Download - Working of ¨solar pv vs generators¨
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““Solar Energy Systems Solar Energy Systems (Photovoltaics) in (Photovoltaics) in
comparison with the comparison with the conventional Generators”conventional Generators”
Prepared by: Hassan Ahmed,System Engineer,AE Department,Welt Konnect
(Basics)(Basics)
Document # AE-KHI-PDO-0002
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Scope of the PresentationScope of the PresentationReasons of the Presentation:– Being a part of the Alternative Energy Department, one
should have basic know-how about the working of the systems it deals in.
– To acquire basic knowledge about How Solar Energy System (Photovoltaic) works?
– To be able to take part or engage in conversations related to working of Solar Energy systems.
– This presentation is purely to understand the technicality of the Photovoltaic.
Why Generator:– Because we all are familiar with a conventional Generator
and it is easy to learn something by comparing it to a familiar object.
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A Conventional GeneratorA Conventional Generator
So we can tell the client:“Here is your 1 KW Generator for your 1 KW Load”.
1 kW Generator
Generates 1 kW continuously
1 kW Appliance
Consumes 1 kW continuously
Fuel
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The The Ideal ConditionIdeal Condition for a Solar Panel for a Solar Panel
“IF” this condition were true we would have told the client:“Here is your 1 KW Solar Panel for your 1 KW Load”.
1 kW Appliance
Consumes 1 kW continuously
90˚Mr. Sun
Generates 1 kW continuously
1 kW Solar Panel
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What Actually HappensWhat Actually Happens• A Solar Panel does not generate its Peak Power through-out the day.• The Power Generation at a specific time depends on the position of
the sun at that time.
1 KW Peak Power Solar Panel
500 500
800W 800W
1 kW
EastWest
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Equivalent Sun Hours (Insolation)Equivalent Sun Hours (Insolation)
1 kW Solar Panel
500
800W
1 kW
EastWest
500
800W
10 Hrs.
90˚
Insolation depends purely on the Location and season eg, Karachi has average 5.44 hrs of Insolation.
But total Energy Generated in 10hrs. = 5 kWH
A Perpendicular Sun would have Generated this Energy (5 kWH) in
5 hrs. only.
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How much Solar Panels do we need for How much Solar Panels do we need for our Appliance ?our Appliance ?
• The answer is we calculate Energy per day.
1 kW Appliance
Runs 10 Hrs. per Day
1 kW * 10 Hrs. = 10 kWH per Day
So Energy consumed is,
1 KW Solar Panel
Equivalent Sun Hrs. : 5 Hrs.
So Energy generated is,1 kW * 5 Hrs. = 5 kWH per Day
Conclusion: Energy req. = 10 kWHEnergy gen. = 5 kWH
So, Number of Panels required = 2
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Battery Back-up & Other AccessoriesBattery Back-up & Other Accessories
• The Energy is Generated by a Solar Panel only during day-time.
• Even during day-time, Generation is non-uniform.• However we might need to run the appliance
during night and during a cloudy day as well and at uniform power.
• For these reasons we use Batteries to store Energy and provide when required.
• We use Charge controllers and inverters to provide desired and uniform power to the appliance.
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ConclusionsConclusions
• A Photovoltaic system does not generate continuous Power like a Generator.
• Photovoltaic systems are specified in terms of Energy Consumption and Generation per Day.
• Solar Panel Output depends upon the Location and Season as well.
• Batteries and other accessories are added to the system depending upon the type and usage of the load(appliances).
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FormulaeFormulae
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Thank YouThank You