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7/30/2019 Weekly Presentation _System Sizing_reading an Electrical Wiring
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Kunal sharma
System Sizingof Off Grid
System
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2
Block Diagram
PV Module
Inverter/PCU Loads
Grid Supply
Battery
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Steps to Design SPV System
Space Assessment.
Load calculation.
Determine the Inverter capacity(VA).
Determine the Battery capacity(Ah).
Determine the wattage of SPV Module. Web Based off-grid system software.
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Space Assessment
Following are the important factors for space assessment
Solar Insolation.
Space available to mount Modules in South Facing manner.
Shadow from neighbouring objects (Building, trees, etc).
Area available
150 sq feet for 1 kW system - crystalline
195 sq feet for 1 kW system - thin film
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Load Calculation(1/2)
Calculate the wattage of each load, its quantity and running hours
per day.
Multiply quantity * wattage of each load =total wattage.
Multiply total wattage * hours of operation per day=energy. Calculate sum of total energy.
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Load Calculation (2/2)
LOAD CALCULATION
Load Power(watt) NumberPower
(Watt)Hr/day
Energy
(Watt-Hr)
CFL 20 6 120 4 480
FAN 130 4 520 4 2080
TV 160 1 160 3 480
COMPUTER 120 1 120 4 480
Total
power=920
Total
energy=3520
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Determine the inverter capacity(1/1)
Determine the inverter capacity
Power factor 0.85
Inverter
efficiency 90%
Invertercapacity(VA)
Totalpower/(p.f*inv.eff.) 974.1176471
Standard Inverter Capacity
1000VA,24V
Inverter Capacity=Total power
/(P.F X inverter efficiency)
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Determine the Battery
capacity(Ah)(1/2) Divide total Energy(watt-hour) by system voltage (volts)
Battery Capacity=total energy/system voltage (Ah)
Consider depth of discharge and divide battery capacity to the depth
of discharge.
Consider power factor and divide by battery capacity. Consider battery efficiency and divide by battery capacity
Actual capacity=Battery capacity/(DOD Xbatt.eff. X P.F)
Take the nearest available battery capacity.
h
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Determine the Battery
capacity(Ah)(2/2)
Determine the Battery Sizing
Power factor 0.85
Depth of Discharge 70%
Battery efficiency 85%
System Voltage 24
Battery Capacity(Ah)
Total watt hours/System Voltage
146.6666667
Requried Battery
Capacity(Ah)
Battery Capacity(Ah)/PF*DOD*Batt.Eff.
289.9983523
Standard Battery Available
2 NOS 300Ah
12V
h f
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Determine the Wattage of SPV
Module(1/2) Determine the solar insolation (sun hours) of the area.
Divide total required energy by solar insolation.
SPV Wattage= watt-hours/solar insolation.
Consider Power Factor and divide by SPV wattage.
Consider Inverter efficiency and divide by SPV wattage.
Consider SPV module losses and divide wattage by losses.
Take standard capacity of module .
Total SPV module wattageno of module X standard wattage of
module.
i h W f S V
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Determine the Wattage of SPV
Module(2/2)
Determine the SPV Sizing
Solar insolation 5.5 Kwh/m2 /day
Inverter eff. 90%
SPV detating factor 85%
SPV SIZINGTotal watt hours/solar Insolation 640
Required SPV SIZING SPV SIZING/Inv.eff.*SPV D.F 836.6013072
STANDARD SPV MODULE
8 NOS 105Wp
MODULE
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Block Diagram For Designed System
PV Module
Power-
840Wp(8*105Wp)
Inverter/PCU
1000VA,24V
Loads
Power-920W
Energy-3520 Ah
Grid Supply
1-phase,230V,AC
Battery
2 nos 12V, 300 Ah
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Web Based off-grid system software's
The off-grid system are being also designed with the help of web
based off grid softwares . Few softwares are as follows :-
PV SYST
SMA Off grid Configuration
ARKASYS
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Thank-You