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DESIGN OFF GRID SOLAR SYSTEM
Presented By-
Pindoriya Rajesh M
D15041
Under Guidance By-
Prof. Ramesh Oruganti
IIT Mandi
Contents
Aim of project
Motivation
Introduction: Off-grid solar system
Introduction: On-grid solar system
How the solar sy...
 Aim of project:- Day by day the price of solar
panels falls gradually, but still, installation of a
complete off-grid so...
Introduction: Off-Grid Solar System
http://brisbanesolarinformation.com.au/
On-Grid Solar System:
 On-grid means solar system is tied to local utility
company’s system.
 On-grid systems are linked...
Solar Panel
DC Breaker &
Meter
Charge
Controller DC Load
BatteryMeter
DC Breaker
AC Load AC Breaker
Inverter
How the solar...
Mounting
Solar panels
Inverter
Batteries
Charge controller
Components of Off-Grid
Solar System
Basic Steps to Installation Off-Grid Solar PV System for Our Home
http://brisbanesolarinformation.com.au/
Step 1: Calculat...
Electric heater Air conditionerElectric furnaceRefrigerators
Small loads LED lamp LED street lamp
Introduction:
Types of l...
Step 1: Calculate total DC loads
How to convert AC loads to DC loads.
DC loads= AC Loads/Inverter efficiency
Step A: Deter...
Days of Autonomy:
The amount of time (days) the system can operate on battery
power alone with no input from other generat...
Step 3: Solar Panel Selection
 Solar panels are generally rated under standard test
conditions (STC): irradiance of 1,000...
 A solar charge controller is a device which is placed between a solar panel and a battery.
 It regulates the voltage an...
Step 5: Inverter Selection
Inverter Types
1. Square Wave
2. Modified Sine Wave
3. Pure Sine Wave (SPWM)
 Square wave inve...
Step 6: Mounting the Solar Panel
 After designing the solar system, buy all the components with
appropriate rating as per...
 We are interested to know how much energy is produced by our
solar panel or how much energy being consumed by our
applia...
Pros Cons
No electricity bills We will need a room to store large solar
batteries and a battery bank
No electric rate hike...
Solar Power Now a Reality at Jaipur Railway Station
 Jaipur railway station's rooftop installed
solar panels produced 260...
Conclusions
 Solar energy is a resource that is not only sustainable for energy consumption, it is indefinitely renewable...
Thanks for your attention
Any Questions????
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Design off grid solar PV system

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How to calculate total house loads, battery bank capacity, solar panels and finally how to mounting solar PV panels on roof top of home.

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Design off grid solar PV system

  1. 1. DESIGN OFF GRID SOLAR SYSTEM Presented By- Pindoriya Rajesh M D15041 Under Guidance By- Prof. Ramesh Oruganti IIT Mandi
  2. 2. Contents Aim of project Motivation Introduction: Off-grid solar system Introduction: On-grid solar system How the solar system fit together How to choose all components Pros and cons of off-grid solar system Conclusions
  3. 3.  Aim of project:- Day by day the price of solar panels falls gradually, but still, installation of a complete off-grid solar system is costly due to lack of knowledge and information.  An off grid or stand along solar PV system is when solar PV system is not connected to the utility grid and we are producing own electricity via solar is called off-grid solar system.  I decided to choose this project on how to get all the components for our solar system separately and assemble it all by myself. Aim of Project & Motivation Reference: http://carboncycle2.lbl.gov/research/focus-areas/photovoltaic-solar-cells/
  4. 4. Introduction: Off-Grid Solar System http://brisbanesolarinformation.com.au/
