2.1 General The BBS shall provide the following operational modes when operating on battery power: • Full operation of all traffic signal devices • Flash operation • Combination of full and flash operation 2.2 Run Time The BBS shall provide a minimum of 8.0 hours of full-time operation with a 450-watt load. The minimum battery size requirement is listed in section 7.0, Battery Type. 2.3 Compatibility The BBS shall be compatible with Model 332, 336, and 337 cabinets; the ITS cabinet; model 170 and 2070 controllers and any NEMA style cabinet and enclosures; the advanced transportation controller; and all cabinet components for full time operation. 2.4 Output Capacity The BBS shall provide a minimum of 1100W/1100VA@25°C active output capacity with 83 percent minimum inverter efficiency with 30% minimum loading. 2.5 Output Voltage When operating in backup mode, the BBS output shall be 120VAC ± 2%, pure sine wave output, ≤3%THD, 60Hz ± 0.3 Hz. 2.6 DC System Voltage The BBS DC system voltage shall be 48VDC nominal.
