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The fuel gas specifications are listed in the following table. Another way to meet the battery charging requirement is to initiate a manual recharge at least 30 minutes prior (but no longer than 4 hours prior) to shutting down the MicroTurbine. This will initialize an equalization charge while the system is under load and ensure that the batteries are well charged at the onset of cooldown, even if a flameout results during cooldown. Once manually recharged, the system can be down as long as six months without battery recharging. With a manual recharge initiated, the minimum up-time is 30 minutes. Should the battery voltage dip between 175 and 200VDC, the system may not start in StandAlone mode and will need to be grid- started and run above the minimum power level (or manual recharge initiated) in order to recharge the batteries. Below 175VDC, the batteries must be recharged using an external charger. Only Capstone-trained Authorized Service Providers are authorized to charge the batteries externally. The battery pack contains high voltage and lethal quantities of energy. Failure to observe these and other safety guidelines can result in serious injury and/or death. The following table outlines the MedBtu settings and minimum power levels for various Btu content fuels. Capstone Model 330 - Medium Btu Fuel MAXIMUM FUEL GAS TEMPERATURE 50°C (122°F) MINIMUM FUEL GAS TEMPERATURE GREATER OF 0°C (32°F) or 20°C (36°F) ABOVE THE PRESSURIZED DEW POINT MINIMUM GAS LINE PRESSURE (@ MAXIMUM FUEL GAS FLOW) 34.5 kPA (5 PSIG) MAXIMUM OPERATING INLET PRESSURE (@ GUARD FILTER) FUEL GAS FLOW, MAXIMUM (@1000 BTU/SCF HHV) FUEL GAS FLOW, TYPICAL @FULL LOAD (@1000 BTU/SCF HHV) MINIMUM FUEL GAS CALORIFIC VALUE (HHV) MAXIMUM FUEL GAS CALORIFIC VALUE (HHV) 103 kPA (15 PSIG) 6.5 NM3/HR 660 SCFH 4.0 NM3/HR 660 SCFH 36,500 kJ/ NM3 950 BTU/SCF 44,180 kJ/ NM3 1150 BTU/SCF System Fuel Settings, Minimum Power Limits, and StandAlone Battery Care The MicroTurbine system’s ‘MedBtu’ setting must be adjusted according to the Btu content of the incoming fuel. Btu content determines the minimum acceptable power level for the MicroTurbine. Flameouts may occur if the minimum power level is not observed. While no system damage results from flameouts, it is essential that minimum operating times be met on systems equipped with the StandAlone option. For StandAlone systems, no greater than one week of operation below the minimum acceptable power level may elapse before the system must be run above the minimum power level for at least one hour. Failure to meet this minimum requirement may result in permanent damage to the batteries. Range Btu/scf (kCal/NM3) MedBtu setting 350-700 (40-80) ‘low’ 700-970 (80-111) ‘med’ 970-1200 (111-137) ‘normal’ Minimum Power Level 15 kW 5 kW 0 kW Initiating Manual Recharge From the display: Enter password. Select manual recharge = YES From the serial (RS232) connection: Enter password. Enter ‘BATCHG=1’ 511340/1 Application Guide - Medium Btu FuelPDF Image | Elevation Derating
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