  5. 5. On-Grid Solar System:  On-grid means solar system is tied to local utility company’s system.  On-grid systems are linked with power utilities, which enable the home to use the power generated by the solar system as well as power from the local utility.  These systems can also feed power back into the grid during times of low usage and high production.  Being grid-tied is beneficial because we don’t have to buy an expensive battery back-up system to store any excess energy. Introduction: On-Grid Solar System Reference:http://www.leonics.com/system/solar_photovoltaic/solar_grid_tie_system/solar_ grid_tie_system_en.php
  6. 6. Solar Panel DC Breaker & Meter Charge Controller DC Load BatteryMeter DC Breaker AC Load AC Breaker Inverter How the solar system fit together. For an off-grid solar system we need four basic components:- 1. Solar Panel (PV Panel) 2. Charge Controller 3. Inverter 4. Battery
  7. 7. Mounting Solar panels Inverter Batteries Charge controller Components of Off-Grid Solar System
  8. 8. Basic Steps to Installation Off-Grid Solar PV System for Our Home http://brisbanesolarinformation.com.au/ Step 1: Calculate home load (AC+DC loads) Step 2: Battery Selection Step 3: Solar Panel Selection Step 4: Charge Controller Selection Step 5: Inverter Selection Step 6: Series and Parallel Connection Step 7: Mounting the Solar Panel
  9. 9. Electric heater Air conditionerElectric furnaceRefrigerators Small loads LED lamp LED street lamp Introduction: Types of loads 1. Basic Loads 2. Large appliances 3. Special loads Basic Loads Large appliances Special Loads
  10. 10. Step 1: Calculate total DC loads How to convert AC loads to DC loads. DC loads= AC Loads/Inverter efficiency Step A: Determine average daily DC load in watt- hours AC average daily load (Wh/day) Inverter efficiency DC average daily load Wh/day Average daily DC load Wh/day 2000 /0.92 +100 = 2273 Reference:- www.altestore.com Leff= 𝑻𝒐𝒕𝒂𝒍 𝑫𝑪 𝒍𝒐𝒂𝒅𝒔 𝑩𝒂𝒕𝒕𝒆𝒓𝒚 𝑽𝒐𝒍𝒕𝒂𝒈𝒆 Battery bank capacity= 𝑳𝒆𝒇𝒇∗𝑫𝒂 𝑫𝑶𝑫∗𝑭𝒕 Where; Da: Days of autonym, DOD: Depth of discharge Ft: temperature function Leff= 𝟐𝟐𝟕𝟑 𝟐𝟒 = 95.05 Ah/day
  11. 11. Days of Autonomy: The amount of time (days) the system can operate on battery power alone with no input from other generation sources (PV, and generator). DoD (Depth of discharge): Measure of maximum capacity to be withdrawn from a battery. - Common basic sizing guid:50% - Discharge only 10-20% to maximize battery life - Inverse to SoC (State of charge) - 50% DoD= 50% SoC Step 2: Size of Battery Bank Step B: Determine battery bank capacity (Ah) Leff. (Ah/Day) Daily of autonomy Battery temp. multiplier Discharge limit Battery bank capacity Ah 95.05 *3 days /1.19 /0.50 = 479.245  The rated capacity is taken to be specified at 25°C with a C/20 discharge.  At higher discharge rates, the capacity will be lower and vice versa.
  12. 12. Step 3: Solar Panel Selection  Solar panels are generally rated under standard test conditions (STC): irradiance of 1,000 W/m², solar spectrum of AM 1.5 and module temperature at 25°C.  During the 12hr day time the sunlight is not uniform, and it also differ according to our location on the globe.  So we can assume 5 hours of effective sunlight which will generate the rated power.  So total power output of Panels = 24V * 479.245 Ah = 11 kWh  Power to be generated per hour = 11000 / 5= 2.2 kW
  13. 13.  A solar charge controller is a device which is placed between a solar panel and a battery.  It regulates the voltage and current coming from solar panels.  It is used to maintain the proper charging voltage on the batteries.  As the input voltage from the solar panel rises, the charge controller regulates the charge to the batteries preventing any over charging. Step 4: Charge Controller Selection Rating of Charge Controller:  Since our system is rated at 24 V, the charge controller is also 24 V.  Current rating = Power output of Panels / Voltage = 2200 W / 24V = 91.67 A  So choose a Charge Controller of 24 V and more than 91.67 A.
