69235374 PV Off Grid Design

8/12/2019 69235374 PV Off Grid Design

1/17

Designing a PV System


2/17

Input Data Required For PV SystemInput Data Required For PV System

SizingSizing

The daily or hourly load requirements during aThe daily or hourly load requirements during atypical yeartypical year

The required security of supply, taing intoThe required security of supply, taing intoaccount the !ac"up source, if any#account the !ac"up source, if any#

The mean daily irradiation in the plane of theThe mean daily irradiation in the plane of thearray at the chosen site for e$ery month of aarray at the chosen site for e$ery month of atypical year#typical year#


3/17

Data Required cont%dData Required cont%d

The ma&imum num!er of consecuti$e sunless days lielyThe ma&imum num!er of consecuti$e sunless days lielyto !e e&perienced#to !e e&perienced#

The mean daily am!ient temperature for e$ery month ofThe mean daily am!ient temperature for e$ery month ofa typical year#a typical year#

The estimated cell temperature rise a!o$e am!ient of theThe estimated cell temperature rise a!o$e am!ient of the

modules in the array#modules in the array#

Typical current"$oltage characteristics of the module atTypical current"$oltage characteristics of the module at$arious irradiances#$arious irradiances#


4/17

Data Required cont%dData Required cont%d

The selected D' !us $oltage#The selected D' !us $oltage# The ma&imum allo(a!le depth of discharge ofThe ma&imum allo(a!le depth of discharge of

the !attery#the !attery#

The estimated percentage energy losses in theThe estimated percentage energy losses in the!attery, po(er conditioning equipment and!attery, po(er conditioning equipment andcontrol system#control system#

The estimated losses in the array from moduleThe estimated losses in the array from module

mismatch, ca!les and $oltage drop acrossmismatch, ca!les and $oltage drop across!locing diodes#!locing diodes# The estimated losses from dust and shading#The estimated losses from dust and shading#


5/17

Ty e s o f )a te r i a ls

Single CrystalPolycrystalline

Thin-Film


6/17

*ff"+rid Design


7/17

*ff"+rid Design &ample

Step -. Determine the D' /oad#

D' De$ice De$ice 0 1ours of 2 D' 3att"1rs 3atts Daily 4se per Day

Refrigerator 56 78 -,886

/ighting fi&tures -96 8 566

De$ice : -7 ;


8/17

Step 7. Determine the :' /oad, 'on$ert to D'

:' De$ice De$ice 0 1ours of 2 :' 3att"1rs 3atts Daily 4se per Day

De$ice A -B9 5 -,696

Pump ;6 6#9 86

Tele$ision -B9 7 @96

Total :' 3att"hrs=Day -,886Di$ided !y 6#;9 CIn$erter, losses

Total D' 3hrs=Day >A? -,5


9/17

Step @. Determine the Total System /oadTotal D' /oads >:? 7,-@5Total D' /oads >A? -,5


10/17

Step 5. Determine Total PV :rray 'urrent

Total Daily :mp"hr requirement = Design Insolation@;@ :mp"hrs = 9#6 pea solar hrs 2 B5#5 :mps

Insolation Aased on *ptimum Tilt for Season

Step B. Select PV )odule Type

'hoose AP Solar"Solare& )S0"56 module.)a& Po(er 2 56 3 CSTP

)a& 'urrent 2 @#95 :mps)a& Voltage 2 -5#; VoltsEominal *utput Voltage -7 Volts


11/17

Total PV :rray 'urrent = C)odule *perating 'urrent 0C)odule Derate FactorB5#5 :mps = C@#95 :mps=)oduleC6#


12/17

Step --. Determine )inimum Aattery 'apacity

>Total Daily :mp"hr=Day (ith Aatteries CStep 90 Desired Reser$e Time CDays? = Percent of4sa!le Aattery 'apacityC@;@ :mp"hrs=Day 0 @ Days = 6#;6 2 -,8@5 :mp"hrs

Step -7. 'hoose a Aattery

4se an Interstate 47S G -66 Flooded /ead :cid AatteryEominal Voltage 2 5 VoltsRated 'apacity 2 776 :mp"hrs


13/17

Step -@. Determine Eum!er of Aatteries in Parallel

Required Aattery 'apacity CStep -- = 'apacity of

Selected Aattery-,8@5 :mp"hrs = C776 :mp"hrs=Aattery 2 5#9 4se 5 Aatteries

Step -8. Determine Eum!er of Aatteries in Series

Eominal System Voltage = Eominal Aattery Voltage-7 Volts = C5 Volts=Aattery 2 7 Aatteries

Step -9. Determine Total Eum!er of AatteriesEum!er of Aatteries in Parallel 0 Eum!er of Aatteries in Series5 0 7 2 -7 Aatteries


14/17

H

"

H

" "H

@ :-7 V

@ :-7 V @ :

78 V

@ :-7 V

@ :-7 V

H H

" "

H

"5 :-7 V

Series.Voltage is additi$e

Parallel.'urrent is additi$e


15/17

Step -B. 'omplete Aalance of System

a# 'omplete the design !y specifying the.'harge 'ontrollerIn$erter3ire Sizes CAattery (ill ha$e larger gage

due to higher currentsFuses and DisconnectsStand!y +enerator, if neededAattery 'harger, if needed)anual Transfer S(itch, if needed#

Step -5. Determine the need for a Stand!y+enerator to reduce other 'omponents

Cnum!er of )odules and Aatteries# Se$eraliterations may !e necessary to optimize costs#


16/17

d# *!tain permits as required#

!# Determine mounting method.

Roof mount+round mount (ith racs+round mount (ith pole#

c# :ssure proper grounding for safety#

Step -BC'ont#.


17/17

The legance of Simplicity

Documents

69235374 PV Off Grid Design