Agm Batteries; Battery Discharge Protection; Main Electrical Shut-Off Switch - PREVOST H3-41 Maintenance Manual

9.3

AGM BATTERIES

This vehicle is equipped with PRIME energy
management system, it is provided with four (4)
Absorbed Glass Mat (AGM) 12-volt batteries
connected in series-parallel.
These batteries require no maintenance for their
lifetime. They can withstand deeper discharge
cycles and several times the charging cycles of
a standard battery.
These are sealed, valve regulated recombinant
batteries which means that the oxygen created
will recombine with the hydrogen in the battery,
creating water and preventing water loss. Water
never needs to be added to this type of battery.
The top-mounted negative
terminals are tightly sealed to prevent leaks.
The electrolyte in this type of battery is absorbed
in micro-porous glass separators. This design
prevents spills and results in greater resistance
to vibration.
Always replace these batteries with identical
make and model batteries as the system is
balanced and optimized for this type of battery.
CAUTION
Replace only with AGM type batteries of the
same specification and capacity.
PRIME system is programmed for the charging
capacity of the batteries installed.
Installing a higher capacity battery will affect
the battery life as the system will not fully
charge the batteries, which is detrimental to
battery performance.
Refer to "Specifications" at the end of this
section for further details.
AGM batteries should be replaced in pairs or
four at a time.
CAUTION
AGM (Absorbed Glass Mat) batteries require a
voltage-limited charger, ideally fitted with a
battery temperature sensor for temperature
correction of charging parameters.
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 one
time – may greatly shorten its life.
9.4
To prevent discharge of the batteries when the
engine in not running, some functions are
automatically switched off if the batteries voltage
drops below 24.4 volts for more than 30
seconds.
pictogram will show on the DID. Set the ignition
key to the OFF position and then turn the
ignition key to the ON position to reactivate the
functions for a period of 30 seconds before they
switch off again.
If a prolonged use of the functions with the
engine not running is necessary, connect the
battery to a charger.
and positive
9.5
Main 12-volt and 24-volt battery (master) relays
are provided for this vehicle. The relays are
located in the main power compartment. The 24-
volt battery relay R1 & 12-volt battery relay R3
engage when ignition key is in the ON or ACC
position and the main electrical shut-off switch
is set to the ON position.
When the main electrical shut-off switch is set to
the OFF position, the main battery relays R1 &
R3 disengage thus all electrical supply from the
batteries to main circuit breakers CB1, CB3,
CB5, CB8, CB10, CB11, CB13, is cut off, with
the exception of the following items, among
others.
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PA1621 Maintenance Manual All Series | Revised Sept 2019
SECTION 06: ELECTRICAL

BATTERY DISCHARGE PROTECTION

The "Battery

MAIN ELECTRICAL SHUT-OFF SWITCH

Main circuit breakers CB2, CB6, CB9 which
are directly connected to the batteries;
Battery equalizer check module;
MCM;
ECM;
TCM (Allison transmission);
Aftertreatment Control Module (ACM);
Preheater electronic timer;
Preheater and water recirculating pump;
Entrance door;
Radio memory;
Fire suppression system (momentarily);
Horn, Hazard:
Wheelchair lift system;
Cluster memory.
Voltage Warning"
61