge test stopped?
Testing can be stopped in various ways. The user is able to manually stop the test at any time. The test will auto-shutdown if any of (4) programmable parameters are met. These parameter settings are based on time, capacity, low string voltage, and low cell voltage. Each SLB is further equipped with safety features that will result in test shut down; overload circuit breakers and fused input VAC surge protection

Could the SLB be used with a different load bank?
Yes, the SLB can be used for several supportive duties by using the optional current clamp described below

Could the SLB be used in an online application?
Yes, although we always recommend that the SLB be used in offline applications. This is because an offline(disconnected) string prevents the impact of an active external load and protects the string from being overly discharged in the case of an outage event. This could cause system failure and catastrophic damage to the string

What is the power requirement for the SLB?
The exact power consumption of an SLB varies with model and discharge current, however expect the draw to be less than 9A at max current. A 15A circuit breaker is sufficient for power needs

What are the safety features of the SLB?
Please see ‘How is a discharge test stopped?’ for an overview of the safety features

How many tests can the SLB store?
The internal storage is 16MB. This generally will hold several tests. The exact amount will vary with different string sizes and discharge durations. We recommend transferring data to the software database after testing

How does the SLB communicate?
The SLB transmits data by RF at the frequency of 433M Hz

What is the optional current clamp used for?
The optional current clamp is used for special testing. Assistive discharge is most common. In this role the SLB is used to add supplemental current to another discharging non-SLB load bank. The SLB will measure the discharge from the external load bank and supply the necessary current to reach max discharge. In an external discharge test the SLB will act in a data logger capacity and record a discharge event. Finally, in charge monitoring the SLB acts in a data collection role to record cell voltages and float charge

When is the optional parallel cable used?
Parallel can be used between to SLB-Series load banks. It allows for a main unit to operate both machines to increase current output

How many batteries does a DAC connect to?
Depending on the battery type either 4 or 12 batteries. DACs can connect 12 1.2V, 2V, and 4V cells. 4 cells can be connected for battery types 6V & 12V

How many DAC/cells could be connected to one SLB?
One SLB can connect up to 600 cells. This amounts to either 50 1.2, 2, 4V DACS or 150 6V and 12V DACS. In other words, it should work for any conceivable application!


  • SMART Constant Current DC Load Banks with system and cell voltage monitoring
  • Data Management Software for data analyzing and reporting
  • Rugged, compact and portable unit with included carrying case
  • Alloy or PTC Ceramic resistors for safe discharging
  • Four settings for auto shut-down of discharge: discharge time, discharged capacity, cell cut-off voltage and total cut-off voltage
  • Continued discharge available when certain cell voltages reach cut-off value
  • Parallel connection of two units for mass discharge testing
  • Thermal cut-off and automatic overload protection
  • Auto sorting for lag-out batteries during discharge
  • Can be powered by AC or DC (from connected batteries for DC)
  • Safe circuits avoid damage to battery when testing
  • Included USB drive for convenient data transfer from load bank to PC
  • Optional Wireless communication for convenient discharge monitoring on PC with DAC Package
  • Optional Real-time display of voltage for each cell with DAC package
  • Optional External CT clamp to allow assisted discharge with external load sources or battery charge monitoring

More Info

Eagle Eye's SMART SLB-Series DC Load Banks come standard with monitoring of the system during discharge - as well as four (4) conditions to automatically stop the test. Optional DAC package allows the voltage of EACH CELL to be wirelessly recorded and displayed during discharge. The DAC package allows the user to evaluate the health of each cell and replace only the cells that require replacement - saving time and money by significantly reducing labor hours and replacement costs.

The included DataView software allows the user to create customized reports with company name, contact, testing location, battery manufacturer, model number, number of cells, and more. DataView reports provide the test criteria, list of weakest cells, graph of weakest cells, string information, individual cell information, time stamping, discharging graphs and an area to add notes. Eagle Eye also offers AC Load Banks for AC applications.

The SMART DC SLB-Series Includes:

  • SLB-Series Load Bank
  • DataView Management Software
  • Wheeled Carrying Case with Telescoping Handle (for Small & Medium models only)
  • Set of 3 m/10 ft Discharge Cables
  • Set of 3 m/10 ft Voltage Test Leads
  • PC Communication Terminal
  • USB to RS-232 Adapter
  • Grounding Cable
  • AC Power Cord
  • USB Flash Drive with Software & Support Literature
  • Set of Wireless Communication Antennas
  • Printed Quick Start Guide
  • Optional DAC Package for 1.2V/2V/6V/12V for Real-Time Wireless Monitoring Per Cell
  • Optional DAC Package for 12V Only for Real-Time Wireless Monitoring Per Cell
  • Optional External CT Clamp for Assistive or External Discharge Testing

Discharge testing is an essential practice for all critical backup battery preventative maintenance programs. Utility, UPS, Telecommunication, CATV/Broadband, Motive Power and other industries ALL utilize this practice to determine the true health of critical backup batteries. Load testing is the only form of battery testing that will determine the actual capacity of the battery string. Eagle Eye load banks are designed to make discharge testing convenient and easy for any application.

Load testing is a fixture in IEEE (450), (1188), (1106) and NERC (PRC-005-2) battery maintenance standards, and is critical for preventative maintenance across many industries. The financial risks that can occur due to plant downtime, personnel safety, and serious equipment damage are too severe to ignore load testing. Utilities have been load testing where preventative maintenance is required for NERC standard PRC-005-2. Every six calendar years it is required by PRC-005-2 to complete a capacity test of the battery bank for Vented Lead Acid (VLA) and NiCad batteries, and every three years for Valve-Regulated Lead-Acid (VRLA) batteries.

Load testing is increasingly popular in the motive power field to evaluate forklift batteries and to see how the batteries behave on a charge. Many forklift batteries go through an industry standard 6-hour discharge test. Eagle Eye's SLB-Series portable load banks make forklift battery testing easy and accessible.

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    SMART DC Load Bank with Monitoring
    Range: 12-480 VDC, 0-600A

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Companies We Serve
  • Interstate BatteriesCaribbean Utilities Company
  • Motive Energy TelecommunicationsAlpine Power Systems
  • Burbank Water and Power Hakai Energy Solutions
  • Purdue UniversityMotive Energy
  • EnersysEnersol