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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Battery Performance Calculation of Battery Life Expectancy How the Calculator Works To obtain an estimate for battery life, the Expected Cycle Life hours should be multiplied by three factors; Temperature Derating, Starts Derating and End of Life Rating. Each of these values is determined from the appropriate chart. This will give an estimate of battery life in Stand Alone operating hours. The basic format for this calculation is: Expected life = Cycle Life * Temperature Derating * Starts Derating * End of Life Derating What you will need to know: this data is required before a life estimate can be calculated. • System type • Transient Size in Watts • Transient interval in seconds • Ambient temperature in °C • Number of starts in 1 year • Maximum transient required for the application Step 1: Find the appropriate Expected Cycle Life Chart for the System. High and low pressure systems require different amounts of energy for transients, so find the appropriate chart to obtain data in Figure 2 “Expected Cycle Life”. Step 2: Find the Number of Operating Hours using Transient Size and Transient Interval. Using Figure 2 “Expected Cycle Life”, the size of transient required is found on the y-axis. The value of the transient interval is found on the x-axis. Where these points intersect, the number of operating hours can be read from the chart. If the point lays between two lines then the number of operating hours from the left most line should be used (the lowest number). The maximum that should be used for any calculation is 26280 hours. Use 5 years (43800 hours) for standby, dual mode or emergency generator applications. Step 3: Find the Operating Temperature of the Battery. Using Figures 3 and 4 “Battery Temperature Increase”, find the temperature increase over ambient. Find the appropriate line for the Transient Size, and the Transient Interval on the x- axis. The Temperature increase over ambient can be read from the y-axis on the chart. Add this value to the ambient temperature to get the battery temperature during operation. Step 4: Find the Temperature Derating of the Battery. Using Figure 5 “Temperature Derating for Battery Life”, find the battery temperature on the x- axis and read the derating from the y-axis. This number is multiplied by the number of hours from Step 2. Step 5: Find the Number of Starts Derating. Approximate the number of starts that the MicroTurbine will have in a one-year period. Find this number on the x-axis on Figure 6 “Derating for Number of Starts” and read the corresponding value from the y-axis. This number is multiplied by the number of hours in Step 2. Number of Starts Derating is eliminated from the calculation for standby applications. 410044-001 Rev. A (October 2003) Page 4 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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