Miller Big Blue 300 PRO Series User Manual

 Complete Parts List is available at www.MillerWelds.com
OM-259 355 Page 20
4-8. Duty Cycle And Overheating
1 100% Duty Cycle
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
 This unit is rated for welding at
250 amperes continuously.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
217 515
10 15 20 25 30 40 50 60 80 100
CC
CV
1000
800
600
500
400
300
250
200
150
100
WELD AMPERES
% DUTY CYCLE
1
4-9. AC Generator Power Curve
237 494
0 40 80 120 160
0 20406080
AC AMPERES IN 120 V MODE
AC AMPERES IN 240 V MODE
300
250
200
150
100
50
0
150
125
100
75
50
25
0
AC VOLTS
The AC power curve shows the
generator power in amperes avail-
able at the 120 and 240 volt
receptacles.

Miller Big Blue 300 PRO Series Specifications

General

Engine Power	24.8 hp (18.5 kW)
CC/CV	Yes
Frequency	60 Hz
Protection Class	IP23
Duty Cycle	100%
Generator Output	10, 000 Watts Peak, 9, 000 Watts Continuous
Welding Amperage Range	30-300 A
Output Current Range	30-300 A
Welding Processes	Stick (SMAW), TIG (GTAW), MIG (GMAW), Flux-Cored (FCAW)