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BBS Battery Options and Run Time Calculations
 
Step 1 - Determine the power requirements for each intersection using either  Table 1 for a LED ONLY intersection or Table 2 for an intersection that includes YELLOW and/or PED incandescent lamps.
 

Table 1 - Power Calculation for a LED ONLY Intersection
ITEM DESCRIPTION UNIT POWER watts (a) QTY. (b) TOTAL POWER  (a)x(b)
1 12" LED Signal Head (note 1) 11 to18    
2 8" LED Signal Head (note 1) 8 to 13    
3 12" LED Arrow Signal Head 8 to 10    
4 LED Pedestrian Head 8 to 20    
5 Signal Controller 120 to150 1  
6 Other Equipment      
      TOTAL  
 

Note 1: Count each three (3) section Signal Head as one unit.
 

Table 2 - Power Calculation for mixed LED/Incandescent Intersection
ITEM DESCRIPTION UNIT POWER watts (a) QTY. (b) DUTY CYCLE % (c) TOTAL POWER   (a)x(b)x(c)
1 12" Signal Head  (note 2) 21 to30      
2 8" Signal Head (note2) 18 to 25      
3 12" LED Arrow Head 8 to 10      
4 Incandescent Arrow Head 67 to 144      
5 LED Pedestrian Head 8 to 20      
6 Incandescent Ped. Head 67 to 144      
7 Signal Controller 120 to150 1    
8

Other Equipment

        
 

TOTAL

        
  

    Note 2: Use this chart when yellow incandescent lamps are present. Count each three (3) section Signal Head as one unit.
  
GENERAL NOTES:
  • The ideal method to determine intersection power demand is to measure it. If this option is not available, the tables above will provide an approximate power demand calculation for purposes of BBS model selection below.
  • If incandescent lamps exist within the intersection configuration, you should use both the continuous power rating of the BBS and the wattage of the incandescent lamps to select the correct product below.
 
 

BBS Battery Options and Run Time Calculations
 

Step 2 - Select the Correct Power Backup System
CONTINUOUS POWER (Note 1) INCANDESCENT LAMP POWER (Note 2) CONTROLLER TYPE BBS MODEL SELECTION
Less than 1100 Less than 1000 170 or 2070 24Y11 or 24M11
Less than 1100 Less than 1000 NEMA 24J11 or 24M11
Less than 1700 Less than 2500 170 or 2070 48Y17 or 48M17
Less than 1700 Less than 2500 NEMA 48J17 or 48M17
  1. Continuous Power (watts) at 25°C ambient temperature.
  2. Use total incandescent lamp power (watts) at 100% duty cycle.                        

Step 3 - Select the Correct Battery Configuration
TOTAL INTERSECTION POWER (watts)  (2) model 390003 (2) model 390006 (4) model 390003 (4) model 390006
79AH @ 24VDC 105AH @ 24VDC 158AH @ 24VDC 79AH @ 48VDC 210AH @ 24VDC 105AH @ 48VDC
300 3 hrs 45 min 5 hrs 32 min 9 hrs 14 min 12 hrs 54 min
400 2 hrs 33 min 3 hrs 44 min 6 hrs 32 min 9 hrs 12 min
500 1 hr 55 min 2 hrs 46 min 4 hrs 49 min 7 hrs 2 min
600 1 hr 29 min 2 hrs 11 min 3 hrs 45 min 5 hrs 32 min
700 1 hr 11 min 1 hr 48 min 3 hrs 3 min 4 hrs 30 min
800 59 min 1 hr 29 min 2 hrs 33 min 3 hrs 44 min
900 50 min 1 hr 15 min 2 hrs 12 min 3 hrs 11 min
1000 43 min 1 hr 4 min 1 hr 55 min 2 hrs 46 min
1100 38 min 56 min 1 hr 41 min 2 hrs 27 min
1200 N/A N/A 1 hr 29 min 2 hrs 11 min
1300 N/A N/A 1 hr 19 min 1 hr 58 min
1400 N/A N/A 1 hr 11 min 1 hr 48 min
1500 N/A N/A 1 hr 5 min 1 hr 37 min
1600 N/A N/A 59 min 1 hr 29 min
1700 N/A N/A 54 min 1 hr 21 min
All stated run times are estimated for an ambient temperature of 25°C. Actual run times may vary with each unique implementation based on frequency of use, condition of batteries, and temperature. Switching to RED FLASH at 40% battery level will significantly extend run time.