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Rooftop Solar Panel installation and cost analysis in INDIA

  2. Table of Content Introduction to Solar Energy Solar Panels Solar Panel Systems Load and Cost Calculations Maintenance and Lifespan of Solar Panel Challenges 1 2 3 4 5 6
  3. Available throughout the year during day period Free renewable source of energy Solar cells have long life time Solar Energy Solar energy is a clean, inexpensive, renewable power source that is harness- able nearly everywhere in the world No Maintenance 1 2 4 3
  4. • India being a tropical country receives adequate solar radiation for 300 days, amounting at least 3000hrs of sunshine • Average intensity of solar radiation received on India is 200 MW/km square (megawatt per kilometre square). With a geographical area of 3.287 million km square, this amounts to 657.4 million MW Solar Irradiation in India
  5. Solar Panel Solar panel type Advantages Disadvantages Monocrystalline •High efficiency, performance •Aesthetics •Higher costs Polycrystalline •Low cost •Lower efficiency, performance Thin-film •Portable and flexible •Lightweight •Aesthetics •Lowest efficiency, performance To produce electricity, solar cells are made from a semiconducting material that converts light into electricity. Three types of solar panels are monocrystalline, polycrystalline, and thin-film panels.
  6. Solar Panel System On-Grid Solar System • Generate power when the utility power grid is available and must connect to the grid to function • They can send excess power generated back to the grid when you are overproducing so you credit it for later use Advantage: • Most cost effective to install • Can pay offsetting utility bills in 3-8 years Disadvantage: • These do not provide power during a grid outage
  7. Solar Panel System Off-Grid Solar System • Solar power can be stored batteries for use when the power grid goes down or if you are not on the grid. • Provide power to offset the grid power whenever the sun is shining and will even send excess power to the grid for credit for later use. Benefits: • Provides power for your loads when the power is down Downside: • Cannot be expected to provide power for all your loads since the cost and volume of batteries would be prohibitive
  8. Solar Panel Calculations • Basis of all calculations is polycrystalline off grid solar panel system • Sun light available only for 8hrs in a single day • Cost of solar panel varies consumer to consumer • Solar Panel used in calculations is 300W • Battery used in calculations is 200Ah • Taking 70% efficiency in calculations • Installation cost is also subjected to consumer Assumptions
  9. Load Calculations • Quantity and usage (hrs/day) are variables in calculations if you change them, automatically all other calculation will adjust themselves to the new value • Efficiency of solar panel system is taken as 30% • Number of solar panels needed is subjected to total usage or consumption Equipment Wattage Quantity Usage(Hrs/day) Watts(Hrs/day) TV 100 1 6 600 Refrigerator 400 1 8 3200 Fan 75 1 8 600 Tube Light (LED) 10 4 12 480 Laptop 40 1 6 240 Total 625 5120 UTILITIES LOAD CALCULATION Total Watts/hr 5120 Total Sunlight (Hrs) 8.22 Size of solar panel 622.933 System Inefficiency On Grid 30% System Inefficiency Off Grid 30% Required size of solar panel 809.813 Number of solar panels needed 2.70 Calculation for a Single day
  10. Cost Calculations • Typical 1KW solar panel system produces. 4-5KWh (Units) of electricity in a single day hence around 1200-1500 units throughout the year • The average cost of installation of rooftop 1KW off grid system is around Rs 70,000 - 80,000. • After leveraging 30% subsidy for on grid system, people just have to pay Rs 51,000 - 56,000 for installing a rooftop PV system. Total Watts(Hrs/Day) Back up days Batter Longetivity Actual Total Watts(Hrs/Day) Battery Voltage(V) Batteries Current(Ah) Watt Hour Capacity Batteries Needed Battery Requirement Calculation 5120 1 80% 2.67 6400 12 200 2400 Equipment Quantity Cost(Rs) Solar Panel Plates 3 9000 Batteries 3 10000 Inverter 1 25000 Installation Cost 1 5000 Approximate Cost Calculation Total Cost 24294 26667 25000 5000 80961Total Cost in Rs
  11. Maintenance and Lifespan of Solar Panel Assumptions • Solar panels have a lifespan of 25 years, do not require regular maintenance • Manual cleaning can be done to remove dirt particles deposited on the surface of panel • Output of solar panels degrades 0.8% by each passing year and only 80% power remains at the end of 25 years
  12. Challenges • Solar energy can not be used in night time • Government only gives subsidy to on-grid solar panels systems • Polycrystalline solar panels are not that efficient and monocrystalline panels are very costly • Bad weather and air pollution can hinder the performance of solar panel system • Lack of awareness about proper usage and benefits of solar energy
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