weekly presentation _system sizing_reading an electrical wiring

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

weekly presentation _system sizing_reading an electrical wiring

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