A Solar Powered Traffic Signal Systems are the traffic signals
powered by solar consisting of cantilever and primary poles,
signal heads, signal aspects, pedestrian aspects, count down
timer, solar penal, controller (solar/grid charger: grid
controller), battery charged by SPV panels/grid connection.
The system should be of 14 hours operation and 10 hours
blinking per day and must be designed to operated as Hybrid
with solar and grid power. This should be designed to work for
fully automatic operation with facility for manual operation.
For auto-change-over from solar to grid and vise-versa
provision should be there for Hybrid power source integrating
50% solar and 50% grid power, preference will be for solar
energy only. In case the solar and grid both fails, system
should be self sufficient for 10 hours operation from fully
charged battery bank. There should be provision for charging
through solar and grid both so that during sun-less days the
grid power is utilized for charging.
operation mode should be UTO/ON/OFF BLINK.
configuration will be of 2(two) sets of signal heads per
road, one set of pedestrian signals per road and one count
down timer per road.
The signals/signal aspects should be
LET array, ultra bright type of lighting, suitable for
daylight viewing. The visibility of the signals should be 500
meters and above. These signals aspects should be having
enclosures of powder coated sheet metal with housing
compatible to NEMA 12-IP.66 standards, designed for LED design
life cycle of 10 years.
The signal heads required set of primary + secondary for each
road should have provision for mounting both vertically and
horizontally i.e. modular with Tilt and Rotate feature.
size should be of 300 mm dia provided ultra bright LED in
RED/AMBER & GREEN.
bright REED LED timers should be provided as count down
timer for residual time for green signal having 2-2.5 digits
with letter height of 150 mm and should be visible from 100
meters or more and of 99 seconds duration.
Pedestrian/free left signals should be of composite
Red/Green LED signal.
The DED LED
should be of 620-635 nm wave length. The amber LED should be
584-600nm and the Green LED should be of 500-530 nm. The
light intensity of the LEDs should be between 1650-6400 mcd.
The size of LED should be 5 mm. The designed life of the LED
should be 70,000 – 1,00,000 and the operating temperature
How a Solar
Traffic Signal works:
The signal controller
should be 24 VDC, 20Watt, PLC/Cicro Controller based solid
state switching device, designed, fully automatic with manual
operation provisions, site programmable. Timing with on-site
modification capability, compatible for Rs.232/Rs.422-442 and
optional CP interface for 14 hours operation and 10 hours
blinking per day. This should also be capable for
synchronization, remote monitoring and control. The
enclosure/housing should be or powder coated sheet metal dust
and rain proof painted with moisture resistant fluorescent
anti corrosive paint. The signals/system should be capable of
meeting future up gradation and synchronization. The system up
time should be greater than 98%.
source should be in multiples or solar photovoltaic modules of
Multi Crystalline Silicon PV modules of 12V, 70-80 Wp (MNRE
approved). The system voltage should be 24 VDC. Suitably
designed for 50% contribution.
The Solar Charger should be suitably designed to perform at 24
Volts/15-30 Amperes, with a separate provision of Grid Battery
Charger operating at 24V, 10Amps.
The Battery Bank:-
should be of sealed maintenance free, Lead Acid type, suitable
for back up of `10 hours operation with maximum 80% depth of
discharge. The Battery capacity should be 24V, 80-125 Ah or
Grid Input Power:-
The Grid input power should be single phase 50Hz
230 V Ac, suitable for grid charger 24V/10Amp.
Cantilever poles on main roads and vertical poles
for side roads 6.2 meters and 5 meters above ground level
respectively. To facilitate withstanding against heavy loads
400x400x1200mm and 400x400x900mm respectively with M 200 P.C.
grouting below ground level excluding the length above ground
level the poles should be provided with necessary lugs and
The Poles should be of suitable thickness to withstand heavy
wind and of 140mm M.S. pipe with suitable cantilever supports
wherever necessary for bands, and should be painted with
Moisture Resistant Fluorescent anti corrosive paint of VIOLA
Blue colour with enamel finish.
Battery & Junction Boxes:-
The Battery Box and Junction Boxes of MS Sheets
painted with moisture resistant fluorescent anti corrosive
paint should be provided or, else these should be provided
made of ABS plastic.
Inter connecting cable and control cable should not
be other than copper with PVC installation and of suitable
size of 0.5-1.50 Sq mm the cores shall accordingly be provided
taking the no. of channels into account. The cables in
trenches shall be around with G.I. wire