BASIC SOLAR PV TRAINING · Resistance Resistance limits the flow of electrons through the wires,...
Transcript of BASIC SOLAR PV TRAINING · Resistance Resistance limits the flow of electrons through the wires,...
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BASIC SOLAR PV TRAINING
1Climate Resilient Low Cost Buildings in Marsabit County Project, 2018
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How is electricity generated from the
Sunlight?
SunlightPhotons
Solar Panel (photovoltaic (PV) module)
Electrons
Electricity
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Basic solar system for a home
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Source KEREA 2012
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Parts of a solar system
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Source KEREA 2012
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Types solar panels
Source KEREA 2012
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Source KEREA 2012
Types solar panels cont..
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Batteries
Source KEREA 2012
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Batteries cont..
Source KEREA 2012
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Source KEREA 2012
Batteries cont..
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Charge Controllers
Source KEREA 2012
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Source KEREA 2012
Inverters
Inverters convert direct current (DC) power into alternating current (AC) power
The power stored in the batteries is in form of DC and this needs to be converted to AC to be used by electrical
appliances.
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Basic concepts of electricity
Current
Voltage
Resistance
Power
Watt and Watt Hour
Ohm’s law
Power law
Alternate current (AC)
Direct current (DC)1
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Current
Electricity flow can be compared
to water flow
Current is the quantity of
electrons flowing inside wires
(conductors)
Symbol: ‘I’ Unit: ‘A’ (ampere)
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Voltage
Voltage is the electrical potential, or
the pressure that moves electrons
through the wires (conductors) and
can be compared to pressure in a
water pipe
Voltage is the electric potential
difference between two points
Symbol: ‘V’. Unit: ‘V’ (voltage)
Positive (+)
TerminalNegative (-)
Terminal
Positive (+)
Terminal (raised
button)
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Resistance
Resistance limits the flow of electronsthrough the wires, like a nozzlerestricts the flow of water through apipe
Smaller pipes restrict water flow, justlike smaller wires restrict electricalflow (higher resistance)
Longer pipes also restrict water flow.Similarly, the longer the wires, thehigher the resistance
Lower resistance
Higher resistance
Higher resistance 7
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Resistance
Resistance is the opposition
to the passage of an electric
current
Symbol: ‘Ω’ Unit: ‘Ohms’
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Ohms law
Current, Voltage and Resistance
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Power
Power can be thought of as a
stream of water, which has
both pressure and flow rate
Power is derived from voltage
(V) multiplied by current (I)
P = V x I
Symbol: ‘P’ and Unit: ‘W’(watt)
1V x 4A = 4W 2V x 2A = 4W
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Electricity Summary
Current symbol: ‘I’, unit: ‘A’ (ampere)
I = V / R
Voltage symbol: ‘V’, Unit: ‘V’ (voltage)
V = I x R
Resistance symbol: ‘Ω’ and Unit: ‘Ohms’ R = V / I
Power symbol: ‘P’ and Unit: ‘Watt’ P = I x V
Energy symbol: ‘E’ and Unit: ‘Watt hour’ E = P x t
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Power & Energy
If the 20W module is used to charge a
battery for 5 hours per day
Total energy generated per day is 20
W * 5 hours = 100 Watt-hours (Wh)
If the 60W bulb is used for 5 hours a
day
Total energy used per day is 60 W * 5
hours = 300 Watt-hours (Wh)20 W Power Generation
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Example: Solar water pumping.
Source KEREA 2012
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Source KEREA 2012
What can Solar Power do?
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END
Well-done!!