POLYENERGY utilizes ETAP software for the Battery Sizing Studies.

The ETAP Battery Sizing analysis module, being in compliance with IEEE Standard 485-1997 provides the user with a powerful tool for determining the number of strings, number of cells, and cell size of a battery for a designated duty cycle. The number of cells is determined to satisfy the maximum system voltage during the battery charging period and the minimum system voltage during the battery discharging period. The number of strings and cell size is determined to provide sufficient power to the load cycle considering the minimum system voltage and the minimum operating temperature. Battery Sizing Analysis Software also considers different factors that affect battery performance, such as design margin, aging compensation, initial capacity, and temperature, etc.

The ETAP Battery Discharging Analysis module provided the user the capability to accurately verify the performance of an existing or a sized battery. The module calculates the battery capacity, voltage, current, and output power as the battery discharges through a duty cycle. The battery duty cycle can be calculated from either load current summation or load flow calculations. When the battery duty cycle is calculated from load flow, the Battery Discharging Analysis also provides bus voltage and branch power along with battery output results. Several correction factors used in battery sizing calculation, such as battery temperature, aging and initial capacity, can also be considered in the battery discharge calculations.

Sizing & Discharge analysis module capabilities

  • Compliance with IEEE 308, 485, & 946 Standards
  • Integrated AC, DC, & Control System Diagram
  • Battery discharge simulation
  • Battery sizing
  • Discharge via DC load flow or duty cycle summation
  • Voltage drop & loss consideration
  • Class 1E DC power & control system models
  • Simulation of control system with battery discharge voltage
  • Duty cycle diversity factor
  • Load model type per operating characteristics
  • Battery duty cycle calculated from individual loads
  • Options for battery & load duty cycle 1 minute span
  • Multiple user selected options for battery characteristic interpolation
  • Multiple diversity & correction factors
  • Battery sizing report in IEEE 485 Standard format
  • Plot battery capacity, voltage, & current
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