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

2G switch-off in Switzerland – consequences for the iNet Box

Hello all,

now it is implemented. Switzerland has switched off the 2G network on 01.01.2023. For iNet Box users in Switzerland the following applies:

You can still control and monitor the iNet Box and thus the connected devices via Bluetooth in the near field. The function via the far field via 2G (GSM) is no longer possible.
Outside of Switzerland, e.g. on holiday in Italy, the GSM function is still available.

As you have surely followed, we have been informing about this topic for several years –> Service blog article from August 2020

Here are the answers to the questions that arise:

What is 2G and why is it being switched off?
The term 2G refers to the GSM network. In other words, the network that is used to send a classic text message. You have certainly come across the names of the other networks before. For example, 3G corresponds to “UMTS” and 4G to “LTE”.

The 5G expansion is in full swing. This new, even faster network needs space. Therefore, one of the networks used so far will have to be shut down.

Are other countries besides Switzerland affected by this?
Some European countries are planning to gradually shut down the 2G network. Liechtenstein is one of the next.
However, since many systems in use are dependent on precisely this 2G network, the other European countries will continue to support this network.
In Germany and Austria, the 3G network is therefore being switched off to make room for 5G. 2G will remain.
So there will be no restrictions for the iNet Box in the near future.

Is there another Truma product for using a remote control in Switzerland?
Unfortunately not at the moment. As of today, our iNet X system is purely Bluetooth-capable. This enables app control at close range. A module for remote control is planned and we are working on the corresponding implementation and production.
Due to the current situation, we are unfortunately not yet able to give a concrete date. We will inform you as soon as the countdown begins.

Centralisation of enquiry processing

Hello everyone,

From the past, you are used to being able to comment on our articles and thus enter into direct exchange with us.

To ensure that all enquiries can be processed in a high-quality and timely manner, it is important to use a centralised channel for enquiries. We have therefore decided to deactivate the comment function in this service blog for the time being.

You can use our contact form Customer service ( to post enquiries or feedback. Detailed information is requested in advance, e.g. the serial number of the unit. This enables us to process your enquiries even more efficiently and quickly.

We would like to take this opportunity to thank our community for their constant friendly interaction with each other and with us.

Your Truma Team

PS: We will gladly continue to create articles on current topics for you so that you are always up to date.

Fixed: iNet X Pro Panel – Sensor Timeout (E503V, E511V)

Hello dear community,

We have received feedback from you regarding an incorrect display of the water sensors. Thank you for reporting this directly to us.

Only the iNet X Pro Panel with firmware is affected, in connection with an electrical block (EBL) installed in your vehicle.

The idea of the panel is to centrally map and monitor the most important vehicle functions and status displays. Our panel uses data that it receives from the EBL. The two timeout errors mentioned are missing information from the fresh and grey water sensors. There is therefore delayed communication between the panel and the EBL.

To fix this issue, we ask you to install panel release with version

This update is available via the Truma iNet X App, starting from v 1.5.1.

Thank you.

Fit for the start of the season

Finally the time has come. The seasonal number plates take effect. You can bring your vehicle out of winter storage or even finally inaugurate your brand new vehicle.

The best thing to do is to check all the installed equipment in good time, so you can prevent delays to your journey.

We show you which points to pay attention to so that the much-deserved start of your journey goes really smoothly.

Truma appliances:

  • Replace the air-conditioning filters (if fitted).
  • Start up the air conditioner for test purposes (if necessary, heat up the interior first, at least 18 – 20 °C).
  • Clean the installation space of the heater and the unit itself (vacuum, wipe carefully if necessary).
  • Check all water connections and devices for leaks (fittings, combi, therme, boiler).
  • Check whether the networked systems still have a connection (app, iNet Box, LevelControl, etc.).
  • Make a Mover test run. Does the swivelling on/off and the movement work?

What to do if a malfunction occurs?

  • Find out from reputable sources if there are measures you can take yourself. Feel free to do so via this blog, as well as our homepage and YouTube channel.
  • Contact your dealer or one of our service partners. These can be identified by the tool icon in the dealer search.
  • Contact Truma Service directly.
  • Allow sufficient reaction time to be able to rectify a fault.

What if you want to buy additional accessories or a spare part?

  • With the exception of the coolers, Truma does not offer its own shop.
  • Therefore, contact your dealer or one of our authorised dealers. These can be recognised by the Truma icon.

Entire vehicle:

  • Put the entire gas system into operation. Are the cooker, fridge, etc. working?
  • Clean the water system, i.e. the fresh water tank and all appliances with a water tank. We recommend using citric acid for this purpose.
  • – Make sure the battery is in order and fully charged (12V power supply).
  • Checks tyre pressure and condition
  • Look at the vehicle as a whole (lighting, validity HU)

Truma – the original

Camping is on everyone’s lips, the industry is booming.
The demand is high, the supply is growing.

Unfortunately, the money that can supposedly be made quickly has led to a number of black sheep jumping on the bandwagon, in addition to many qualified dealers.

