Batteries, DC Systems – Traditional Loads and New Expectations

This course presents important considerations when using flooded cell and gel cell batteries and battery chargers. During this course, participants complete worksheets to size batteries for eight-hour and 24-hour discharge durations with constant, random and intermittent loads. Participants also complete worksheets to size battery chargers for eight-hour and 24-hour battery recharge durations. Considerations include float, equalize and discharge voltages; battery aging; charging cycle efficiency; continuous, random, momentary and intermittent loads; DC load characteristics; and battery and battery charger capabilities.

Participants gain an understanding of battery energy density, determine the impact of discharge cycle and ambient temperature on battery sizing, and learn to match battery chargers to battery applications.

This course can be applied to the Electrical Engineering Certificate.

Who Should Attend

Project managers, engineers, supervisors, designers, technicians, analysts, contract managers, consultants, managers and others interested in or involved with DC systems.

Benefits and Learning Outcomes

  • Understand battery energy density.
  • Determine impact of discharge cycle and ambient temperature on battery sizing.
  • Learn to match battery chargers to battery applications.

Course Outline/Topics

  • Chapter 1: Battery Applications
    1. Control Power
    2. Emergency Power
    3. Standby Power
    4. Electric Vehicles – Cars, Trucks, and Forklifts
    5. Energy Storage
  • Chapter 2: Stationary Batteries
    1. Flooded Cell Lead Acid Batteries
    2. Valve Regulated Lead Acid Batteries
    3. Discharge Rate versus Discharge Time
    4. Battery Temperature Considerations
  • Chapter 3: Mobile Battery Considerations
    1. CCA (Cold Cranking Amps)
    2. RC (Reserve Capacity)
    3. C20 (20 hour capacity)
    4. Deep-Cycle Batteries
  • Chapter 4: Battery and System Voltage
    1. System Voltage
    2. Float Voltage
    3. Equalize Voltage
    4. Discharge Voltage
  • Chapter 5: Battery Load Cycle
    1. Continuous Loads
    2. Momentary Loads
    3. Random Loads
  • Chapter 6: Load Characteristics
    1. Microprocessors
    2. Lock Out Relays
    3. Circuit Breaker Trip and Close Coils
    4. Circuit Breaker Spring Charging Motors
    5. Motor Operated Air Break Switches
  • Chapter 7: Battery Sizing Calculations
    1. For Blackout Conditions
    2. For Battery Charger Replacement
  • Chapter 8: Battery Chargers
    1. Input Voltage and Power
    2. Output Voltage and Current
    3. Features
  • Chapter 9: Battery Charger Sizing Calculation
    4. Continuous Battery Load
    5. Rated Battery Amp-Hours
    6. Battery Loss Factor
    7. Desired Recharge Time
    8. Current Limiter Setting
    9. Margin
  • Chapter 10: Fuse and Connected Device Ratings
    1. AC Ratings versus DC Ratings
  • Chapter 11: DC System Performance
    1. High Voltage Conditions (Sustained, Battery Equalize)
    2. Low Voltage Conditions (Momentary, Battery Discharge)
  • Chapter 12: Battery Location
    1. Dedicated Rooms
    2. Common Areas
    3. Spill Containment
    4. Emergency Eye Wash
  • Chapter 13: Battery and Charger Alarms and Inspections
    1. Alarms
    2. Monthly Inspections
    3. Periodic Inspections
  • Chapter 14: Battery Testing
    1. Battery Capacity Testing
    2. Limited Discharge Testing
    3. Frequency of Testing
    4. Cell Observations during Testing
  • Chapter 15: Short Circuit Calculations
    1. Maximum Short Circuit Current
    2. Bolted, End of Circuit, Short Circuit Current
    3. Fuse Opening Time
  • Chapter 16: Peak Shaving and Energy Storage
    1. Quick Discharge – Grid Stability
    2. Sustained Discharge – Peak Shaving
  • Chapter 17: Electric Vehicle Charging
    1. At Home (Slow) Charging
    2. On The Go (Fast) Charging

Dates and locations to be announced.


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