SDF: Shah Mardan Public School

Design of Solar System

Sr. #	Product	Units	Wattage	Total Watts	Daily Usage ( Hrs)	Total Watts -hrs
1	DC fan	12	36	432	6	2592
2	Energy Saver Lights	12	12	144	6	864
				576		3456

	Load =				3456	WH
	Current required for Aplinces	Total watts/System voltage			48	A
	Average daily sunny hours in project area				12	hrs
	Required Backup time				2	hrs
	System Voltage				12	V
	Design of Battery
	Backuptime (Hr)xLoad(watts)/System voltage				96	Ah
	add Eff. @ 90 %				106.666666667	Ah
	add 80 % DoD				133.333333333	Ah
	Des Amp. Hrs			Say	133	Ah
	Proposed Battery Size				155	Ah
	No of Batteries				0.858064516129	No
				Say	1	No
	Design of Solar Panels
	Current required for Applinces = total watts/system voltage				48	A
	Current required for Battery = 60% DoD/average daily sunny hrs				11.1111111111	A
	Total current required				59.1111111111	A
	Lets Take currents for applinces
	Power for Solar Panel required = total current required x system voltage				576	W
	add 20 % losses ( lossess + conductor effeiciency)				691.2	W
	Proposed Size of panel				250	No
	No of Panels				2.7648	No
				Say	3	No
	Design of Charge Controller				57.6	A
	Proposed Size of Charge controler				60	A
	No of Charge Controlers				0.96	No
				say	1	No
	for safety of battery proposed 01 charge controlers of 12v/60A.