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PV SYSTEM DESIGN


PV SYSTEM DESIGN

(Grid Connected System)


Maximum efficiency of PV system is 18.62%


Sizing Example-Load


Item
Quantity
Power per item (W)
Total power (W)
Time of use (h)
Total energy (Wh)
LED
5
20
100
4
400
TV
1
120
120
4
480
Computer
2
130
260
8
2080
Total


480 W

2960 Wh

Equivalent Sun Hours = 5 h/day


Solar Panel Specifications



Power output (Wp) = 240
Vmpp (V)           =     48                         
Impp (A)            =      5
Voc (V)             =     60                                                               
Isc (A)              =      6


Sizing PV Panel













Inverter Sizing


     Minimum nominal power rating = Total power from the panels × Safety margin

Minimum nominal power rating = 710.4 W × 1.2 = 852.48 W

Sizing Charge Controller


Parallel:


Maximum Current = short circuit current × number of panels
Maximum Current = 6A × 3 = 18A

Series:

Maximum Voltage = open circuit voltage × number of panels
Maximum Voltage = 60V × 3 = 180V

Charge Controller Specifications:

Maximum Current (A) = 15
Maximum Voltage (V) = 210
Operational Voltage = 12V/24V

mppt = Yes           (mppt = maximum power point tracker)

  • ·         Panel must be in series as the 15 A controller can’t handle 18A parallel PV setup


Note: For off-grid system additional components will be  as follows


Battery Sizing

Battery Specifications:

Depth of Discharge (DOD) = 60% = 0.6
Battery Voltage                   = 12V
Battery Capacity (Ah)         =100




Number of Batteries Required for the System = 5 × 2 = 10

Invertor Specifications:

Efficiency = 96% = 0.96
Operational Voltage = 12V/24V

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