Free riders sell products under our name that are not original Truma products.

We will therefore show you today how you can recognize original Truma devices.

  • the type plate: each of our products is provided with a type plate at the factory. In addition to information about the device, you will also find the manufacturer’s details and legal identifiers (e.g. CE):
  • the Truma logo: 70 years of company history is also symbolized by our Truma company logo. This can be found on each of our devices. Sometimes printed, sometimes glued on. But always easily recognizable.
  • Our outstanding service: For Truma original products, you receive a manufacturer’s warranty of 24 months in addition to the statutory warranty. In addition to our service partner network, we offer telephone support and mobile service technicians throughout Germany.
  • quality: Truma stands for quality and reliability, for transparency and information. Our official homepage is maintained with a lot of information for you. Product information, product pictures and contact details for us and our dealers and service partners can be found there.

Please feel free to contact us if you have any questions or uncertainties.

Truma iNet X System – What you always wanted to know

We would like to inform you transparently about the new system solution and offer a platform for exchange as well as answer questions for the community in the long term.

You can find the basic product information at

There will be two different panels, a retrofit solution for you as the end customer, the Truma iNet X Panel and the Truma iNet X Pro Panel, which will be installed in new vehicles directly by the vehicle manufacturer before delivery

Both systems were presented at the Caravan Salon in Düsseldorf, so you have already been able to gather your first impressions.

The Truma iNet X retrofit panel will be available in stores in spring 2022.

The panels communicate at close range via Bluetooth. With our Truma iNet X App, you can therefore use the full scope (varies depending on the vehicle equipment). A far-field module, for communication outside the close range, will be introduced in future as well.

If you have feature requests or ideas, then you can actively help shape the range of functions. To do so, please take part in our Open Innovation
Your wishes and ideas are collected centrally via this channel, evaluated and incorporated into the project.

If you simply have questions about the iNet X system, feel free to use the comment function on this blog post.

We look forward to exchanging ideas with you.

Peculiarities of gas cylinders in connection with the LevelControl

The LevelControl measures the cylinder level via ultrasound. For this, it is necessary that the coupling pad of the device has clean contact with the bottom of the gas cylinder.

Suitable are upright (propane / butane – LPG) steel or aluminium gas cylinders with a diameter of 200 to 350 mm.

Depending on the cylinder type and age, there may be different obstacles to clean measurement.

Here are some examples of obstacles and the corresponding solutions:

Bottle heavily rusted/dirty

Due to the uneven surfaces caused by rust, the ultrasonic signal can no longer penetrate cleanly into the bottle. A measurement is therefore not possible.

In this case, it is recommended to mount the LevelControl in such a way that the coupling pad rests on a surface that is as smooth as possible. In severe cases, the only solution is to replace the bottle.

Bottle stand base too narrow

On such a bottle, the LevelControl has no place underneath. The bottle rests with its entire weight on the LevelControl and squeezes the coupling cushion. This also means that no measurement is possible.

The supplied feet or other distance blocks can provide a remedy.

Bottle base dented/flattened on the underside

If the LevelControl is attached to the centre of such bottles, the coupling pad no longer rests on the ground as desired. A measurement is therefore not possible at this point.

In this case, simply move the LevelControl a little out of the centre.

Tank bottles/gas tanks

Tank bottles have a special interior that enables refuelling (fuel indicator, etc.). This interior deflects the ultrasonic signal of the LevelControl so that no measurement result can be calculated and displayed.

The LevelControl cannot be used on such bottles/tanks.

Thanks to the customers who sent us the photos for better clarification.

Reset function on the CPplus

The spanner in the lower right-hand area of the display is used to access the settings menu of the CPplus operating element. And it is here that you will find the menu item “Reset”. However, many people are unfamiliar with its function.

When the CPplus is delivered, it is completely blank with regard to the units to be controlled. The device memory is empty. During the vehicle conversion at the caravan or motor home manufacturer, the vehicle technology is implemented step by step into the body and at some point the gas supply and heating and air conditioning system from our company is also installed. In order to be able to operate and monitor all Truma devices, the device memory in the CPplus must finally be filled. And this is what the reset function is for. By pressing the control knob when “RESET” is shown on the display, I activate this function and “PRSET” appears. Press the control knob again to delete the unit’s memory. After this, “INIT” appears; all units connected to the CPplus with a TIN cable and supplied with voltage at the time of initialisation are now written into the unit memory of the CPplus. Only at this point can they be controlled with the operating element. All symbols belonging to the units are then stored on the display and can be selected.

Please note that a reset is never used to reset an error code. If, for example, the heater reports a gas error ( E506H, E516H or E517H), the reset automatically locks the control electronics of the heater for 15 minutes. If a reset is activated with the warning message W255H, which indicates that the control element has lost contact with the heater, then the CPplus is returned to the delivery state without a connected heater. In this case, the power supply of the heater and the TIN connection cable to the heater should be checked first.