10
Battery Voltage vs Capacity
•
Voltage of a battery can be an indication of its “state-of-charge”.
•
The voltage-capacity relationship is most accurate when the
fridge is not running and the battery temperature is at 25°C.
•
By measuring the voltage, we can estimate the amount of
energy remaining in the battery.
•
Changes in temperature, battery age and general battery health
can influence this relationship and therefore result in inaccurate
capacity measurement.
•
Normal battery operation takes place between 12.0 and 12.6 volts.
•
Depending on the manufacturer’s specifications a normal car’s
alternator charges between 13.7 and 14.2 volts.
•
A battery should not be discharged below 11.8 volts as a general
rule. A “deep-discharged” battery should be recharged as soon as
possible to prevent permanent damage.
Danfoss Low Voltage Battery Protection
The Danfoss electronic control unit will cut-out at the low / medium / high selected setting.
Once the compressor has cut-out, it will not restart (cut-in) until the voltage rises.
The table below reflects the set points.
BATTERY
CAPACITY
BATTERY
VOLTAGE
When using the unit in a 24-volt application
do not select
battery protection
“LOW”
as this will completely drain the battery bank.
(Causing permanent damage to the batteries)
12 VOLT
24 VOLT
Battery
Protection
Cut-out
Cut-in
C
ut-out
Cut-in
LOW
9.6
10.9
MED
10.4
11.7
22.8
24.2
HIGH
11.3
12.5
24.6
26.0
Note: these values are measured at the
Danfoss control unit input. It is important
to note that poor / thin wiring and bad con-
nections to the battery can cause a large
voltage drop. When this occurs the fridge
switches off and will re-start again on a
repeat cycle “hunting”.
NOTE:
When connecting the fridge for the first time, it will look at the cut-in voltage.
If the battery protection is set on “High” the initial cut in voltage will be 12.5.
If the battery is not fully charged the fridge will not start. Simply select low to start.
When selecting “Low” the fridge will operate within a voltage supply of 9.6-31.5volts.
Summary of Contents for Classic 40 litre
Page 1: ...PORTABLE REFRIGERATOR...
