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Technical Reference Battery Performance

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Technical Reference Battery Performance ( technical-reference-battery-performance )

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Battery Performance Definitions Power Derating is the decrease in nominal net output power for the system and is equal to the rate of power drain from the battery. For example: if the battery is being drained at a rate of 1kW, then the MicroTurbine will require 1kW of power to recharge it. This power will not be available for the load. Transient Interval is the time between the start of successive transients. Output Power Power Delta Transient Interval Time Transient Size (or Power Delta) is the total change in load for the transient. Battery Use in Stand Alone Systems Battery performance varies between C30/C60/C65 high pressure and C30 low pressure (and liquid fuel) systems as described in the paragraphs below. Model C30 (and C60/C65) High Pressure System The most demanding period of operation for the battery is when the MicroTurbine is changing from one power level to another. During positive step loads (increase in power level) the generator must increase speed to provide more power to the load. During this step, the battery provides power to assist the engine increase in speed, as well as supplying power for the load via the BCT (C30) or BCM (C60/C65). During negative step loads (decrease in power level) the generator must decrease the speed to provide less power to the load. Excess energy from the engine is sent to the battery pack (and brake resistor if necessary). Model C30 Low Pressure and Liquid Fuel System Low pressure and liquid fuel system battery usage is equivalent in most respects to the high pressure system. The fuel compressor requires additional power during transients and therefore adds additional load to the battery. The amount of additional load is not significant for small transients but is significant for larger transients. 410044 Rev. B (February 2006) Page 2 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.

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