# Calculate Size of Solar Panel and Inverter

Calculate Size of Solar Panel, No of Solar Panel and Size of Inverter for following Electrical Load
• 1 No’s of 100W Computer use for 8 Hours/Day
• 2 No’s of 60W Fan use for 8 Hours/Day
• 1 No’s of 100W CFL Light use for 8 Hours/Day
Solar System Detail:
• Solar System Voltage (As per Battery Bank) = 48V DC
• Loose Wiring Connection Factor = 20%
• Daily Sunshine Hour in Summer = 6 Hours/Day
• Daily Sunshine Hour in Winter = 4.5 Hours/Day
• Daily Sunshine Hour in Monsoon = 4 Hours/Day
Inverter Detail:
• Future Load Expansion Factor = 10%
• Inverter Efficiency = 80%
• Inverter Power Factor =0.8

### Calculation:

Step-1: Calculate Electrical Usages per Day
• Power Consumption for Computer = No x Watt x Use Hours/Day
• Power Consumption for Computer = 1x100x8 =800 Watt Hr/Day
• Power Consumption for Fan = No x Watt x Use Hours/Day
• Power Consumption for Fan = 2x60x8 = 960 Watt Hr/Day
• Power Consumption for CFL Light = No x Watt x Use Hours/Day
• Power Consumption for CFL Light = 1x100x8 = 800 Watt Hr/Day
• Total Electrical Load = 800+960+800 =2560 Watt Hr/Day
Step-2: Calculate Solar Panel Size
• Average Sunshine Hours = Daily Sunshine Hour in Summer+ Winter+ Monsoon /3
• Average Sunshine Hours = 6+4.5+4 / 3 =8 Hours
• Total Electrical Load =2560 Watt Hr/Day
• Required Size of Solar Panel = (Electrical Load / Avg. Sunshine) X Correction Factor
• Required Size of Solar Panel =(2560 / 4.8) x 1.2 = 635.6 Watt
• Required Size of Solar Panel = 635.6 Watt
Step-3: Calculate No of Solar Panel / Array of Solar Panel
If we Use 250 Watt, 24V Solar Panel in Series-Parallel Type Connection
• In Series-Parallel Connection Both Capacity (watt) and Volt are increases
• No of String of Solar Panel (Watt) = Size of Solar Panel / Capacity of Each Panel
• No of String of Solar Panel ( Watt) = 635.6 / 250 = 2.5 No’s Say 3 No’s
• No of Solar Panel in Each String= Solar System Volt / Each Solar Panel Volt
• No of Solar Panel in Each String= 48/24 =2 No’s
• Total No of Solar Panel = No of String of Solar Panel x No of Solar Panel in Each String
• Total No of Solar Panel = 3×2 =6 No’s
• Total No of Solar Panel =6 No’s
• Load for Computer = No x Watt
• Load for Computer = 1×100 =100 Watt
• Load for Fan = No x Watt
• Load for Fan = 2×60 = 120 Watt
• Load for CFL Light = No x Watt
• Load for CFL Light = 1×100 = 100 Watt
• Total Electrical Load = 100+120+100 =320 Watt
Step-5: Calculate Size of :
• Total Electrical Load in Watt = 320 Watt
• Total Electrical Load in VA= Watt /P.F
• Total Electrical Load in VA =320/0.8 = 400VA
• Size of Inverter =Total Load x Correction Factor / Efficiency
• Size of Inverter = 320 x 1.2 / 80% =440 Watt
• Size of Inverter =400 x 1.2 / 80% =600 VA
• Size of Inverter = 440 Watt or 600 VA

### Summary:

• Required Size of Solar Panel = 635.6 Watt
• Size of Each Solar Panel = 250 Watt. 12 V
• No of String of Solar Panel = 3 No’s
• No of Solar Panel in Each String = 2 No’s
• Total No of Solar Panel =6 No’s
• Total Size of Solar Panel = 750 Watt
• Size of Inverter = 440 watt or 600 VA

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