Operation and maintenance manual

QSB4.5 and QSB6.7 Electrical System
Section V - Maintenance Specifications Page V-7
Electrical System
Specifications
Recommended Battery Capacity
System Voltage Ambient Temperature
-18°C [0°F] -29°C [-20°F]
Cold Cranking
Amperes
Reserve Capacity
(minutes)
1
Cold Cranking
Amperes
Reserve Capacity
(minutes)
1
6 cylinder engines
12-VDC 1500 260 1900 260
24-VDC
2
750 130 950 130
4 cylinder engines
12-VDC 1200 260 1500 260
24-VDC
2
600 260 750 260
1
The number of plates within a given battery size determines reserve capacity. Reserve capacity is the length of
time for which a battery at 27°C [81°F] can supply 25 amperes at 10.5-VDC or greater.
2
Cold cranking amp(s)(CCA) ratings are based on two 12-VDC batteries in series.
Batteries (Specific Gravity)
Specific Gravity at 27°C [81°F] State of Charge
1.260 to 1.280 100%
1.230 to 1.250 75%
1.200 to 1.220 50%
1.170 to 1.190 25%
1.110 to 1.130 Discharged