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DEFINITION
A stand alone so photovoltaic street lighting system comprises a
compact fluorescent lamp, lead acid battery, PV module(s) control
electronics, inter-connecting wires / cables, Module mounting
hardware, Battery box, Operation, instruction and maintenance manual.
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DUTY CYCLE
The system should be designed to automatically switch ON at dusk.
operate through out the night and automatically switch OFF at the
dawn. under average daily insolation of 5 kwh/sq.m. on a horizontal
surface
- LAMP
- The lamp will be of compact fluorescent
(CFL) type, either 4 - Pin or 2 Pin type, with a rating of 11W. For
the 4 - Pin type CFL. adequate pre-heating circuit must be
provided.
- The light output from the lamp should be
around 900 +5% lumens Also please see (iii) of V given below.
- The lamp should be housed in a weather
proof assembly suitable for outdoor use, with a reflector on its
back. While fixing the assembly, the lamp should be held in a base
up configuration.
- BATTERY
- Flooded electrolyte type positive tubular
plate. low maintenance lead acid battery
- The battery will have a minimum rating of
12V 75 Ah (at C/10) discharge rate.
- 75 % of the rated capacity of the battery
should be between fully charged & load cut off conditions.
- CELECTRON
- The inverter should be of quasi sine wave/sine wave type. with frequency in the range o 20 - 35 KHz.
Half-wave operation is not acceptable.
- The total electronic efficiency should be
at least 80 %
- No blackening or reduction in the lumen
output by more than 10% should be observed after 1000 ON/OFF
cycles (two minutes ON followed by four minutes OFF is one cycle)
- The idle current consumption should not be
more than 10 mA
- Electronics should operate at 12 V and
should have temperature compensation for proper charging of the
battery through out the year.
- Necessary lengths of wires/cables and fuses
should be provided.
- The PV module will be used to sense the
ambient light level for switching ON and OFF the lamp
- PV MODULE (S)
- The PV module(s) shall contain crystalline
silicon solar cells
- The power output
of the module(s) under STC should be a minimum of 74 W Either two
module; of minimum 37 W output each or one module of 74 W output
should be used
- The operating voltage corresponding to the
power output mentioned above should be 16.4 V.
- The open circuit voltage of the PV modules
under STC should be at least 21.0 Volts
- The terminal box on the module should have
a provision for opening for replacing the cable if required
- A strip containing the following details
should be laminated inside the module so as to be clearly visible
from the front side.
a) Name of the Manufacturer or distinctive Logo
b) Model or type No
c) Serial No
- ELECTRONIC PROTECTIONS
- Adequate protection is to be incorporated
under no -load conditions e.g when the lamp is removed and the
system is switched ON.
- The system should have protection against
battery overcharge and deep discharge conditions.
- Fuses should be provided to protect against
short circuit conditions.
- A blocking diode should be provided as part
of the electronics, to prevent reverse flow of current through the
PV module(s), in case such a diode is not provided with the solar
module (s)
- Full protection against open circuit
accidental short circuit and reverse polarity should e provided
- MECHANICAL HARDWARE
- A metallic frame structure (with corrosion
resistance paint) to be fixed on the pole to hold the SPV
module(s) The frame structure should have provision to adjust its
angle of inclination to the horizontal between 0 and 45, so that
the module(s) can be oriented at the specified tilt angle
- The pole should be made of mild steel pipe
with a height of 4 metres above the ground level, after grouting
and final installation. The pole should have the provision to hold
the we proof lamp housing It should be painted with a corrosion
resistant paint.
- A vented, acid proof and corrosion
resistant painted metallic box for outdoor use should be provided
for housing the battery.
- OTHER FEATURES
- The system should be provided with 2 LED
indicators a green light to indicate charging in progress and a
red LED to indicate deep discharge condition of the battery. The
green LED should glow only when the battery is actually being
charged
- There will be a Name Plate on the system
which will give
a) Name of the Manufacturer or Distinctive Logo
b) Serial Number
- Components and parts used in the solar
street lighting systems should conform to the latest BIS
specifications, wherever such specifications are available and
applicable.
- The PV module(s) will be warranted for a
minimum period of 10 years from the date of supply and the street
lighting system (including the battery ) will be warranted for a
period of two years from the date of
supply
The Warranty Card to be supplied with
the system must contain the details of the system supplied. The manufacturers can also
provided additional information about the system and conditions of
warranty as necessary.
- An Operation Instruction and Maintenance
Manual, in English and the local language should be provided with
the solar street lighting system
The following minimum details must be provided in the Manual
- About Photovoltaics
- About solar street lighting system - its
components and expected performance
- About PV module
- About CFL
- About battery.
- Clear instructions about erection of pole
and mounting of PV module and lamp housing assembly on the pole.
- About electronics.
- About charging and significance of
indicators
- DO’s and DON’T’s,
- Clear instructions on regular maintenance
and trouble shooting of the solar street lighting system.
- Name and address of the contact person in
case of non-functionality of the solar street lighting system
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