Alternator Output Curves

Alternator Output Curves

Alternator output is dependent on a number of factors: battery condition and capacity, wire size, engine horsepower and engine RPM, battery temperature and alternator temperature. Of these factors, alternator speed and temperature are the most important.

The following chart describes alternator output based on two temperature levels (ambient (26^oC) and hot (60^oC)). Test voltages are set at 13.5V (for 12V units). Engine-to-alternator drive ratios vary by engine, but a conversion factor of 2 is shown here for simplicity.

Engine RPM		500	750	1000	1250	1500	1750	2000	2250	2500	2750	3000
Typical Drive Ratio		2	2	2	2	2	2	2	2	2	2	2
Alternator RPM		1000	1500	2000	2500	3000	3500	4000	4500	5000	5500	6000
Alternator Model	Temp	Alternator Power Curves by Balmar Model
6- Series, 12V 70 Amp Models	Cold	0	20	68	73	77	78	77	77	76	77	77
6- Series, 12V 70 Amp Models	Hot	0	15	56	63	65	66	65	65	66	66	65
6- Series, 12V 100 Amp Models	Cold	0	21	83	100	106	110	104	106	108	109	108
6- Series, 12V 100 Amp Models	Hot	0	20	70	80	93	93	93	93	94	93	93
6- Series, 12V 120 Amp Models	Cold	0	21	80	116	121	122	125	125	124	124	125
6- Series, 12V 120 Amp Models	Hot	0	20	60	98	105	108	109	110	110	108	109
6- Series, 24V 70 Amp Models	Cold	0	6	36	55	68	71	73	76	76	75	76
6- Series, 24V 70 Amp Models	Hot	0	3	25	40	50	53	53	56	54	56	55
XT- Series, 12V 170 Amp Models	Cold	0	90	128	159	174	182	189	194	196	197	198
XT- Series, 12V 170 Amp Models	Hot	0	90	118	134	144	154	157	159	162	164	166
XT- Series, 12V 250 Amp Models	Cold	0	130	203	239	256	271	278	283	288	289	290
XT- Series, 12V 250 Amp Models	Hot	0	101	142	174	190	199	205	212	216	219	221
XT- Series, 24V 90 Amp Models	Cold	0	41	66	84	94	102	105	107	110	111	112
XT- Series, 24V 90 Amp Models	Hot	0	18	46	60	70	74	77	80	82	84	85
94/94LY- Series, 12V 210 Amp Models	Cold	0	21	78	103	128	147	162	178	191	208	210
94/94LY- Series, 12V 210 Amp Models	Hot	0	15	68	82	103	120	131	142	161	170	175
94/94LY- Series, 24V 140 Amp Models	Cold	0	8	15	38	50	70	77	96	124	131	135
94/94LY- Series, 24V 140 Amp Models	Hot	0	0	10	30	40	58	65	75	92	105	110
95- Series, 12V 210 Amp Model	Cold	0	40	45	100	125	143	155	170	183	190	195
95- Series, 12V 210 Amp Model	Hot	0	35	40	80	115	120	135	142	150	158	161
95- Series, 24V 140 Amp Model	Cold	0	7	14	38	55	65	85	100	113	120	133
95- Series, 24V 140 Amp Model	Hot	0	5	12	35	50	60	78	95	100	105	110
96- Series, 48V 60 Amp Model	Cold	0	18	43	50	56	59	62	62	62	64	64
96- Series, 48V 60 Amp Model	Hot	0	8	23	47	52	54	56	57	58	58	57
96- Series, 48V 100 Amp Model	Cold	0	0	0	23	61	81	93	98	99	107	112
96- Series, 48V 100 Amp Model	Hot	0	0	0	22	57	74	84	90	93	97	100
97XD- Series, 12V 240 Amp Model	Cold	0	92	186	227	254	269	276	280	284	287	289
97XD- Series, 12V 240 Amp Model	Hot	0	52	150	181	201	216	223	229	234	238	240
97XD- Series, 24V 120 Amp Model	Cold	0	35	87	113	128	137	141	144	146	146	147
97XD- Series, 24V 120 Amp Model	Hot	0	20	70	90	101	110	114	118	120	121	122
97XD- Series, 24V 190 Amp Model	Cold	0	28	96	142	168	181	187	192	196	199	201
97XD- Series, 24V 190 Amp Model	Hot	0	20	86	126	152	165	172	177	181	184	186
97EHD- Series, 24V 190 Amp Model	Cold	0	40	100	148	168	180	188	193	198	199	198
97EHD- Series, 24V 190 Amp Model	Hot	0	22	92	125	145	157	166	170	171	178	178
98- Series, 24V 220 Amp Model	Cold	0	26	96	175	216	239	259	276	288	295	303
98- Series, 24V 220 Amp Model	Hot	0	14	54	125	152	170	183	194	203	211	217

Alternator Output Curves

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