10Battery Voltage vs Capacity• Voltage of a battery can be an indication of its “state-of-charge”.• The voltage-capacity relationship is most accurate when thefridge is not running and the battery temperature is at 25°C.• By measuring the voltage, we can estimate the amount ofenergy remaining in the battery.• Changes in temperature, battery age and general battery healthcan influence this relationship and therefore result in inaccuratecapacity measurement.• Normal battery operation takes place between 12.0 and 12.6 volts.• Depending on the manufacturer’s specifications a normal car’salternator charges between 13.7 and 14.2 volts.• A battery should not be discharged below 11.8 volts as a generalrule. A “deep-discharged” battery should be recharged as soon aspossible to prevent permanent damage.Danfoss Low Voltage Battery ProtectionThe 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.BATTERYCAPACITYBATTERYVOLTAGEWhen using the unit in a 24-volt applicationdo not select battery protection “LOW”as this will completely drain the battery bank.(Causing permanent damage to the batteries)12 VOLT 24 VOLTBatteryProtection Cut-out Cut-in Cut-out Cut-inLOW 9.6 10.9MED 10.4 11.7 22.8 24.2HIGH 11.3 12.5 24.6 26.0Note: these values are measured at theDanfoss control unit input. It is importantto note that poor / thin wiring and bad con-nections to the battery can cause a largevoltage drop. When this occurs the fridgeswitches off and will re-start again on arepeat 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.