PREVOST X3-45 COMMUTER User Manual

SECTION 06: ELECTRICAL
60
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 06 revised release October 2021
vehicle cables are detached. The alligator
clamps should make firm contact with the lead
pads (Figure 46).
FIGURE 46 ALLIGATOR CLAMP POSITION– TYPICAL
AGM BATTERY
WARNING
Always turn off the charger before connecting
or disconnecting to a battery.
NOTE
The charge rate must be doubled when the
bat
teries are charged by the booster block,
because of the series-parallel circuit.
AGM (Absorbed Glass Mat) batteries require
a voltage-limited charger, ideally fitted with a
battery temperature sensor for temperature
correction of charging parameters.
Do not manually charge AGM batteries. Look
for the following voltage values on your
voltage-limited charger.
Charge voltage: 13.8-14.6 Volt @77°F (25°C)
Float voltage: 13.4-13.6 Volt @77°F (25°C)
Charging AGM battery on a typical constant
current or taper current charger – even once –
may greatly shorten its life.
• The maximum charge rate in amperes
should be no more than 1/3 of the battery’s
reserve capacity minute rating.
• State-of-charge is estimated from the OCV
(open-circuit voltage). Typical values are
shown on the charging time table below.
CHARGING TIME TABLE FOR A SINGLE BATTERY
OCV
(AGM)
STATE OF
CHARGE
CHARGER MAXIMUM RATE
30 A 20 A 10 A
12.8V
100%
Ready to use
12.6V
75%
0.9
1.3
2.5
12.2V
50%
1.9
2.7
5.1
12.0V
25%
2.9
4.3
7.8
11.8V
0%
4.0
5.7
10.7
CAUTION
AGM Battery Charging Considerations
Many common battery chargers are not fully
compatible with AGM batteries, however; they
will not ruin the bat
tery if used a few times
over the battery’s life.
Adversely, not all chargers are really AGM
compatible and can do significant damage to
an AGM battery. Large “wheeled chargers”
found in many shops, which exceed 15.4 volts
must be avoided.
If an AGM batt
ery needs to be charged
outs
ide of the vehicle’s charging system,
charging voltage should be 13.8 –
14.8 @
77°F (25°C). Not to exceed 30 Amps.
The time required for a charge will vary
according to the following factors:
Temperature
A longer time will be needed to charge any
battery at 0
o
F (-18
o
C) than at 80
o
F (27
o
C). When
a fast charger is connected to a cold battery, the
current accepted by the battery will be very low
at first, and then in time, the battery will accept a
higher rate as it warms.
State of Charge
For example, a completely discharged battery
requires more than twice as much charge than a
half-charged battery. Since the electrolyte is
nearly pure water and a poor conductor in a
completely discharged battery, the current
accepted is very low at first. Later, as the
charging current causes the electrolyte acid
content to increase, the charging current will
likewise increase.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in