LiFePo4 battery for power supply

Converting to LiFePo4 batteries is associated with many advantages. Nevertheless, there are a few points to consider to ensure that the power supply to your camper and the devices installed in it is also optimised with LiFePo4 batteries.

A comparison of the manufacturer’s specifications for both the battery and the connected devices is the first step in assessing whether the conversion is possible in your vehicle.

The right energy management is a decisive factor for the correct function of the Truma devices.
Here are the most important points:

  • Current output: The sum of the maximum current consumption of the devices operated simultaneously must be taken into account.
    With a Mover XT, for example, approx. 150A; Combi D up to 40A in the start phase; Combi D next generation up to 80 A with current peaks for a few milliseconds (peaks).
    The vehicle-mounted battery must be able to provide this power output, otherwise functional restrictions must be expected.
  • Charger: It must be ensured that the charger/alternator used is suitable for use with LiFePo4 batteries.
    • Charging characteristic max. 14.3 V:
      This corresponds to level “AGM 1” for most chargers, alternatively level “Gel” can be used.
  • Solar power regulator: Due to the upstream electronics (BMS), some LiFePo4 batteries cannot buffer excess voltages, so a buffering option must be created here for solar systems.
  • Battery connection: not only the battery must be able to deliver the power, but also the cabling. Ensure a sufficient cross-section (min. 35 mm²) and correct cable connections. A bottleneck, e.g. a cable taper or unsuitable connection cable at the battery terminals, can prevent sufficient current from reaching the consumer.
    A clean earth contact must also always be ensured to prevent undervoltage at the consumers.
  • Low temperature charging: As LiFePo4 batteries behave differently depending on the temperature, a warm installation/charging location is preferable for winter camping. Some batteries have a self-heating function. The optimum operating range is 20-40°C. Charging outside this range will affect the maximum number of possible charging cycles.

Note: A general statement on the use of LiFePo4 batteries is not possible due to the variety on the market.
The Truma product portfolio does not include batteries or rechargeable batteries for powering vehicles. However, as the vast majority of our devices are connected to the vehicle electrical system, there is of course a dependency on these.
From previous discussions with customers, we know that there are some uncertainties about LiFePo4 batteries. We have therefore decided to give you our assessment of this.
If in doubt, please always enquire with your dealer and refer to the highlighted first paragraph of this article.

Truma Cooler answer list

Is there any unusual behaviour on your Cooler that you have questions about?
In the overview of the three different categories you will find information and possible remedial measures:
– Observed behaviour
– Error code
– App

Category: Observed behaviour

  1. The set temperature is not reached or the cooling output is too low
    Air circulation may be disturbed
    • Reduce the amount of products in the Truma Cooler or store them in such a way that air can circulate in the space between them
    • Ensure sufficient air supply at the ventilation openings and place the Truma Cooler in a cooler place without direct sunlight
    • Ensure that the cover is properly closed
    • Check the cover seal for damage and replace if necessary
  2. The actual temperature of the Truma Cooler deviates from a separately measured interior temperature
    A temperature measurement with “household thermometers” is not meaningful due to various interfering influences. (e.g. open cover, measurement with laser on a wall, measurement without refrigerated/frozen food).
    • In the event of permanent temperature deviations, switch to OFFSET (press + and – simultaneously and hold for 3 seconds, “A0” is displayed). Use + or – to select the desired number of degrees (up or down by max. 5 °)
  3. The Truma Cooler cannot be switched on
    Error in the power supply
    • Ensure power supply at the appliance input
    • Have the fuse checked by qualified personnel and replaced if necessary
  4. The Truma Cooler does not work below 10 °C
    Malfunctions may occur below 10 °C and under unfavourable ambient conditions
    • Create a higher ambient temperature
  5. Noises
    As with any cooling appliance, noises from the refrigerant and compressor are audible during normal operation.
    Between 15 and a maximum of 30° inclination, the volume of the compressor may increase (without affecting the cooling output).
    • Operate the Truma Cooler on a level surface
  6. Hardware defect of any kind
    In the event of mechanical damage, the spare part can be obtained from a dealer.
    • Selected spare parts are available from 01.01.2024 onwards
    • e.g. cover, corner protection, seal, rubber foot, carrying handle
  7. Display does not work or does not work properly
    Please contact your dealer or Truma Service
    • Operation via the app or with “emergency override” possible as a temporary solution

Category: Error code

  1. Code E0
    Interruption at the temperature sensor (NTC)
    • Short-term: Operation in “emergency override” is possible
    • Long-term: Contact your dealer or Truma Service
  2. Code E1
    Battery low charge protection has triggered due to undervoltage.
    LO: 10.1 or 21.5 V
    MED: 11.4 or 24.1 V
    HI: 11.8 or 24.6 V
    • Adapt the battery low charge protection to the current use
    • (see operating instructions)
    • Ensure supply voltage at the device input
  3. Code E3 in normal operation
    Can occur with voltage change 230V/12V
    • Disconnect Truma Cooler from the supply voltage, wait 10 minutes and switch on again
  4. Code E3 in “emergency override” mode
    Automatic switch-off after 8 hours
    • Disconnect the Truma Cooler from the supply voltage, wait 10 minutes and switch on again
  5. Pulsating display “000” – Cooler does not start
    Error in the power supply
    • Ensure power supply at the device input

Category: App

  1. No connection of the Truma Cooler with the app possible
    Note: in “CLO” mode, pairing is only possible by scanning the QR code.
    • The Truma Cooler can only be paired with one App or mobile device at a time.
    • Ensure that the Truma Cooler is switched on and the Bluetooth function is activated on both devices
    • Remove the Truma Cooler from the mobile device and restart the device search
    • Update the Truma Cooler App or uninstall the current version of the App and download the App again