Calculate Size of Solar Panel, No of Solar Panel and Size of Inverter for following Electrical Load

**Electrical Load Detail:**

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**

**Step-4: Calculate Electrical Load:**

Load for Computer = No x Watt

Load for Computer = 1×100 =1**00 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 Inverter:**

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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