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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Battery Performance Performance Limits Battery performance is limited by two main factors during cycling. One is the limit at which the battery can recover charge. The charging voltage and current limits are set in the BCT and BCM software, and are a function of battery design. The second limit is the battery temperature. During cycling, the battery increases in temperature from internal resistive losses. The temperature must be limited due to the plastic case of the battery, which will become soft and fail if it reaches a high temperature. These battery performance limits must be calculated into total system power derating. Refer to the Model C30/C60/C65 Performance Technical Reference manuals (410004/ 410005/410048) for additional factors. This calculation for the electrical limits of the battery is based on the time period required to replace lost charge after a transient cycle and the rate at which it is replaced. To find the system power derating, the transient size and transient interval are required. Deratings are additive for a cycle with more than one size of transient. The upper limit for this derating is based on the maximum charging rate and voltage limit set in the software. This limit is therefore equivalent to the maximum discharge rate, allowed for the battery, so that it is not depleted. The limits are: 248.4V * 12.8Amps = 3179 Watts. The 1-hour overload limit is calculated to allow the battery to discharge 30% within the one hour while the BCT is attempting to charge the battery. The calculation is then: 30% of battery energy = 13Ahr * 12V * 18 cells * 30% = 842 Watt-hours. Two examples are provided below to demonstrate calculations for electrical power derating. See Figures 8 and 9 for power derating curves. Example 1 • 30kW HP natural gas turbine operating at a maximum temperature of 35°C has a temperature-derated output of 24kW. The expected load has a 5kW transient every 40 seconds. • From the Figure 8, find 40 seconds on the x-axis and point to where it intersects the 5000W line. Read the derating data directly from the y-axis. The power derating is 2000 Watts. • Net system output is 24kW – 2 kW = 22kW Example 2 • 5kW transient every minute + 15 kW transient every 2 minutes • Derating = 1200 W + 1000 W = 2.2kW 410044-001 Rev. A (October 2003) Page 12 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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