Jani Junejo Public School

Design of Solar System

Sr. #ProductUnitsWattageTotal WattsDaily Usage ( Hrs)Total Watts -hrs
1DC fan 103636062160
2Energy Saver Lights 10121206720
Load = 2880WH
Current required for AplincesTotal watts/System voltage 40A
Average daily sunny hours in project area12hrs
Required Backup time2hrs
System Voltage 12V
Design of Battery
Backuptime (Hr)xLoad(watts)/System voltage 80Ah
add Eff. @ 90 %88.8888888889Ah
add 80 % DoD111.111111111Ah
Des Amp. HrsSay 111Ah
Proposed Battery Size 110Ah
No of Batteries 1.00909090909No
Say 1No
Design of Solar Panels
Current required for Applinces = total watts/system voltage40A
Current required for Battery = 60% DoD/average daily sunny hrs9.25925925926A
Total current required 49.2592592593A
Lets Take currents for applinces
Power for Solar Panel required = total current required x system voltage480W
add 20 % losses ( lossess + conductor effeiciency) 576W
Proposed Size of panel 250No
No of Panels2.304No
Say 2No
Design of Charge Controller48A
Proposed Size of Charge controler 60A
No of Charge Controlers0.8No
say 1No
for safety of battery proposed 3 charge controlers of 12v/60 A.