Energy for your Caravan

There are three different types of batteries for caravans: a starter battery is installed to get the engine running, and the on-board battery is used to power the lighting, the refrigerator and the radio. Dual batteries are designed for both tasks. With us, you will find the right battery for your requirements and we will advise you on the appropriate charging technology.

More info about the battery types
Frequently asked questions

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Supply batteries for your caravan

Supply or consumer batteries were developed for the reliable power supply of electrical consumers in motorhomes and caravans.
There are different types with different advantages:

AGM technology

  • fast charging time
  • high currents can be drawn
  • suitable for solar applications
  • best choice in combination with inverter
  • cold-resistant and also suitable for winter campers
  • Maintenance-free, vibration-proof & installation independent of position

Gel technology

  • long shelf life
  • long-life and resistant to high temperatures
  • High depth of discharge and cycle resistant
  • Maintenance-free, vibration-proof & installation independent of position


  • When choosing your charger, make sure that it is designated for gel and/or AGM batteries
  • The depth of discharge should not exceed 50%
  • How to calculate the approximate capacity (Ah) required for your battery system - see example
  • Consumer batteries for your caravan

    These batteries are also called traction or semi-traction batteries and can be used when a constant power supply is needed over a longer period of time. They can be used when a constant power supply is needed over a longer period of time. This is the case, for example, with electric motors. Due to their low self-discharge, they are also particularly suitable for storing solar energy.

    SEM technology

    • especially low self-discharge
    • designed for many charge and discharge cycles
    • suitable for low power consumption
    • low-cost battery variant
    • Low maintenance due to simple acid regulation


  • Select a battery capacity that is large enough so that connected wind generators or solar panels also supply the necessary charging current to be able to fully charge the batteries.
  • Watch out when comparing batteries!
    Meaning of the indications C10 or C20 on the battery type plates: The number after the C indicates the time (always in h) in which the corresponding capacity (Ah value) is dischargeable. Example: 100Ah (C20) 100 Ah / 20 h = 5 A (Ampere) this means, if the battery would be loaded with 5 A, it would be discharged in 20 hours.
  • Dual batteries for your caravan

    Dual batteries are starting and supply batteries and are used when only one battery is installed in the motorhome. They provide power both for starting the engine and for supplying the electronic devices on board. The technology of these all-rounders is designed for universal use.It is not about maximum power.

    These combination types are available with maintenance-free AGM technology and as a wet version at a more economical level.

    AGM technology

    • Developed for demanding motorhomes
    • extremely durable
    • shock and vibration resistant


  • If the vehicle allows two batteries, it is recommended to use a car battery for starting and a supply battery for the electrical devices.
  • Old batteries can be disposed of professionally and certified by us! More information on this
  • The right charger for your vehicle

    While driving, the on-board batteries are charged by the engine's alternator. However, an optimal full charge is usually only achieved via a charger. For this reason, every opportunity for charging should be used.

    Wind generators and solar panels are usually only used for supplementary charging, i.e. a charger is necessary to optimally charge the batteries and thereby maximise their service life. We are happy to help with the selection of a suitable charger.



  • When choosing your charger, make sure that the corresponding technology of the battery (AGM, Gel or Lithium) is shown.
  • Charge booster

    Charge boosters (also called charge converters) provide energy for charging supply batteries even while driving or serve as jump-starting devices.

    Battery management

    The Noco Genius battery status indicators track the battery's state of charge. The LED display shows the state of charge in 25% increments.

    Battery supplies for caravan

    Are you interested in battery supplies?
    We offer innovative chargers, charge boosters, inverters and much more from Victron Energy.

    More about Victron

    Our top selection of brands

    • Marke Victron Energy
    • brand exide technologies
    • brand ctek maximizing battery perfomance
    • brand q-batteries
    • brand odyssey battery
    • brand noco genius
    • brand trojan battery company
    • brand optima batteries
    • brand banner
    • brand Varta

    You have questions about caravans?

    Here you will find a summary of the general questions and answers for caravans and motorhomes.
    If we have not answered your questions, please contact us by e-mail or telephone.
    We will be happy to help you. 37676-0


    Can I also replace the on-board battery with several starter batteries?

    The use of a starter battery is generally not recommended. Starter batteries are designed for short-term power output in order to be recharged immediately after starting the combustion engine.

    On-board batteries are designed for cyclic loading. They can deliver relatively low currents over a longer period of time.

    Is it worth switching to gel or AGM batteries?

    If you are currently using a liquid battery and are considering a switch because of the maintenance-free, non-gassing, longer service life and higher capacity, you should first clarify whether the existing charger is also suitable for AGM or gel batteries. At the same time, one should keep the operating conditions in mind.

    If you only use your onboard batteries a little, you will probably be able to get by with the inexpensive liquid version. On the other hand, those who plan to load their batteries more cyclically and assume a high power demand will not be able to avoid a conversion in the long term.

    How big do my batteries need to be?

    Lead-acid batterieslast a very long time if they are always full as often as possible and are deeply discharged as little as possible. The following standard errors occur again and again in practice:

    The batteries are chosen so large that the charger, wind generator or solar panels do not provide the necessary charging current to fully charge the batteries. This damages the batteries in the long term. The capacity decreases. The remedy is a charger that is designed for the battery capacity.
    The batteries are chosen too small. The refrigerator or the daily TV programme draws so much current from the on-board batteries that a deep discharge occurs and the batteries are damaged as a result. In this example, an increase in battery capacity is necessary. Please consult us or your caravan / marine specialist before investing. The following sample calculation can be used to roughly determine the necessary capacity (Ah) of your battery system:

    (power 60 watts (W)) / (voltage 12 volts (V)) = amperage 5 amps (A) * duration of use / day in hours (h), e.g. 10 h = required capacity in ampere hours (Ah) 50Ah

    Through this calculation, one can calculate the consumer individually and by adding it up, find the total capacity needed. Since the usable capacity is not equal to the specified capacity, the calculated capacity must be multiplied by a factor depending on the battery type.

    In this case, we suggest the following factors:
    50Ah * factor liquid battery 1.7 = 85Ah
    50Ah * factor AGM / Gel battery 1.4 = 70Ah