Voltage Drop &
WIRING REQUIREMENTS
Page 11
SIMPLE TESTS
• Fridgedoesnotoperateinyourvehicle:
Run the fridge from a 240 volt power source via an AC adaptor. If the
fridge starts and runs then the problem is with your vehicle, either the
battery or the wiring.
See section on voltage drop (AC adaptor, minimum of 10 amps at 12
volts peak or 5 amps at 24 volts peak).
NOTE: The EvaKool AC adaptor model EP24 delivers 24 volts.
• Fridgedoesnotoperatefroma240voltpowersourcewhenusing
an AC adaptor:
Run the fridge from your vehicle or other fully charged 12 volt battery
source. If the fridge starts and runs, then the problem is with the AC
adaptor or fridge lead.
• NOTE: It is important to ensure in all cases that the voltage at the end of
lead connecting to the fridge is adequate. ie: above 11.0 volts.
VOLTAGE DROP
The majority of our customer inquiries are related to voltage drop, which means the power to
run the fridge is lost between the power supply (the battery) and the fridge compressor.
The Danfoss compressor requires over 10.4 volts (12 volt) and 22.8 volts (24 volt) to
operate. If the voltage drops to these points or below, the fridge will default, you will hear the
compressor trying to start every minute or so.
WHEN VOLTAGE DROPS OCCUR:
(a) The cigarette lighter socket in your car or 4WD will have on average 3mm wiring. This
wiring is too thin and will drop voltage from one end to the other. Danfoss recommend a
minimum of 6mm auto cable and if the distance from the power source is over 6 metres,
10mm wiring is required. Consult an auto electrician should you need to upgrade.
(b) Check for dirty or loose connections at the battery and outlet.
(c) Are there any relays or after market voltage protection devices in the line to your fridge.
These also have voltage drops through them.
(d) Check that your battery doesn’t drop voltage under load.
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