Shah Mardan Public School

Design of Solar System

Sr. #ProductUnitsWattageTotal WattsDaily Usage ( Hrs)Total Watts -hrs
1DC fan 123643262592
2Energy Saver Lights 12121446864
Load = 3456WH
Current required for AplincesTotal watts/System voltage 48A
Average daily sunny hours in project area12hrs
Required Backup time2hrs
System Voltage 12V
Design of Battery
Backuptime (Hr)xLoad(watts)/System voltage 96Ah
add Eff. @ 90 %106.666666667Ah
add 80 % DoD133.333333333Ah
Des Amp. HrsSay 133Ah
Proposed Battery Size 155Ah
No of Batteries 0.858064516129No
Say 1No
Design of Solar Panels
Current required for Applinces = total watts/system voltage48A
Current required for Battery = 60% DoD/average daily sunny hrs11.1111111111A
Total current required 59.1111111111A
Lets Take currents for applinces
Power for Solar Panel required = total current required x system voltage576W
add 20 % losses ( lossess + conductor effeiciency) 691.2W
Proposed Size of panel 250No
No of Panels2.7648No
Say 3No
Design of Charge Controller57.6A
Proposed Size of Charge controler 60A
No of Charge Controlers0.96No
say 1No
for safety of battery proposed 01 charge controlers of 12v/60A.