  14. 14. Step 5: Inverter Selection Inverter Types 1. Square Wave 2. Modified Sine Wave 3. Pure Sine Wave (SPWM)  Square wave inverters are the cheapest but not suitable for all appliances.  Modified Sine Wave output is also not suitable for certain appliances, particularly those with capacitive and electromagnetic devices such as: a fridge, microwave oven and most kinds of motors.  Typically modified sine wave inverters work at lower efficiency than pure sine wave inverters.  Mostly SPWM type inverter use in off grid solar system. Rating of Inverter  The power rating should be equal or more than the total load in watt at any instant.  In our case the maximum load at any instant = A.C. (630 W)+ Refrigerator (530 W) + T.V. (200W) + Fan (6*80W) + CFL (6*11W) = 2000 W  By taking some margin we can choose a 2000 W inverter.  As our system is 24 V we have to select a 24V DC to 230V/50Hz AC pure sine wave inverter.
  15. 15. Step 6: Mounting the Solar Panel  After designing the solar system, buy all the components with appropriate rating as per the previous steps.  Now it is time to mount the solar panel. First choose a suitable location on the roof top, or on the ground, where there is no obstruction of sunlight.  The tilt of the stand is nearly equal to the latitude angle of our location.  Tilting : To get the most from solar panels, we need to point them in the direction that captures the maximum sun light, i.e. south if we are in the northern hemisphere or north if we are in the southern hemisphere.
  16. 16.  We are interested to know how much energy is produced by our solar panel or how much energy being consumed by our appliances we have to use energy meters.  the meter combines accurate 1-phase and 3-phase energy and power measurements with data logging, power quality analysis, alarming and I/O capabilities are typically available in such a compact meter.  It provides a high degree of visibility to data and assets that allows for cost savings, rapid response time, and better decisions.  Improve operations and profitability of our facility with this easy-to-install, easy-to-operate meter. Reference: http://clarkpowerproducts.com/products/metering Metering and Data logging
  17. 17. Pros Cons No electricity bills We will need a room to store large solar batteries and a battery bank No electric rate hikes You must closely monitor energy usage so you don’t run out of power. We will have access to power when grid-reliant customers face power outages, grid outages and rolling blackouts. The high costs of setup and maintenance. We will reduce our carbon footprint and decrease our dependence on energy through more efficient use of power. We don’t have access to power if weather, natural disasters or accidents damage or destroy solar panels or solar system. Pros and cons of off-grid solar system
  18. 18. Solar Power Now a Reality at Jaipur Railway Station  Jaipur railway station's rooftop installed solar panels produced 260 units of electricity on the maiden day on Friday (20/05/2016), which was 35 units more than its daily capacity.  The operation was inaugurated by the general manager of North Western Railways (NWR), Anil Singhal, who said, "The energy harnessed from the solar panels will help Jaipur railway station save Rs 7.2 lakh on power bills, annually.  projection is to produce 50 kW power in a year. http://timesofindia.indiatimes.com/city/jaipur/Solar-power-now-a-reality-at-Jaipur-railway-station
  19. 19. Conclusions  Solar energy is a resource that is not only sustainable for energy consumption, it is indefinitely renewable.  Solar panels also require little maintenance; after installation and optimization they are very reliable due to the fact that they actively create electricity in just a few millimeters.  Off-grid Solar systems are also a silent producer of energy.  Off-grid Solar system energy output is maximized when the panel is directly facing the sun. This means that panels in a fixed location, such as the building above, will see a reduced energy production when the sun is not at an optimal angle.  The primary disadvantage of off-grid solar power is that it obviously cannot be created during the night.  The power generated is also reduced during times of cloud cover
  20. 20. Thanks for your attention Any Questions????

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