The Basics of Solar Lighting Systems • Mean solar radiation

The Basics of Solar Lighting Systems
• Mean solar radiation
received at the surface,
expressed in W/m2.
• It oscillates between a
maximum of 275 W/m2, in
the cloudless regions of
the Sahara and Arabia, up
to a minimum of 75 W/m2
in the misty isles of the
Arctic.
• The global mean is 170
W/m2.
Economics of Solar Lighting
• Economical solution for:
– non-grid areas or areas where power
would need to be reticulated for lighting
only
– Areas where power is generated by diesel
generators
– Where power supply is limited
Solar based Exterior Lighting
systems
Solar based Exterior Lighting systems
Central system,
Solar power stations
supply individual
luminaires
Decentralised
system,
Every luminaire has
its own solar power
generation and
storage unit
Criteria for a
decentralised system
• Well designed, balanced system
• Reliability
• Battery accessibility
• Luminaire efficacy
• Lamp lifetime
• Theft / Vandal resistance
Many systems are offered by
manufacturers all over the world:
Our competitors:
Our competitors:
Our competitors:
Our competitors:
Our competitors:
Our competitors:
The principals of Solar Lighting Systems
Solar panels need to be
overdesigned in Africa, since
prolonged periods of drought are
causing dust layers which decrease
the efficiency of the panels.
The principals of Solar Lighting Systems
• The Battery
– Typically at 105Ah capacity
– Low maintenance, lead acid
battery
– Life time of 4 years, provided
that the battery is not
discharged by more than 20% of
its capacity per night.
– Does not suffer from memory
effect
The principals of Solar Lighting Systems
The Regulator regulates the
flow of current from the solar
panel to the battery during
daytime and from the battery
to the luminaire at night time.
•
It prevents the battery from
overcharging and deep
charging.
•
It acts as a daylight sensor,
since it will sense the low
current flow from the Solar
panel and will switch the
luminaire to the battery.
The principals of Solar Lighting Systems
LED Luminaire
Regulator
CFL Luminaire
Regulator
Inverter / ECG
BEKA-Solar unit
BEKA-Solar unit
BEKA-Solar unit
BEKA-Solar unit
AMBAR 3 – 43W LED
• On 8m pole
• Powered by 165W Solar
panel
• Storing energy in 2 *
105Ah batteries
• Up to 35-38m – Class B
Lighting Class
Light Output , over night
Output, %
100%
Level of lighting, if
operated througout
the night
80%
60%
40%
20%
18
19
20
21
22
23
24
1
2
3
4
5
6
Time of night
BEKA’s OptiPower® Unit
for solar powered LED light sources:
Output, %
150, %
140%
120%
100%
Level of lighting, if
operated througout
the night
80%
60%
40%
20%
18
19
20
21
22
23
24
1
2
3
4
5
6
Time of night
Adapts the lighting
output to the
requirements of the
society it serves.
This enables higher
lighting levels at
peak periods.
Economics of Solar Lighting
Typical applications:
• Providing Lighting in Off-grid areas, like:
– Nature reserves
– Eco Estates
– Rural areas
People’s Solar Box
Designed to provide power for
basic services to people in off-grid
areas.
The product consists of:
• 20W Solar Panel
• Blue Box, containing:
• Battery
• Controller
• Fuses for Outlets
• 5 outlets for LED lights
• 1 outlet for 12V adaptor,
powering:
• Mobile Phones
• Laptops
NEW: PEOPLE’s SOLAR BOX
• Designed for quick and easy
installation.
• Allows mounting of the LED
lights in different configurations,
like:
• Wall mounting
• Ceiling mounting
• Suspended mounting
• Suitable for interior or
exterior use.
• Solar based exterior lighting has become a
very important part of BEKA’s product range
• BEKA to be the reliable technology
partner for any quality solar installation
Questions ?