Airstream Interstate 24X, Owner'S Manual

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Maintenance
9-6
2022 Interstate 24X
Lithium Iron Phosphate Batteries
(House Batteries)
Your Airstream Touring Coach is factory-equipped with
two 100Ah 12V LiFePO4 deep cycle batteries� The
house batteries are mounted to the underbody and can
be accessed from under the rear of the coach�
Lithium Technology
Lithium batteries are designed to outperform traditional
lead acid batteries and offer more usable energy� The
Lithium batteries have a life span of approximately
3000-5000 cycles� A cycle is determined by a discharge
and a charge� How many cycles a lithium battery can
sustain is determined by how depleted a battery is
discharged, before it is charged� A battery that is only
discharged 50% will have more cycles than a battery
that is constantly discharged to 0%�
Lithium batteries provide longer life and faster
charging than lead acid batteries, while still providing
80% of the rated capacity, after thousands of cycles�
If the batteries are completely depleted, it will take
approximately 8 hours to charge the 200Ah battery
bank, at 25 amps�
Unlike lead acid batteries, which require water
replacement, lithium batteries require no active
maintenance� The use of lithium batteries in Airstream’s
Touring Coach, also provides the benefit of delivering
more energy at typically half the weight of a traditional
battery�
NOTE
An owner’s manual for the lithium batteries
is provided in the Airstream Owner’s Packet.
Make sure to read, understand, and follow
all information, such as Notes, Cautions, and
Warnings, before operating.
Battery Management System (BMS)
A BMS is crucial in ensuring safe operation of any
lithium battery� The BMS monitors cell voltages,
currents, and temperatures to make sure they are
operating in a safe range� The BMS is sealed internally
and will shut the battery down should any fault
condition occur� The battery will restart once the fault
condition is cleared� The following, are features of the
BMS:
• Over/under voltage protection
• High current protection/short circuit
• High temperature protection
• Low temperature charging protection
• Cell balancing
CAUTION
Even though the BMS will protect against issues
from overcharging, it should be avoided. The
recommended specs are 14.4-14.6 bulk/absorb and
below 13.6 float.
The BMS will shut the batteries down when the battery
voltage drops below approximately 11�5 VDC� When
the batteries shut down, due to Low Battery Cut Off
(LBCO), both the main battery disconnect switch and
inverter power switch will remain in the positions they
were in, prior to the batteries shutting down�
To bring the batteries out of LBCO Mode, a voltage of
approximately 11 VDC or greater needs to be applied
across the battery terminals� There are three ways of
doing this:
1� Start and run the vehicle engine� This will provide
alternator voltage of approximately 14�5 VDC
across the battery terminals and provide a charge
current through the DC-DC converter� The DC-DC
converter will limit the charge current to the house
batteries to approximately 40 amps� This should
take approximately 1 minute�
2� Jump the house batteries with an external battery
charger (only one battery will need to be jumped)�
3� Plug the touring coach into external AC power
using the shoreline power cord�
NOTE
When the inverter/charger display turns on, the
vehicles engine can be turned off, if the coach is
plugged in or the generator is started. Otherwise,
the engine will need to be ran long enough to fully
charge the house batteries.