ENGINE ALTERNATOR SET CAPACITY CALCULATION

LOAD    ANALYSIS
Sr.No.	Load Details	Load Type (Non-linear /Motor/   Lighting)	Rated KVA	Quantity	Connected Load      KVA	Utilisation Factor	Peak Load     KVA	Starting Current	Starting KVA
Three Phase Load
1	NIL
Single Phase Load
1	Equipment Load          ( 6X25 A ,50V DC with eff.  0.85 & pf  0.85 )	Non-linear	10.38	1.00	10.38	60%	6.23	85%	8.82
2	Windo Air conditioner                  ( 10A,230 V AC)	Motor	2.3	2	4.6	0.5	2.3	50	11.5
3	Tube Fittings                 (2x40 W)	Lighting	0.1	2	0.2	1	0.2
	Total				15.18		8.73
	Total Single Phase Load	8.73	KVA	Genset  rating	10	KVA
	Assuming above single phase load  equally distributed	2.91	KVA
	Assuming that the largest load is started at last
	Base Load on generator		8.73 - 2.3		.=	6.43	KVA
	KVA required  while starting last load			.=	6.43+11.5	.=	17.93	KVA*
	For Gen set of 10 KVA short time capacity is 20 KVA.( 2 times the Rated capacity)
	* this value is within short time capacity ,hence the Gen set rating is  10 KVA.							I
	Total KVA required at site		8.73	KVA
	Reserve for future	15%	1.31
			10.04	KVA
	Derating for Altitude 500 m,Temp 40 0 C  & Humidity 90% RH	0.92
	Gen set Rating		10.91	KVA
	Standard available Gen set		15	KVA	Three phase alternator -As single load 6.43 KVA is more than that can put on one phase i.e.5 KVA.			II
	Recommended Gen set capacity		15	KVA	single phase