SDF: Jani Junejo Public School

Design of Solar System

Sr. #	Product	Units	Wattage	Total Watts	Daily Usage ( Hrs)	Total Watts -hrs
1	DC fan	10	36	360	6	2160
2	Energy Saver Lights	10	12	120	6	720
				480		2880

	Load =				2880	WH
	Current required for Aplinces	Total watts/System voltage			40	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				80	Ah
	add Eff. @ 90 %				88.8888888889	Ah
	add 80 % DoD				111.111111111	Ah
	Des Amp. Hrs			Say	111	Ah
	Proposed Battery Size				110	Ah
	No of Batteries				1.00909090909	No
				Say	1	No
	Design of Solar Panels
	Current required for Applinces = total watts/system voltage				40	A
	Current required for Battery = 60% DoD/average daily sunny hrs				9.25925925926	A
	Total current required				49.2592592593	A
	Lets Take currents for applinces
	Power for Solar Panel required = total current required x system voltage				480	W
	add 20 % losses ( lossess + conductor effeiciency)				576	W
	Proposed Size of panel				250	No
	No of Panels				2.304	No
				Say	2	No
	Design of Charge Controller				48	A
	Proposed Size of Charge controler				60	A
	No of Charge Controlers				0.8	No
				say	1	No
	for safety of battery proposed 3 charge controlers of 12v/60 A.