DOWN UNDER SERIES
17
From a service and warranty point of view, the circuit breakers can fail, so make sure this
component is tested.
Handy Hint: Where there is a drop in voltage there is HEAT so feel the components and
visually check for signs of heat; burning, black terminal covers, tainted metal on connectors
etc.
Important: These tests must be done under load (with compressor running), there will be no
voltage drop if the system is not under load.
Note: The cutout voltage is measured at the Secop control module. As a rule of thumb there
will be approximately 0.5 to 0.8 Volt of losses through the wiring and connectors and circuit
breaker inside the unit, this does not include the losses in the customers wiring set-up.
Example: The unit is set on high battery protection, which is 11.1 V cutout at the
compressor, with losses in the fridge (wiring, connections, circuit breaker) of 0.8 Volts,
this is now showing the fridge cutting out at 11.9 Volts at the battery. Now if we include
the lead we supply, the connection in the customers car and the 5 to 6 metres of cable
from the secondary battery to the fridge this could equate to another 1 to 2 Volts of losses
between the battery and the compressor module, NOW we would measure around 12.9 or
13.9 at the battery and the fridge is cutting out.
These figures are conservative standard resting 12 V battery charge:
• 12.8 volts = 100%
• 12.5 volts = 70%
• 12.3 volts = 50%
• 11.4 volts = 20%
At the Battery: 12.8 Volts minus 1.5 Volts for customers wiring and connections.
At the Anderson connector on the fridge: 11.3 Volts minus 0.8 Volts of losses inside the
cabinet.
At the Secop module on compressor: 10.5 Volts
You can see in this example that the fridge will not start at all in High or Medium battery
monitor mode.
Battery Monitor Mode L M H
Switch-o voltage at 12V 10.1V 10.5V 11.1V
Restart voltage at 12V 10.9V 11.4V 12.4V
Switch-o voltage at 24V 21.5V 22.3V 24.3V
Restart voltage at 24V 22.7V 23.7V 25.7V
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