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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Battery Performance Step 6: Find the End of Life Derating The end of the battery life is determined by the maximum transient it will have to perform successfully. This may not be the same transient that is used for the cyclic calculations. This maximum transient will usually occur after startup, and may be similar to the maximum loading of the MicroTurbine in a given application. Find the Maximum Power delta, or Transient size in Watts on the x-axis on Figure 7 “End of Life Factor” and read the corresponding factor from the y-axis. This number will be multiplied by the number of hours (or years) in Step 2. See Figure 7 also for standby applications. Step 7: Calculate Lifetime of Battery. Multiply the number of hours from Step 2 by the factors from Step 4,5 and 6. The result is the number of operating hours or standby years expected before battery failure. Examples of Battery Life Calculation In examples 1 and 2, a Model C30 high pressure Stand Alone system runs daily with a 15 kW base load and 5kW transients every 10 minutes. In Example 3, a Model C60/C65 high pressure Stand Alone system runs as a standby generator. Data used for the three battery life calculation examples on the following page is presented as follows: Parameter Example 1 Example 2 Example 3 System Type Transient Size (Watts) Transient Interval (sec) Ambient Temperature (°C) Number of Starts in 1 year Maximum Transient (Watts) C30 HP 5000 Watts 600 seconds Average (day) = 22°C 200 15000 C30 HP 5000 Watts 600 seconds Average (day) = 29°C 200 15000 C60/C65 HP Average (day) = 35°C 45000 410044-001 Rev. A (October 2003) Page 5 of 16 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Battery Performance
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